73 results on '"Marmier N"'
Search Results
2. Interaction of europium and nickel with calcite studied by Rutherford Backscattering Spectrometry and Time-Resolved Laser Fluorescence Spectroscopy
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Sabau, A., Pipon, Y., Toulhoat, N., Lomenech, C., Jordan, N., Moncoffre, N., Barkleit, A., Marmier, N., Brendler, V., Surblé, S., and Giffaut, E.
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- 2014
- Full Text
- View/download PDF
3. Sorption of europium on a MX-80 bentonite sample: experimental and modelling results
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Hurel, C. and Marmier, N.
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- 2010
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- View/download PDF
4. Sorption of Cs and Rb on purified and crude MX-80 bentonite in various electrolytes
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Hurel, C., Marmier, N., Bourg, A. C. M., and Fromage, F.
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- 2009
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5. Stratigraphic Forward Modelling in Albert Lake as a Tool for an Integrated Understanding of Basin Sedimentary Infilling
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Miguel, G. San, primary, Vilasi-Marmier, N., additional, Bez, M., additional, Veillard, S., additional, Buratti, N., additional, Rousseau, M., additional, Ahmed, A., additional, Stankoff, M., additional, and Rubino, J.L., additional
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- 2021
- Full Text
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6. Behavior of nickel at the surface of an Alpine sediment. Influence of organic matter
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Culemme, N, primary, Marmier, N, additional, and Hurel, C, additional
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- 2007
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7. Influence of dissolved silicic acid on the sorption of cations on oxides
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Marmier, N, primary and Hurel, C, additional
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- 2007
- Full Text
- View/download PDF
8. Cesium and Lead Uptake by CSH Phases of Hydrated Cement
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Pointeau, I., Marmier, N., Fromage, F., Fedoroff, M., and Giffaut, E.
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- 2000
- Full Text
- View/download PDF
9. Biotreatment for in-situ dredging of sediments from the Golfe Juan marina: results of microcosms experiments
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Battaglia-Brunet, Fabienne, Joulian, Catherine, Dos Santos, Jean-Philippe, Marmier, N, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Ecosystèmes Côtiers Marins et Réponses aux Stress (ECOMERS), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA), Convention Université de Nice Sophia Antipolis, Deltares BRGM, and Université de Nice Sophia Antipolis / Biodragage
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sediment ,pollutants ,dredging ,[INFO.INFO-BT]Computer Science [cs]/Biotechnology ,biodegradation ,organic matter - Abstract
International audience; Inoculation of selected bacterial strains in aquatic sediment in order to decrease their volume and organic matter content has been proposed as an alternative to classical dredging. Whereas increasingly applied, this type of in-situ biotreatment was not entirely studied in terms of environmental impacts, such as influence on biodiversity and possible mobilization of pollutants from the solids to the water phase. In parallel to an experimental in-situ operation for the treatment of sediments from the Golfe Juan marina, microcosm experiments were performed at laboratory scale in order to monitor the evolution of bacterial biodiversity in the sediment and pollutants concentration in the water phase after addition of a commercial inoculum to the sediment. Experiments in flasks showed that the rate of mineralization of the organic carbon, initially present in the sediment, increases with the quantity of added inoculum, and that the effect of added bacteria on the CO 2 production is still significant after 80 days for the highest inoculum dose. The inoculum seemed to stimulate metabolisms involving both oxygen and ferric iron as electron acceptors. Column experiments showed a limited increase (maximum 20%) of As, Cu and Zn concentrations in the water column after the addition of inoculum. The concentrations decreased down to the initial value 60 days after inoculation. The structure of the sediment bacterial community showed only slight changes, suggesting that the inoculated bacteria did not become major microbial components of the sediment microflora.
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- 2017
10. Modeling of Radionuclides Sorption on Bentonite by Using Single Oxides Surface Complexation Models
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Marmier, N., Delisée, A., Fromage, F., and Giffaut, E.
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- 1997
- Full Text
- View/download PDF
11. Biogeochemistry of arsenic in marina sediments
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Battaglia-Brunet, Fabienne, Joulian, Catherine, Guezennec, Anne-Gwenaëlle, Bataillard, Philippe, Seby, Fabienne, Hurel, Charlotte, Mamindy-Pajany, Yannick, Marmier, N., Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Ultra Traces Analyses Aquitaine (UT2A), Ultra Traces Analyses Aquitaine, Géographie de l'environnement (GEODE), Université Toulouse - Jean Jaurès (UT2J)-Centre National de la Recherche Scientifique (CNRS), Ecosystèmes Côtiers Marins et Réponses aux Stress (ECOMERS), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA), Université Nice Sophia Antipolis - Faculté des Sciences (UNS UFR Sciences), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), ANR, ASEDMAR, and ANR-08-CESA-0003,ASEDMAR,Arsenic dans les sédiments marins: Modélisation couplée biogéochimie-biodisponibilité-ecotoxicologie(2008)
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biogéochimie ,transfert ,[SDV.BIO]Life Sciences [q-bio]/Biotechnology ,arsenic ,sédiment marins ,[INFO.INFO-BT]Computer Science [cs]/Biotechnology ,bactéries - Abstract
The management of polluted sediments is problematic because to date no economically suitable process allows the complete and durable stabilization of pollutants. Some marine sediment contains arsenic at concentrations far higher than the limit that imposes a specific treatment to reduce their toxicity. The aim of ASEDMAR project (ANR-2008-CESA-003) was to quantify the phenomena of retention/mobilization of As by the marine compartments in marine sediments, in order to describe the link between their biogeochemical state, direct toxicity and ability to transfer As to the water column. Sediments were sampled in two French Mediterranean marinas. The project highlighted the importance of biogeochemistry on the behavior of arsenic and its mobility between the following different compartments: solid sediment, pore water and overlying water column. Initial characterization of the sediments revealed the occurrence of thio-arsenic species, probably related to the activity of sulfate-reducing bacteria. Diversity of bacteria directly involved in arsenic cycle was examined through the use of specific molecular tools based on the functional genes aoxB (AsIII oxidation) and arrA (AsV respiration). As we developed the DGGE fingerprinting technique on aoxB genes, the aoxB-carrying community was studied in more details. Altogether, our results showed a very active bacterial community against As in the marine sediments, where AsIII oxidizers and AsV reducers co-exist at both locations. Sediment microcosms were incubated in conditions that stimulated some bacterial processes potentially involved in arsenic mobility. Column experiments were performed in order to ob-serve at the laboratory level the effects of a punctual suspension event, for example linked to a dredging operation. Column experiments allowed studying arsenic distribution in interstitial water, at the interface and in the water column. The following events were observed: settling and deposit (0-7 days), settling, deposit and beginning of consolidation (7-20 days), consolidation (20-60 days), and stabilized sediment after 60 days. The total arsenic concentration was very low just after the re-suspension event that introduced oxygen into the sediment. Arsenic may have been oxidized and ad-sorbed on solid phases such as freshly formed iron oxides. Then, arsenic concentration increased in in-terstitial water and just above the interface, reaching several hundred µg/L. This phase was followed by a decrease of As concentration that however remained relatively high (100 µg/L) up to the end of the monitoring (150 days). All results suggest that along the settling, deposit and consolidation of the sediment, the progressive return to anaerobic conditions favored a succession of biogeochemical reactions linked to cycles of carbon, iron, manganese, nitrogen and sulfur characterized that induced flushes of iron, manganese and arsenic from the solid to the liquid phase. After the stabilization of sediment, a permanent system established in the columns accompanied by a continuous flux of arsenic toward the water column, that has continued for many months after the suspension event. A model was built of distinct blocks which calculate arsenic concentration and its evolution in the "sediment" following changes in physico-chemical and biological parameters. The overall results confirm the major influence of microbiological activities on the fate of pollutants. Those phenomena have to be considered when evaluating the impact of sediments management, both ex-situ and in-situ.
