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31 results on '"Micić, Vesna"'

4. Alkylphenolic Compounds in the Danube River

Author

Micić, Vesna, Hofmann, Thilo, Barceló, Damià, Editor-in-chief, Kostianoy, Andrey G., Editor-in-chief, Liska, Igor, editor, Aggarwal, P. K., Book Editor, Araguás, L. J. A., Book Editor, Baumgartner, A., Book Editor, Blaschke, A. P., Book Editor, Brauch, H.-J., Book Editor, Christoph, E. H., Book Editor, Csányi, B., Book Editor, Dokulil, M. T., Book Editor, Farnleitner, A. H., Book Editor, Graf, W., Book Editor, Habersack, H., Book Editor, Hamchevici, C., Book Editor, Hauer, C., Book Editor, Hlubikova, D., Book Editor, Hofmann, T., Book Editor, Huber, T., Book Editor, Hudcová, H., Book Editor, Jäger, E., Book Editor, Janauer, G. A., Book Editor, Kavka, G., Book Editor, Kirschner, A. K. T., Book Editor, Kováč, V., Book Editor, Leitner, P., Book Editor, László, F., Book Editor, Liska, I., Book Editor, Literathy, P., Book Editor, Makovinska, J., Book Editor, Mariani, G., Book Editor, Maringer, F. J., Book Editor, Mach, R. L., Book Editor, Micić, V., Book Editor, Müller, A., Book Editor, Newman, B. D., Book Editor, Papesch, W., Book Editor, Paunović, M., Book Editor, Pletterbauer, F., Book Editor, Popovici, M., Book Editor, Rank, D., Book Editor, Rauchbüchl, A., Book Editor, Reischer, G. H., Book Editor, Sacher, F., Book Editor, Scheidleder, A., Book Editor, Schmidt, B., Book Editor, Schmidt-Mumm, U., Book Editor, Schwarz, U., Book Editor, Seidel, C., Book Editor, Simonović, P., Book Editor, Skejo, H., Book Editor, Slobodnik, J., Book Editor, Sommer, R., Book Editor, Storck, F. R., Book Editor, Stevenson, M., Book Editor, Stietka, M., Book Editor, Udrea, I., Book Editor, Umlauf, G., Book Editor, van Gils, J., Book Editor, Vierheilig, J., Book Editor, Vitvar, T., Book Editor, von der Ohe, P. C., Book Editor, Wagner, F., Book Editor, Wollgast, J., Book Editor, and Zorić, K., Book Editor

Published
2015
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21. Emerging contaminants in sediment core from the Iron Gate I Reservoir on the Danube River

Author

Matić-Bujagić, Ivana, Grujić, Svetlana, Laušević, Mila, Hofmann, Thilo, Micić, Vesna, Matić-Bujagić, Ivana, Grujić, Svetlana, Laušević, Mila, Hofmann, Thilo, and Micić, Vesna

Abstract

The Iron Gate I Reservoir is the largest impoundment on the Danube River. It retains gt 50% of the incoming total suspended solids load and the associated organic contaminants. In the sediment core of the Iron Gate I Reservoir we report the presence and fate of four classes of emerging contaminants (pharmaceuticals, pesticides, steroids and perfluorinated compounds), predominantly not covered by the EU monitoring programs, but considered as future candidates. Based on contaminant's partitioning behavior in the water/sediment system and the suspected ecotoxicological potential asserted from the literature data, the risk of recorded concentrations for sediment-dwelling organisms was discussed. The high anticipated risk was associated with antibiotics sulfamethoxazole and erythromycin, and pesticides linuron and carbendazim (banned in the EU, but still approved for use in the investigated area) and malathion. This indicated the need for better control of release of these compounds into the river, and implied their inclusion in future regular monitoring. Higher concentrations of pharmaceuticals and most pesticides and sterols were recorded in the fragment of allochthonous coarser sediment, assumed to have entered the reservoir during a high discharge event. Only one perfluorinated compound was recorded in the upper part of the sediment core. The vertical concentration profiles of pesticides propazine and malathion indicated their uniform source, most likely atmospheric transport and deposition of particles deriving from agricultural land.