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- 2014
12. Incorporation of Europium and Nickel in calcite studied by Rutherford Backscattering Spectrometry
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Toulhoat, N., Pipon, Y., Moncoffre, N., Sabau, A., Lomenech, C., Jordan, N., Barkleit, A., Marmier, N., Brendler, V., Surblé, S., and Giffaut, E.
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Ni ,incorporation ,Eu ,calcite ,RBS - Abstract
This study aims at elucidating the mechanisms leading to the incorporation of cations (Eu and Ni) into carbonates (CaCO3). These minerals are present in the French Callovo Oxfordian shales where the radioactive waste should be disposed of. Europium is a long lived fission product that can also be used as analogue of trivalent actinides. Nickel is a long lived activation product. Therefore, for safety reasons, the evaluation of the retention capabilities of calcite with respect to these radionuclides has to be checked. Calcite powders or calcite single crystals (some mm sized) have been put into contact with inactive Europium or Nickel enriched solutions. The concentrations ranged from 10-3 to 10-5 mol/L for Eu and 10-3 mol/L for Ni and the sorption durations ranged from one week to one month. In order to elucidate the incorporation mechanisms of these elements on calcite, Rutherford Backscattering Spectrometry (RBS) experiments have been carried out using an alpha particle millibeam at the 4 MV Van de Graaff accelerator of IPNL. This technique is well adapted to discriminate incorporation processes such as: (i) adsorption or co precipitation at the mineral surfaces or, (ii) incorporation into the mineral structure (through diffusion for instance). For the single crystals, complementary Scanning Electron Microscopy (SEM) observations of the mineral surfaces at low voltage have also been carried out. Moreover, for Europium incorporation, using its fluorescence properties, the results have been compared to those obtained by Time-resolved laser fluorescence spectroscopy (TRLFS). Results on single crystals show different sorption behavior for Ni and Eu. Ni accumulates at the calcite surface whereas Eu is also incorporated at a greater depth. Eu seems therefore to be incorporated into two different states in calcite: (i) heterogeneous surface accumulation and (ii) incorporation at depth greater than 160 nm after 1 month of sorption.
- Published
- 2013
13. Incorporation of europium and nickel in calcite studied by Rutherford backsattering and spectrometry
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Toulhoat, N., Pipon, Y., Moncoffre, N., Sabau, A., Lomenech, C., Jordan, N., Bartleit, A., Marmier, N., Brendler, V., Surblé, S., Giffaut, E., Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), ACE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Université Nice Sophia Antipolis - Faculté des Sciences (UNS UFR Sciences), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université Nice Sophia Antipolis (1965 - 2019) (UNS), and Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)
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[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,[CHIM.RADIO]Chemical Sciences/Radiochemistry - Abstract
in Press; International audience
- Published
- 2013
14. Study of Europium and Nickel interaction with calcite - batch experiments and spectroscopic characterization
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Sabău, A., Jordan, N., Lomenech, C., Marmier, N., Brendler, V., Barkleit, A., Surblé, S., Toulhoat, N., Pipon, Y., Moncoffre, N., and Giffaut, E.
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Europium ,Nickel ,diffusion ,TRLFS ,incorporation ,calcite ,RBS - Abstract
Interactions between cations and natural or synthetic calcite may include incorporation processes, resulting in the irreversibility of some sorption reactions. Calcite is present in soil and sediment materials, and in particular in the Callovo-Oxfordian clay samples from of the French underground laboratory of Bure (France), studied in the context of an underground repository for radioactive waste. Europium has been chosen to be investigated by TRLFS due to its fluorescent properties and because it can serve as an analogue for trivalent actinides. Nickel is toxic as a heavy metal as well as in its radioactive form. Few experimental studies have been made to define its interaction with soil and sediment minerals in general and only a handful of articles report investigations of Ni interaction with calcite. To investigate these irreversible processes, we have chosen to work on the Eu-CO2-NaCl-CaCO3 and Ni-CO2-NaCl-CaCO3 systems at pH 8.4, buffered by calcite under atmospheric conditions. Our study combines macroscopic batch experiments with spectroscopic investigations (Time Resolved Laser Fluorescence Spectroscopy - TRLFS and Rutherford Backscattering Spectrometry - RBS) to comprehensively characterize these systems. First, appropriate material for sorption experiments were selected based on characterization studies. Eventually, a calcite powder from SOLVAY (SOCAL U1-R) with a particle size of 0.2 μm for TRLFS investigations was chosen, mainly due to its large BET specific surface area (i.e. 18.4 m2/g). In addition, a calcite powder from OMYA (BL 200), with a bigger particle size (56 μm) and a lower specific surface area (0.7 m2/g) was used for Rutherford Backscattering Spectrometry (RBS) measurements, due to the specific requirements of this technique. For both powders, Diffuse Reflectance Infra-Red Fourier Transform Spectroscopy (DRIFT), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and elementary analysis confirmed the absence of polymorphic CaCO3 compounds (i.e. vaterite and aragonite). In order to get a better understanding of incorporation of cations in the structure of calcite, we compared our results obtained on powders with studies on millimetric calcite single crystals from Alfa Aesar, performed under the same experimental conditions as for powders. The sample preparation consists in open reactor experiments under atmospheric conditions (pCO2 = 10-3.5 atm) in 0.1 M NaCl media. The studied concentrations range from 10-6 to 10-3 M. The experiments were carried out for contact times ranging from 4 hours to 6 months for europium and from 4 hours up to 3 months for nickel. For europium, ICP-AES/ICP-MS analysis of the supernatants showed a strong retention by calcite whatever the initial concentration, contrary to nickel where the retention is depending on the initial concentration. The second step of the work involved efforts to better understand the time-dependence of Eu and Ni sorption and respective mechanisms. For each concentration of europium investigated by TRLFS, two species are identified and their fluorescence lifetime increases as the initial concentration decreases and time goes on, corresponding to a gradual loss of water molecules surrounding the europium. For higher concentrations, the species identified appear to correspond to a (co-) surface precipitate and possibly an inner-sphere surface complex with two water molecules retained in the hydration sphere. For lower concentrations, the longer lifetimes observed for one of the two species suggest the incorporation of europium in calcite [1,2]. Rutherford Backscattering Spectrometry (RBS) experiments have been carried out using an alpha particle millibeam at the 4MV Van de Graaff accelerator of IPNL and also on nuclear microprobe of CEA-Saclay. This technique is well adapted to discriminate sorption processes such as: (i) adsorption or co precipitation at the mineral surfaces or (ii) incorporation into the mineral structure (through diffusion for instance). The interpretation of the results shows different sorption behaviors for Ni and Eu. Ni accumulates at the calcite surface whereas Eu is also incorporated at a greater depth. Eu seems therefore to be incorporated into two different states in calcite: (i) heterogeneous surface accumulation, which confirms the hypothesis of the surface precipitate, and (ii) incorporation up to depths greater than 160 nm after 1 month of sorption. Complementary Scanning Electron Microscopy (SEM) observations of the mineral surfaces at low voltage have also been carried out, which confirmed the heterogeneities detected by RBS measurements. [1] Fernandes, M. M.; Schmidt, M.; Stumpf, T.; Walther, C.; Bosbach, D.; Klenze, R.; Fanghänel, Th., Journal of Colloid and Interface Science (2008), 321(2), 323-331. [2] Piriou, B; Fedoroff, M.; Jeanjean, J.; Bercis, L., Journal of Colloid and Interface Science (1997), 194, 440-447.
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- 2013
15. Rétention de l’europium par la calcite : de l’adsorption à l’incorporation dans le matériau
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Sabau, A., Lomenech, C., Marmier, N., Jordan, N., Barkleit, A., Brendler, V., Toulhoat, N., Pipon, Y., Moncoffre, N., and Giffaut, E.
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TRLFS ,Eu ,calcite ,RBS - Abstract
Les mécanismes d’interaction entre cations et minéraux peuvent inclure des processus d’adsorption, de (co-)précipitation de surface, et aller jusqu’à l’incorporation au sein du matériau, ce qui peut entraîner l'irréversibilité de certaines réactions de sorption. Le minéral choisi pour cette étude est la calcite, présente dans les argilites du Callovo-Oxfordien et également produit d’altération des ciments sur des échelles géologiques, ce qui justifie son intérêt pour l’évaluation de la sûreté d’un site de stockage de déchets radioactifs en site géologique profond. Le cation étudié est l’europium, en tant qu’analogue de certains actinides. La démarche adoptée est la combinaison de données macroscopiques de rétention avec une étude spectroscopique : SLRT pour tenter d’élucider les mécanismes de sorption, et RBS pour confirmer la précipitation de surface ou l’incorporation au sein du matériau et obtenir les profils de diffusion. Les expériences en réacteur fermé ont été menées sous conditions atmosphériques (pCO2 = 10-3.5 atm) en milieu NaCl 0,1 mol.L-1, pour des concentrations d’europium variant de 10-6 à 10-3 mol.L-1 et des temps de contact variant de quelques heures à 1 mois. Les analyses ICP-AES des surnageants montrent une rétention très forte par la calcite quelles que soient les conditions expérimentales. Les résultats de SLRT montrent un comportement différent de l’europium en fonction de la concentration initiale et du temps de contact. Pour chacune des concentrations, deux espèces sont mises en évidence, leurs temps de vie augmentant lorsque la concentration initiale diminue, et lorsque le temps de contact augmente, ce qui correspond à une perte progressive des molécules d’eau entourant l’europium. Pour les concentrations les plus fortes, les espèces identifiées semblent correspondre à un (co-)précipité de surface et un complexe de surface ayant conservé deux molécules d’eau en sphère interne. Les mesures RBS effectuées pour ces concentrations, montrent une accumulation de l’europium à la surface de l’échantillon, ce qui confirme l’hypothèse du précipité de surface. Pour les concentrations plus faibles, les temps de vie observés sur l’une des espèces, beaucoup plus longs, et proches de ceux obtenus par Fernandes et al. [1] qui ont effectué des synthèses directes par coprécipitation, semblent indiquer une incorporation de l´europium au sein du matériau.
- Published
- 2012
16. Nanoscale TiO2 particles: relationship between surface properties and toxicity measurements
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Hurel, C., Clement, L., Jordan, N., Weiß, S., and Marmier, N.
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TiO2 ,toxicity ,nanoparticles - Abstract
Titanium oxides nanoparticles have been widely used in industrial applications such as cosmetics, food industries, environment, paints and surface coatings…Face to their growing use in various domains and the difficulties to separate them from the aqueous phase during wastewaters treatment due to their nanometric size, one can expect that the final host for these particles should be environmental compartments (soil, air and water). Nanometric-sized particles are known to cause pulmonary damages and to be toxic for mammals (mice, rats). Nevertheless, few studies dealt with the toxic impact of nanoparticles with ecosystems. Previous studies have shown that the toxic effect was dependent (i) on the size of the particles and (ii) on the allotropic form of TiO2 (anatase or rutile). But a lack of information remains concerning the relationship between the surface properties of TiO2 nanoparticles (surface site density, surface charge) and the observed toxicity. In this study we were interested in anatase (15 nm, 32 nm, 44 μm) and rutile (1 μm) commercial particles. Their toxic effect (acute or chronic) versus microcrustaceans, algae and plants was measured and compared to the particles size. Surface properties of each TiO2 particles were determined by acid-base titration, and electrokinetics measurements, in order to complete data concerning the relationship between nanoparticles toxicity, size and allotropic form.
- Published
- 2012
17. Interaction between europium and calcite: macroscopic and spectroscopic studies
- Author
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Sabău, A., Marmier, N., Jordan, N., Lomenech, C., Barkleit, A., Toulhoat, N., Pipon, Y., Moncoffre, N., Brendler, V., and Giffaut, E.
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sorption ,TRLFS ,incorporation ,europium ,calcite ,RBS - Abstract
Interactions between cations and natural or synthetic calcite may include incorporation processes, resulting in the irreversibility of some sorption reactions. Understanding and quantification of poorly to non reversible trapping mechanisms can be considered as a significant improvement in the description of a geological barrier or a backfill material performance in the safety assessment. To investigate these irreversible processes, we have decided to work on the Eu-CO2-NaCl-CaCO3 system at pH 8.3, buffered by calcite under air and corresponding to the typical pH range of natural interstitial groundwaters. Europium was chosen as analogue for trivalent actinides and due to its fluorescence properties enabling its study by time-resolved laser-induced fluorescence spectroscopy (TRLFS). Our study combines macroscopic batch investigations and the use of spectroscopic tools to comprehensively characterize this system. At first, a material appropriate for sorption experiments had to be selected, based on characterization studies. From a variety of sources, we focused on a calcite from SOLVAY (SOCAL U1-R) with a particle size of 0.2 µm for TRLFS investigations, mainly due to its large BET specific surface area (18.4 m2/g). We also used a calcite from OMYA (BL 200), with a bigger particle size (56 µm) and a lower specific surface area (0.66 m2/g) for Rutherford Backscattering Spectrometry (RBS) measurements, due to the specific requirements of this technique. Purity of the calcite samples and absence of polymorphic CaCO3 compounds (i.e. vaterite and aragonite) were confirmed by XRD, DRIFT or SEM. The second step of the work was to investigate the irreversible Eu(III) uptake mechanisms onto calcite. Batch experiments, done under atmospheric conditions (pCO2 = 10−3.5), were performed under different element concentration (10−5, 10−4 and 10−3 M) and contact time (4 hours, 1 day, 1 week and 1 month), which are assumed to be the most important parameters controlling the transition between adsorption and incorporation into the solid. In addition, this allowed to monitor the potential changes in mechanisms with time. The concentrations of Eu and Ca left in the supernatant were determined by ICP-MS and ICP-OES, respectively. Europium species formed in solution and at the solid/solution interface were identified by TRLFS. Reference blank (Eu3+ in solution and Eu3+ precipitated) spectra were compared with the sorbed samples. When elements such as europium are sorbed onto a mineral surface by inner-sphere complexation, some of the H2O molecules in the first coordination sphere are displaced. Such changes should impact the fluorescence lifetime of Eu species. The spectrum presented in Fig. 1 corresponds to Eu-reacted calcite after a contact time of 1 month and an initial concentration of Eu of 10-4 M. Europium was found to be completely sorbed onto calcite, whose dissolution was negligible. Two lifetimes were identified. The lower value, so far not reported in the literature, can thus not unambiguously be attributed to a specific Eu species. However, the higher second lifetime is correlated with the complete loss of the europium hydration sphere, suggesting either a surface precipitate or an incorporation. RBS measurements (Fig. 2) were carried out using the 4 MV Van De Graaff accelerator facility of IPNL with a 4 MeV incident alpha beam. They were performed at the same Eu concentration as the TRLFS results (Fig. 1), in order to obtain a high resolution signal. RBS results confirmed those obtained by TRLFS, by showing an accumulation of europium onto the calcite surface. It can be concluded that TRLFS and RBS are appropriate and complementary techniques to study the Eu-CO2-NaCl-CaCO3 system. The results obtained so far indicate that there is either a surface precipitate following a first sorption step or that incorporation into the bulk crystal lattice already started. Both processes may occur simultaneously, further experiments shall reveal this.