Published
2019

27. Groundwater Chemistry Has a Greater Influence on the Mobility of Nanoparticles Used for Remediation than the Chemical Heterogeneity of Aquifer Media

Author

Micić, Vesna, Bossa, Nathan, Schmid, Doris, Wiesner, Mark R., and Hofmann, Thilo

Abstract

The application of nanoscale zerovalent iron (nano-ZVI) particles for groundwater remediation has spurred research into the influence of the collector heterogeneity on the nano-ZVI mobility. The chemical heterogeneity of surfaces within aquifer media affects their surface charge distribution and their affinity for nano-ZVI. The groundwater chemistry affects the properties of both aquifer surfaces and the nano-ZVI particles. Commercial poly(acrylic acid)-coated nano-ZVI (PAA–nano-ZVI) particles were tested in column experiments using two solution chemistries and silica collectors with different degrees of chemical heterogeneity, achieved by ferrihydrite coating. A porous media filtration model was used to determine the attachment efficiency of PAA–nano-ZVI particles, and the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory was used to describe the interactions between PAA–nano-ZVI particles and the aquifer “collectors”. The mobility of PAA–nano-ZVI particles suspended in ultrapure water depended on the extent of ferrihydrite coating on the collector surfaces. The mobility of PAA–nano-ZVI particles under environmentally relevant conditions was independent of the collector chemical heterogeneity. The size of PAA–nano-ZVI aggregates doubled, inducing gravitational sedimentation and possibly straining as mechanisms of particle deposition. There was no repulsive energy barrier between particles and collectors, and the DLVO theory was unable to explain the observed particle attachment. Our results suggest that the groundwater chemistry has a greater influence on the mobility of PAA–nano-ZVI particles than the collector chemical heterogeneity. A better understanding of polymer adsorption to nanoparticles and its conformation under natural groundwater conditions is needed to further elucidate nanoparticle–collector interactions.

Published
2020
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28. Complex-conductivity monitoring to delineate aquifer pore clogging during nanoparticles injection.

Author

Adrián, Flores Orozco, Micić, Vesna, Bücker, Matthias, Gallistl, Jakob, Hofmann, Thilo, and Nguyen, Frederic

Subjects
*PARTICLE tracks (Nuclear physics), *SOIL testing, *ELECTRIC conductivity, *SOIL moisture, *PARTICLE size determination, *AQUIFERS
Abstract

Laboratory and field studies have demonstrated the applicability of nanoparticles (NP) for accelerated contaminant degradation. Beside other limitations (e.g. costs, delivery, longevity, non-target specific reactions), concerns of regulators arose regarding toxicity of injected NP and particles delivered off-target (i.e. renegade particles). Renegade particles also significantly reduce the efficiency of the remediation. The delivery of particles off-target is caused, mainly, by unintended fracking, where the fractures act then as preferential flow paths changing the trajectory of the particles. Hence, the real-time monitoring of particle injection is of major importance to verify correct particle delivery and thus help to optimize the remediation strategy. However, to date NP monitoring techniques rely on the analysis of soil and water samples, which cannot provide information about clogging or the formation of fractures away of the sampling points. To overcome these limitations, in this study we investigate the applicability of complex-conductivity imaging (CCI), a geophysical electrical method, to characterize possible pore clogging and fracking during NP injections. We hypothesize that both processes are related to different electrical footprints, considering the loss of porosity during clogging and the accumulation of NP in areas away of the target after fracking. Here, we present CCI results for data collected before and during the injection of Nano-Goethite particles (NGP) applied to enhance biodegradation of a BTEX (benzene, toluene, ethylbenzene and xylene) contaminant plume. Imaging results for background data revealed consistency with the known lithology, while overall high electrical conductivity values and a negligible induced-polarization magnitude correspond with the expected response of a mature hydrocarbon plume. Monitoring images revealed a general increase (∼15 per cent) in the electrical conductivity due to the injected NGP suspension in agreement with geochemical data. Furthermore, abrupt changes in this trend, shortly before daylighting events, show the sensitivity of the method to pore clogging. Such interpretation is in line with the larger variations in CCI resolved in the unsaturated zone, clearly indicating the accumulation of renegade NGP close to the surface due to fracking. Our results demonstrate the applicability of the CCI method for the assessment of pore clogging accompanying particles injection. [ABSTRACT FROM AUTHOR]

Published
2019
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29. Comment on the German Draft Legislation on Hydraulic Fracturing: The Need for an Accurate State of Knowledge and for Independent Scientific Research

Author

Elsner, Martin, primary, Schreglmann, Kathrin, additional, Calmano, Wolfgang, additional, Bergmann, Axel, additional, Vieth-Hillebrand, Andrea, additional, Wilke, Franziska D. H., additional, Wollin, Klaus-Michael, additional, Georgi, Anett, additional, Schmidt, Winfried, additional, Hofmann, Thilo, additional, Micić, Vesna, additional, Vengosh, Avner, additional, and Mayer, Bernhard, additional

Published
2015
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