- Published
- 2012
18. Thermodynamics of proton binding at the alumina-water interface revisited
- Author
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Morel, Jean-Pierre, Marmier, N., Hurel, C., Morel-Desrosiers, Nicole, Thermodynamique des solutions et des polymères (TSP), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), and Morel-Desrosiers, Nicole
- Published
- 2005
19. Adsorption of nickel and arsenic from aqueous solution on natural sepiolite
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Alex, S. Ansanay, primary, Lomenech, C., additional, Hurel, C., additional, and Marmier, N., additional
- Published
- 2012
- Full Text
- View/download PDF
20. Minerals as additives for decreasing the toxicity of Mediterranean contaminated dredged sediments
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Mamindy-Pajany, Y., primary, Galgani, F., additional, Roméo, M., additional, Hurel, C., additional, and Marmier, N., additional
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- 2010
- Full Text
- View/download PDF
21. Sorption of Cs and Rb on purified and crude MX-80 bentonite in various electrolytes
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Hurel, C., primary, Marmier, N., additional, Bourg, A. C. M., additional, and Fromage, F., additional
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- 2008
- Full Text
- View/download PDF
22. Sorption behaviour of caesium on a bentonite sample
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Hurel, C., primary, Marmier, N., additional, Sèby, F., additional, Giffaut, E., additional, Bourg, A. C. M., additional, and Fromage, F., additional
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- 2002
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23. Surface complexation modeling of Yb(III) sorption and desorption on hematite and alumina
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Marmier, N., primary, Dumonceau, J., additional, and Fromage, F., additional
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- 1997
- Full Text
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24. Sorption of Iodine and Cesium on Some Mineral Oxide Colloids
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Hakem, N., primary, Fourest, B., additional, Guillaumont, R., additional, and Marmier, N., additional
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- 1996
- Full Text
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25. Arsenic in marine sediments: Modeling the link between biogeochemistry, bioavailability and ecotoxicology
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Battaglia-Brunet, F., Catherine Joulian, Guezennec, A. -G, Dictor, M. C., Bataillard, P., Marmier, N., Hurel, C., Barats, A., Philippini, V., Mamindy-Pajany, Y., Romeo, M., Bertin, P., Koechler, S., Séby, F., and Moulin, A.
26. Geochemical stabilization of contaminated Mediterranean dredged sediments
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Mamindy-Pajany, Y., Charlotte Hurel, Marmier, N., and Roméo, M.
27. Ecotoxicological evaluation of Mediterranean dredged sediment ports based on elutriates with oyster embryotoxicity tests after composting process
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Annamaria Volpi Ghirardini, Michèle Roméo, Nicolas Marmier, C Losso, Charlotte Hurel, Yannick Mamindy-Pajany, Giovanni Libralato, Ecosystèmes Côtiers Marins et Réponses aux Stress (ECOMERS), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA), Department of Biology, University of Naples Federico II, Université Nice Sophia Antipolis - Faculté de Médecine (UNS UFR Médecine), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Institut de Physique de Nice (INPHYNI), Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), MAMINDY PAJANY, Y., Libralato, Giovanni, Roméo, M., Hurel, C., Losso, C, VOLPI GHIRARDINI, A., and Marmier, N.
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Settore BIO/07 - Ecologia ,0106 biological sciences ,Pollution ,Geologic Sediments ,Oyster ,Embryo, Nonmammalian ,Environmental Engineering ,Settore MED/42 - Igiene Generale e Applicata ,media_common.quotation_subject ,010501 environmental sciences ,engineering.material ,[CHIM.INOR]Chemical Sciences/Inorganic chemistry ,Ecotoxicology ,01 natural sciences ,Soil ,[CHIM.ANAL]Chemical Sciences/Analytical chemistry ,biology.animal ,Toxicity Tests ,Dissolved organic carbon ,Animals ,Seawater ,14. Life underwater ,Waste Management and Disposal ,ComputingMilieux_MISCELLANEOUS ,0105 earth and related environmental sciences ,Water Science and Technology ,Civil and Structural Engineering ,media_common ,EC50 ,Total organic carbon ,biology ,Mediterranean Region ,Compost ,010604 marine biology & hydrobiology ,Ecological Modeling ,Environmental engineering ,Sediment ,[CHIM.MATE]Chemical Sciences/Material chemistry ,Reference Standards ,Ostreidae ,[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry ,Environmental chemistry ,Toxicity ,engineering ,Environmental science ,France ,Filtration ,Water Pollutants, Chemical - Abstract
The ecotoxicological effect of dredged sediments was estimated by embryo-larval toxicity of the oyster Crassosstrea gigas in sediment elutriates (filtered and unfiltered). The study covers the main ports from the French Mediterranean coast. Composted sediments from a navy harbour (A), a commercial port (B) and two composite specimens (C and D) obtained after mixing various sediments were taken into consideration. Effective concentrations affecting 50% of larvae (EC50) were obtained from different elutriate concentrations (from 0 to 100%). Toxicity results obtained from filtered elutriates decreased according to the following gradient: sample A (5.68%), B (20.50%), C (37.60%) and D (47.17%). Chemical concentrations in whole sediments were in agreement with those in elutriates. Among the measured contaminants in elutriates, Cu and Zn resulted as the main contributors to toxicity. Dissolved organic carbon played an important role by exerting a protective effect against the toxicity of dissolved Cu. Toxicity results were interpreted on the basis of toxicity scores to give indication about sediment quality which provided more severe judgement than risk score based on chemical concentrations in sediments.
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- 2010
28. Sediment-bound trace metals in Golfe-Juan Bay, northwestern Mediterranean: Distribution, availability and toxicity.
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Tiquio MGJ, Hurel C, Marmier N, Taneez M, Andral B, Jordan N, and Francour P
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- Animals, Bays, Ecosystem, Environmental Monitoring methods, France, Mediterranean Sea, Metals toxicity, Rotifera drug effects, Trace Elements toxicity, Water Pollutants, Chemical toxicity, Geologic Sediments chemistry, Metals analysis, Trace Elements analysis, Water Pollutants, Chemical analysis
- Abstract
The concentration, potential mobility, cation exchange capacity and toxicity of eight sediment-bound metals in Golfe-Juan Bay, France were examined. Results revealed significant spatial gradient of metal contamination along Golfe-Juan coast. The distribution and concentration of the metals appear to be influenced by the geochemical properties of the sediment, proximity to anthropogenic sources and general water circulation in the bay. The portion of trace metals found in the exchangeable, carbonate, oxidizable and reducible fractions of the sediment constitute 31%-58% of the total sediment-bound trace metal content, suggesting significant potential for remobilization of metals into the water column. Pb and Ni content of the sediment exceed the limits of the French marine sediment quality. Whole sediment extracts showed acute toxicity to marine rotifers. This study concludes that monitoring and management of sediment-bound trace metals in Golfe-Juan Bay are important so as not to underestimate their availability and risk to the marine ecosystems., (Copyright © 2017 Elsevier Ltd. All rights reserved.)
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- 2017
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29. Use of neutralized industrial residue to stabilize trace elements (Cu, Cd, Zn, As, Mo, and Cr) in marine dredged sediment from South-East of France.
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Taneez M, Marmier N, and Hurel C
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- Animals, Calcium Sulfate chemistry, Ferric Compounds chemistry, France, Metals, Heavy chemistry, Metals, Heavy toxicity, Rotifera drug effects, Toxicity Tests, Trace Elements chemistry, Trace Elements toxicity, Water Pollutants, Chemical chemistry, Water Pollutants, Chemical toxicity, Aluminum Oxide chemistry, Geologic Sediments chemistry, Industrial Waste, Metals, Heavy analysis, Trace Elements analysis, Water Pollutants, Chemical analysis
- Abstract
Management of marine dredged sediments polluted with trace elements is prime issue in the French Mediterranean coast. The polluted sediments possess ecological threats to surrounding environment on land disposal. Therefore, stabilization of contaminants in multi-contaminated marine dredged sediment is a promising technique. Present study aimed to assess the effect of gypsum neutralized bauxaline(®) (bauxite residue) to decrease the availability of pollutants and inherent toxicity of marine dredged sediment. Bauxaline(®), (alumia industry waste) contains high content of iron oxide but its high alkalinity makes it not suitable for the stabilization of all trace elements from multi-contaminated dredged sediments. In this study, neutralized bauxaline(®) was prepared by mixing bauxaline(®) with 5% of plaster. Experiments were carried out for 3 months to study the effect of 5% and 20% amendment rate on the availability of Cu, Cd, Zn, As, Mo, and Cr. Trace elements concentration, pH, EC and dissolved organic carbon were measured in all leachates. Toxicity of leachates was assessed against marine rotifers Brachionus plicatilis. The Results showed that both treatments have immobilization capacity against different pollutants. Significant stabilization of contaminants (Cu, Cd, Zn) was achieved with 20% application rate whereas As, Mo, and Cr were slightly stabilized. Toxicity results revealed that leachates collected from treated sediment were less toxic than the control sediment. These results suggest that application of neutralized bauxaline(®) to dredged sediment is an effective approach to manage large quantities of dredged sediments as well as bauxite residue itself., (Copyright © 2016 Elsevier Ltd. All rights reserved.)
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- 2016
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30. Ex-situ evaluation of bauxite residues as amendment for trace elements stabilization in dredged sediment from Mediterranean Sea: A case study.
- Author
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Taneez M, Hurel C, and Marmier N
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- Animals, Anions chemistry, Cations chemistry, Ecotoxicology methods, Mediterranean Sea, Pilot Projects, Rotifera drug effects, Soil, Toxicity Tests, Acute methods, Aluminum Oxide, Geologic Sediments chemistry, Water Pollutants, Chemical chemistry
- Abstract
Stabilization of marine dredged sediments contaminated with multi-elements is a challenging task in choosing the appropriate sorbent and application dosage. The present study investigates the possibility of using bauxite residues (Bauxaline® and Bauxsol) as amendment for the treatment of contaminated sediment. A pilot scale experiment was conducted for three months to stabilize trace elements in composted contaminated sediment sample using 5% by-product amendment. The results showed that after 3months of treatment, cationic trace elements were effectively immobilized but increased leaching of anionic pollutants was observed. Increased leaching of anionic pollutants could be limited by addition of higher quantities of amendments. The total content of available pollutants decreased in stabilized sediments but this treatment has no effect on the classification of waste. The leachates were then evaluated for acute toxicity using estuarine rotifers Brachionus plicatilis. Bauxite residues can be inexpensive choices for the stabilization of cationic pollutants in dredged sediments., (Copyright © 2015 Elsevier Ltd. All rights reserved.)
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- 2015
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31. Direct injection method for HPLC/MS/MS analysis of acrylamide in aqueous solutions: application to adsorption experiments.
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Mnif I, Hurel C, and Marmier N
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- Acrylamide chemistry, Adsorption, Chromatography, High Pressure Liquid methods, Hydrogen-Ion Concentration, Hydrophobic and Hydrophilic Interactions, Kaolin chemistry, Minerals chemistry, Mining, Tandem Mass Spectrometry methods, Water chemistry, Acrylamide analysis
- Abstract
Polyacrylamides are polymers used in many fields and represent the main source of release of the highly toxic acrylamide in the environment. In this work, a simple, rapid, and sensitive analytical method was developed with HPLC/MS/MS and direct injection for acrylamide analysis in water and adsorption samples. AFNOR standards NF T90-210 and NF T90-220 were used for the analytical method validation and uncertainty estimation. Limit of quantification (LOQ) for acrylamide was 1 μg/L, and accuracy was checked at three acrylamide levels (1, 6, and 10 μg/L). Uncertainties were estimated at 34.2, 22, and 12.4 % for acrylamide concentrations at LOQ, 6 μg/L, and 10 μg/L, respectively. Acrylamide adsorption on clays (kaolinite, illite) and sludge was then studied as a function of pH, time, and acrylamide concentrations. Acrylamide adsorption on kaolinite, illite, and sludge was found to be very weak since adsorption percentages were inferior to 10 %, whatever the pH value and the initial acrylamide concentration. The low affinity of acrylamide for clays and sludge is likely due to its hydrophilic property, small size, and charge neutrality.
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- 2015
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32. Batch and column studies of the stabilization of toxic heavy metals in dredged marine sediments by hematite after bioremediation.
- Author
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Mamindy-Pajany Y, Geret F, Hurel C, and Marmier N
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- Bacteria drug effects, Bacteria metabolism, Geologic Sediments, Iron chemistry, Luminescence, Metals, Heavy toxicity, Water Pollutants, Chemical toxicity, Zeolites chemistry, Ferric Compounds chemistry, Metals, Heavy chemistry, Water Pollutants, Chemical chemistry
- Abstract
The management of dredged sediments is an important issue in coastal regions where the marine sediments are highly polluted by metals and organic pollutants. In this paper, mineral-based amendments (hematite, zero-valent iron and zeolite) were used to stabilize metallic pollutants (As, Cd, Cu, Mo, Ni, Pb, and Zn) in a contaminated marine sediment sample. Mineral-based amendments were tested at three application rates (5 %, 10 %, and 15 %) in batch experiments in order to select the best amendment to perform column experiments. Batch tests have shown that hematite was the most efficient amendment to stabilize inorganic pollutants (As, Cd, Cu, Mo, Ni, Pb, and Zn) in the studied sediment. Based on batch tests, hematite was used at one application rate equal to 5 % to conduct column experiments. Column tests confirmed that hematite was able to decrease metal concentrations in leachates from stabilized sediment. The stabilization rates were particularly high for Cd (67 %), Mo (80 %), and Pb (90 %). The Microtox solid phase test showed that hematite could decrease significantly the toxicity of stabilized sediment. Based on batch and column experiments, it emerged that hematite could be a suitable adsorbent to stabilize metals in dredged marine sediment.
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- 2013
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33. Comparison of mineral-based amendments for ex-situ stabilization of trace elements (As, Cd, Cu, Mo, Ni, Zn) in marine dredged sediments: a pilot-scale experiment.
- Author
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Mamindy-Pajany Y, Hurel C, Geret F, Roméo M, and Marmier N
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- Aliivibrio fischeri drug effects, Aliivibrio fischeri metabolism, Arsenic toxicity, Electric Conductivity, Ferric Compounds chemistry, Geologic Sediments, Iron chemistry, Luminescence, Metals, Heavy toxicity, Pilot Projects, Water Pollutants, Chemical toxicity, Zeolites chemistry, Arsenic chemistry, Environmental Restoration and Remediation methods, Metals, Heavy chemistry, Water Pollutants, Chemical chemistry
- Abstract
Trace element pollution of marine dredged sediments is an emerging problem all over the world. Comparing to other wastes, trace elements stabilization is more difficult both due to the wide range of contaminants present in the marine sediments and their inherent physicochemical properties. In this study, a pilot-scale experiment was performed to stabilize As, Cd, Cu, Mo, Ni, and Zn in a multi-contaminated sediment sample using hematite, zero-valent iron and zeolite. Results showed that iron-based amendments were able to reduce the leaching and the bioavailability of trace elements in the sediment sample, while zeolite was unsuitable. Chemical stabilization through iron-based amendments seems to be a promising approach as a low-cost alternative to traditional stabilization methods involving chemical reagents., (Copyright © 2013 Elsevier B.V. All rights reserved.)
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- 2013
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34. Toxicity assessment of silica nanoparticles, functionalised silica nanoparticles, and HASE-grafted silica nanoparticles.
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Clément L, Zenerino A, Hurel C, Amigoni S, Taffin de Givenchy E, Guittard F, and Marmier N
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- Animals, Chlorophyta drug effects, Daphnia drug effects, Diatoms drug effects, Emulsions, Flax drug effects, Microscopy, Electron, Transmission, Molecular Structure, Nanoparticles chemistry, Particle Size, Polymers chemical synthesis, Polymers chemistry, Seeds drug effects, Silicon Dioxide chemical synthesis, Silicon Dioxide chemistry, Surface Properties, Toxicity Tests, Acute, Toxicity Tests, Chronic, Ecotoxicology methods, Nanoparticles toxicity, Polymers toxicity, Silicon Dioxide toxicity
- Abstract
Numerous nanomaterials have recently been developed, and numerous practical applications have been found in water treatment, medicine, cosmetics, and engineering. Associative polymers, such as hydrophobically modified alkali-soluble emulsion (HASE) systems are involved in several applications and have been extensively studied due to their ability to form three-dimensional networked gels. However, the data on the potential environmental effects of this polymers are scarce. The aim of this study is to assess the effect of functionalisation of silica nanoparticles, and coupling of functionalised silica nanoparticles to the associative polymer HASE on their toxicity. Thus, acute and chronic toxicity tests included a modified acute test (72 h) using daphnies, algae, and plants as model organisms. Gradient of toxicity varied with the tested organisms. Our results revealed that the functionalised nanoparticules and NP grafted polymer cause a global decrease in toxicity compared to commercial nanoparticule and HASE polymer., (Copyright © 2013 Elsevier B.V. All rights reserved.)
- Published
- 2013
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35. Arsenic in marine sediments from French Mediterranean ports: geochemical partitioning, bioavailability and ecotoxicology.
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Mamindy-Pajany Y, Hurel C, Géret F, Galgani F, Battaglia-Brunet F, Marmier N, and Roméo M
- Subjects
- Aliivibrio fischeri, Animals, Arsenic toxicity, Crassostrea, Embryo, Nonmammalian drug effects, Environmental Monitoring, France, Mediterranean Sea, Toxicity Tests, Water Pollutants, Chemical toxicity, Arsenic analysis, Geologic Sediments chemistry, Water Pollutants, Chemical analysis
- Abstract
This work investigates arsenic mobility, bioavailability and toxicity in marine port sediments using chemical sequential extraction and laboratory toxicity tests. Sediment samples were collected from two different Mediterranean ports, one highly polluted with arsenic and other inorganic and organic pollutants (Estaque port (EST)), and the other one, less polluted, with a low arsenic content (Saint Mandrier port (SM)). Arsenic distribution in the solid phase was studied using a sequential extraction procedure specifically developed for appraising arsenic mobility in sediments. Toxicity assessment was performed on sediment elutriates, solid phases and aqueous arsenic species as single substance using the embryo-toxicity test on oyster larvae (Crassostrea gigas) and the Microtox test with Vibrio fischeri. Toxicity results showed that all sediment samples presented acute and sub-chronic toxic effects on oyster larvae and bacteria, respectively. The Microtox solid phase test allow to discriminate As-contaminated samples from the less contaminated ones, suggesting that toxicity of whole sediment samples is related to arsenic content. Toxicity of dissolved arsenic species as single substance showed that Vibrio fischeri and oyster larvae are most sensitive to As(V) than As(III). The distribution coefficient (Kd) of arsenic in sediment samples was estimated using results obtained in chemical sequential extractions. The Kd value is greater in SM (450 Lkg(-1)) than in EST (55 Lkg(-1)), indicating that arsenic availability is higher for the most toxic sediment sample (Estaque port). This study demonstrates that arsenic speciation play an important role on arsenic mobility and its bioavailability in marine port sediments., (Copyright © 2012 Elsevier Ltd. All rights reserved.)
- Published
- 2013
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36. Toxicity of TiO(2) nanoparticles to cladocerans, algae, rotifers and plants - effects of size and crystalline structure.
- Author
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Clément L, Hurel C, and Marmier N
- Subjects
- Animals, Biological Assay, Crystallization, Nanoparticles chemistry, Particle Size, Titanium chemistry, Toxicity Tests, Chlorella vulgaris drug effects, Daphnia drug effects, Diatoms drug effects, Nanoparticles toxicity, Rotifera drug effects, Titanium toxicity
- Abstract
With the rapid development of nanotechnology, there is an increasing risk of human and environmental exposure to nanotechnology-based materials. However, the data on the potential environmental effects of nanoparticles are scarce. The aim of this study is to assess the effect of particle size and crystal structure (anatase and rutile) of titanium dioxide on their toxicity. Thus, acute and chronic toxicity tests included a modified acute test (72 h) using daphnies and algae, rotifers and plants as model organisms. Gradient of toxicity varied with the tested biological organisms. Our results revealed that TiO(2) nanoparticles in anatase crystal structure are toxic in the entire set of tests conducted. However, at highconcentration, through their antimicrobial properties, they significantly promoted growth of roots. Because of its lipophilicity, the rutile crystalline structure of TiO(2) NPs form larger aggregates in aqueous medium; then they have less effect on biological organisms, and thus a lower toxicity than the anatase crystalline form of TiO(2). We also demonstrated that exposure duration, aggregation and concentrations are contributing factors in nanoparticles-mediated toxicity., (Copyright © 2012 Elsevier Ltd. All rights reserved.)
- Published
- 2013
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37. Effect of temperature on the sorption of europium on alumina: microcalorimetry and batch experiments.
- Author
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Morel JP, Marmier N, Hurel C, and Morel-Desrosiers N
- Subjects
- Adsorption, Calorimetry, Temperature, Thermodynamics, Water chemistry, Aluminum Oxide chemistry, Europium chemistry
- Abstract
The determination of enthalpies of reactions (aqueous and surface complexation) is used in this work to model the temperature effect on the adsorption processes. Microcalorimetry experiments were carried out to determine the enthalpy of adsorption of europium on γ-alumina at 25 °C. The stability constants at 50 °C were then calculated with the van't Hoff equation, and a 2-pK approach was used to model the adsorptive behavior of Eu on alumina at 50 °C, as a function of pH. The results have shown that the adsorption of Eu(3+) on the alumina surface is weakly endothermic. In the experimental conditions considered in the present study, the temperature has only a small effect on the adsorption reaction., (Copyright © 2012 Elsevier Inc. All rights reserved.)
- Published
- 2012
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38. Ex situ remediation of contaminated sediments using mineral additives: assessment of pollutant bioavailability with the Microtox solid phase test.
- Author
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Mamindy-Pajany Y, Geret F, Roméo M, Hurel C, and Marmier N
- Subjects
- Aliivibrio fischeri drug effects, Ferric Compounds chemistry, Toxicity Tests methods, Water Pollutants, Chemical toxicity, Zeolites chemistry, Environmental Restoration and Remediation methods, Geologic Sediments chemistry, Minerals chemistry, Water Pollutants, Chemical chemistry
- Abstract
The aim of this work is to assess the potential ecotoxicological effects of contaminated sediments treated with mineral additives. The Microtox solid phase test was used to evaluate the effect of mineral additives on the toxicity of sediment suspensions. Four Mediterranean port sediments were studied after dredging and bioremediation: Sample A from navy harbor, sample B from commercial port and samples C and D from pleasure ports. Sediment samples were stabilized with three mineral additives: hematite, zero-valent iron and zeolite. Results show that all studied mineral additives can act as stabilizer agent in highly contaminated sediments (A and C) by decreasing dissolved metal concentrations and sediment toxicity level. On the contrary, for the less contaminated samples (B and D) hematite and zeolite can provoke toxic effect towards Vibrio fischeri since additive particles can favor bacteria retention and decrease bioluminescence emission., (Copyright © 2011 Elsevier Ltd. All rights reserved.)
- Published
- 2012
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39. Influence of uranium on bacterial communities: a comparison of natural uranium-rich soils with controls.
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Mondani L, Benzerara K, Carrière M, Christen R, Mamindy-Pajany Y, Février L, Marmier N, Achouak W, Nardoux P, Berthomieu C, and Chapon V
- Subjects
- Bacteria isolation & purification, Bacteria metabolism, Iron metabolism, Microscopy, Minerals chemistry, Molecular Sequence Data, Oxidation-Reduction, Bacteria drug effects, Soil chemistry, Soil Microbiology, Uranium analysis, Uranium pharmacology
- Abstract
This study investigated the influence of uranium on the indigenous bacterial community structure in natural soils with high uranium content. Radioactive soil samples exhibiting 0.26% - 25.5% U in mass were analyzed and compared with nearby control soils containing trace uranium. EXAFS and XRD analyses of soils revealed the presence of U(VI) and uranium-phosphate mineral phases, identified as sabugalite and meta-autunite. A comparative analysis of bacterial community fingerprints using denaturing gradient gel electrophoresis (DGGE) revealed the presence of a complex population in both control and uranium-rich samples. However, bacterial communities inhabiting uraniferous soils exhibited specific fingerprints that were remarkably stable over time, in contrast to populations from nearby control samples. Representatives of Acidobacteria, Proteobacteria, and seven others phyla were detected in DGGE bands specific to uraniferous samples. In particular, sequences related to iron-reducing bacteria such as Geobacter and Geothrix were identified concomitantly with iron-oxidizing species such as Gallionella and Sideroxydans. All together, our results demonstrate that uranium exerts a permanent high pressure on soil bacterial communities and suggest the existence of a uranium redox cycle mediated by bacteria in the soil.
- Published
- 2011
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40. The toxicity of composted sediments from Mediterranean ports evaluated by several bioassays.
- Author
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Mamindy-Pajany Y, Hamer B, Roméo M, Géret F, Galgani F, Durmiši E, Hurel C, and Marmier N
- Subjects
- Aliivibrio fischeri drug effects, Animals, Crassostrea drug effects, Crassostrea embryology, Embryo, Nonmammalian drug effects, Environmental Monitoring, Flax drug effects, Geologic Sediments chemistry, Mediterranean Sea, Mutagens toxicity, Photosynthesis drug effects, Risk Assessment, Seawater chemistry, Seeds drug effects, Toxicity Tests, Geologic Sediments analysis, Refuse Disposal methods, Water Pollutants toxicity
- Abstract
This work investigates the ecotoxicological evaluation of contaminated dredged sediments from French Mediterranean navy harbour (A), commercial port (B) and two composite specimens (C) and (D) coming from the mixture of A and B with other port sediments. The toxicity of elutriates from these sediments is estimated using embryo-toxicity test, Microtox® solid phase test, LuminoTox, phytotoxicity tests and genotoxicity test. Bioassay responses are not clearly correlated with chemical contamination in the whole sediment and vary as a function of tested organisms. The highest contaminated samples (A and C) are almost always more toxic than the less contaminated samples (B and D). Among composite sediments, the mixture effect with other sediments is not efficient to decrease toxicity in sample C, suggesting that other parameters influence toxicity level such as particle size or organic matter content. These parameters should be taken into consideration in order to improve the efficiency of the mixture process and produce composite sediments with low toxicity., (Copyright © 2010 Elsevier Ltd. All rights reserved.)
- Published
- 2011
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41. Ecotoxicological evaluation of Mediterranean dredged sediment ports based on elutriates with oyster embryotoxicity tests after composting process.
- Author
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Mamindy-Pajany Y, Libralato G, Roméo M, Hurel C, Losso C, Ghirardini AV, and Marmier N
- Subjects
- Animals, Embryo, Nonmammalian abnormalities, Filtration, France, Mediterranean Region, Ostreidae drug effects, Reference Standards, Seawater chemistry, Ecotoxicology methods, Embryo, Nonmammalian drug effects, Geologic Sediments chemistry, Ostreidae embryology, Soil, Toxicity Tests, Water Pollutants, Chemical toxicity
- Abstract
The ecotoxicological effect of dredged sediments was estimated by embryo-larval toxicity of the oyster Crassosstrea gigas in sediment elutriates (filtered and unfiltered). The study covers the main ports from the French Mediterranean coast. Composted sediments from a navy harbour (A), a commercial port (B) and two composite specimens (C and D) obtained after mixing various sediments were taken into consideration. Effective concentrations affecting 50% of larvae (EC50) were obtained from different elutriate concentrations (from 0 to 100%). Toxicity results obtained from filtered elutriates decreased according to the following gradient: sample A (5.68%), B (20.50%), C (37.60%) and D (47.17%). Chemical concentrations in whole sediments were in agreement with those in elutriates. Among the measured contaminants in elutriates, Cu and Zn resulted as the main contributors to toxicity. Dissolved organic carbon played an important role by exerting a protective effect against the toxicity of dissolved Cu. Toxicity results were interpreted on the basis of toxicity scores to give indication about sediment quality which provided more severe judgement than risk score based on chemical concentrations in sediments., (Copyright 2009 Elsevier Ltd. All rights reserved.)
- Published
- 2010
- Full Text
- View/download PDF
42. Sorption of Cr(VI) onto natural iron and aluminum (oxy)hydroxides: effects of pH, ionic strength and initial concentration.
- Author
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Ajouyed O, Hurel C, Ammari M, Ben Allal L, and Marmier N
- Subjects
- Adsorption, Hydrogen-Ion Concentration, Osmolar Concentration, Aluminum Hydroxide chemistry, Chromium chemistry, Iron chemistry
- Abstract
The aim of this work is to study the performances of removal of hexavalent chromium from aqueous solution by three different oxy-hydroxides: hematite, goethite and alpha-alumina. Batch experiments were conducted to measure the effects on adsorption of Cr(VI) of different parameters such as pH of the medium, ionic strength, and initial concentration. Results showed that the adsorption of Cr(VI) depends strongly on the pH, but is independent of ionic strength for hematite and goethite. For alpha-alumina, adsorption is strongly dependent on pH values and ionic strength. Equilibrium studies showed that Cr(VI) had a high affinity in an acidic medium, but decreased as solution pH increased. Equilibrium isotherms were measured experimentally. Results were analyzed by the Langmuir and Freundlich equations using linearized correlation coefficient at room temperature. The characteristic parameters for each isotherm have been determined. Langmuir equation was found to fit the equilibrium data for Cr(VI) adsorption.
- Published
- 2010
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43. Acid-base properties of the alumina surface: influence of the titration procedures on the microcalorimetric results.
- Author
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Morel JP, Marmier N, Hurel C, and Morel-Desrosiers N
- Subjects
- Calorimetry, Hydrogen-Ion Concentration, Microchemistry, Temperature, Titrimetry, Aluminum Oxide chemistry
- Abstract
The enthalpy changes associated with the protonation and deprotonation of an alumina surface have been determined on the basis of microcalorimetry experiments and acid-base potentiometric titrations at 25 degrees C. It has been shown that the results may vary significantly according to the experimental procedure. In order to do so, the potentiometric and microcalorimetric titrations have been carried out first from an acidic pH to basic pH and second from a pH near the pH(zpc) of alumina to acidic or basic pH. It has been demonstrated that the pK(a) values deduced from the potentiometric titrations are the same whatever the experimental protocol whereas the only way to obtain meaningful enthalpies of proton exchange is to carry out microcalorimetric titrations by starting around the point of zero charge.
- Published
- 2009
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44. Competition between selenium (IV) and silicic acid on the hematite surface.
- Author
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Jordan N, Marmier N, Lomenech C, Giffaut E, and Ehrhardt JJ
- Subjects
- Adsorption, Hydrogen-Ion Concentration, Radioactive Waste prevention & control, Surface Properties, Time Factors, Ferric Compounds chemistry, Selenium chemistry, Silicic Acid chemistry
- Abstract
Competition between selenium (IV) and silicic acid for the hematite (alpha-Fe(2)O(3)) surface has been studied during this work. Single batch experiments have been performed to study separately the sorption of selenium (IV) and silicic acid as a function of the pH. With the help of the 2-pK surface complexation model, experimental data have been fitted using the FITEQL 4.0 program. Two monodentate inner-sphere surface complexes have been used to fit selenite ions retention, triple bond FeSeO(3)(-) and triple bond FeHSeO(3). In order to fit sorption of silicic acid, the two following surface complexes, namely triple bond FeH(3)SiO(4), and triple bond FeH(2)SiO(4)(-), have been used. Using the surface complexation constants coming from these two binary systems, prediction curves of the effect of silicic acid on the retention of selenium (IV) onto hematite have been obtained. Finally, performed experiments showed a competition between selenium (IV) and silicic acid for the surface sites of hematite. Experimental data matched DDLM predictions, confirming the ability of the surface complexation model to predict quantitatively and qualitatively the ternary system selenium (IV)/H(4)SiO(4)/hematite.
- Published
- 2009
- Full Text
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45. Sorption of selenium(IV) onto magnetite in the presence of silicic acid.
- Author
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Jordan N, Lomenech C, Marmier N, Giffaut E, and Ehrhardt JJ
- Abstract
Sorption of selenium(IV) and silicic acid onto magnetite (Fe(3)O(4)) was investigated in binary systems, with concentrations of silicic acid under the solubility limit of amorphous silica. Using the double diffuse layer model (DDLM), surface complexation constants of selenium(IV) and H(4)SiO(4) onto magnetite were extracted using Fiteql 4.0. Then, prediction curves of the sorption of selenium(IV) in the presence of silicic acid onto magnetite were obtained, using the calculated surface complexation constants. Finally, laboratory experiments were performed and showed a competition between selenium(IV) and silicic acid for the surface sites of magnetite. Experimental results matched the model predictions, confirming its ability to model qualitatively and quantitatively the ternary system.
- Published
- 2009
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46. Sorption of silicates on goethite, hematite, and magnetite: experiments and modelling.
- Author
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Jordan N, Marmier N, Lomenech C, Giffaut E, and Ehrhardt JJ
- Subjects
- Adsorption, Minerals, Models, Chemical, Ferric Compounds chemistry, Ferrosoferric Oxide chemistry, Iron Compounds chemistry, Silicates chemistry, Surface Properties
- Abstract
Sorption of H(4)SiO(4) (including experiments as a function of time, K(d) measurement with different m/v ratios and sorption edges) onto different iron (hydro)oxides as goethite (alpha-FeOOH), hematite (alpha-Fe(2)O(3)), and magnetite (Fe(3)O(4)) has been studied with concentration of silicates under solubility limit. A surface complexation model has been used to account for sorption edge of silicates onto these iron oxide surfaces. It reveals that two types of surface complex namely FeH(3)SiO(4) and FeH(2)SiO(4)(-), are needed to describe properly the experimental observations.
- Published
- 2007
- Full Text
- View/download PDF
47. Effect of temperature on the acid-base properties of the alumina surface: microcalorimetry and acid-base titration experiments.
- Author
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Morel JP, Marmier N, Hurel C, and Morel-Desrosiers N
- Abstract
Sorption reactions on natural or synthetic materials that can attenuate the migration of pollutants in the geosphere could be affected by temperature variations. Nevertheless, most of the theoretical models describing sorption reactions are at 25 degrees C. To check these models at different temperatures, experimental data such as the enthalpies of sorption are thus required. Highly sensitive microcalorimeters can now be used to determine the heat effects accompanying the sorption of radionuclides on oxide-water interfaces, but enthalpies of sorption cannot be extracted from microcalorimetric data without a clear knowledge of the thermodynamics of protonation and deprotonation of the oxide surface. However, the values reported in the literature show large discrepancies and one must conclude that, amazingly, this fundamental problem of proton binding is not yet resolved. We have thus undertaken to measure by titration microcalorimetry the heat effects accompanying proton exchange at the alumina-water interface at 25 degrees C. Based on (i) the surface sites speciation provided by a surface complexation model (built from acid-base titrations at 25 degrees C) and (ii) results of the microcalorimetric experiments, calculations have been made to extract the enthalpic variations associated respectively to first and second deprotonation of the alumina surface. Values obtained are deltaH1 = 80+/-10 kJ mol(-1) and deltaH2 = 5+/-3 kJ mol(-1). In a second step, these enthalpy values were used to calculate the alumina surface acidity constants at 50 degrees C via the van't Hoff equation. Then a theoretical titration curve at 50 degrees C was calculated and compared to the experimental alumina surface titration curve. Good agreement between the predicted acid-base titration curve and the experimental one was observed.
- Published
- 2006
- Full Text
- View/download PDF
48. Using CCM for the Prediction of Sorption Curves under Varying Ionic Strength Conditions: Reply to Some Comments.
- Author
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Marmier N
- Abstract
In response to the comments of J. Lützenkirchen (237, 297 (2001), J. Colloid Interface Science), it is pointed out that the criticized model is not intended to provide a complete description of the system studied (Cs on silica-magnetite). Rather, it is a simplification of a complex natural system. The accuracy of the obtained predictions requires further investigation. Copyright 2001 Academic Press.
- Published
- 2001
- Full Text
- View/download PDF
49. Sorption Mechanisms of Eu(3+) on CSH Phases of Hydrated Cements.
- Author
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Pointeau I, Piriou B, Fedoroff M, Barthes MG, Marmier N, and Fromage F
- Abstract
The sorption mechanisms of Eu(3+) on calcium silicate hydrate (CSH) phases of hydrated cement were investigated as a tool for the prediction of the behavior of trivalent radionuclides with aged/degraded cements in radioactive waste repositories. Four techniques were used: site-selective and time-resolved luminescence spectroscopy, XPS, high-resolution SEM coupled with EDX, and XRD. Results showed that europium is not precipitated in the solution despite its low solubility limit. It is strongly retained on CSH, resulting in a more than 99.8% sorption rate. Two main sorption sites were characterized by luminescence spectroscopy. One site, with a long lifetime, can be interpreted as Eu included in the framework of CSH. Another one, with a shorter lifetime, can be interpreted as a site with a hydrated environment that is high but is less than that of europium hydroxide. It corresponds to superficial complexation or precipitation. Copyright 2001 Academic Press.
- Published
- 2001
- Full Text
- View/download PDF
50. Sorption of Cs(I) on Magnetite in the Presence of Silicates.
- Author
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Marmier N and Fromage F
- Abstract
The sorption of H(4)SiO(4) on magnetite has been qualified and quantified using three different surface complexation models, CCM, DLM, and NEM. The three tested models can account for the sorption of silicates using the same stoichiometry, one neutral species binding on a neutral surface, and the same constant, error aside. Experiments have also been performed to demonstrate that the sorption of dissolved silicates has a nonnegligible effect on the behavior of the surface of magnetite. Then, the sorption of cesium is insignificant on the neat surface of magnetite and is increased up to 10-20% when silicates are present in solution. A theoretical model, where the rule of electrostatics is pointed out, has been developed to account for the experimental observations. This model allows the reproduction of the sorption of cesium in the presence of dissolved silicates for the following four cases: -concentration of silicates under solubility limit -concentration of silicates over solubility limit -binary mixtures of silica and magnetite -natural magnetite with silica as impurity. The reaction given in the model to account for the experimental observations proposes that silicates may act as a "bridge" between the surface of magnetite and cesium. Copyright 2000 Academic Press.
- Published
- 2000
- Full Text
- View/download PDF
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