1. Analytical Electron-Microscopy Fractionation of Fine and Colloidal Particulate-Phosphorus in Riverbed and Suspended Sediments
- Author
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Françoise Elsass, Jérôme Poulenard, Jean-Marcel Dorioz, Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de la Recherche Agronomique (INRA), Unité de Science du Sol, Institut National de la Recherche Agronomique (INRA), Poulenard, Jérôme, Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Unité de recherche Science du Sol (USS), Laboratoire d'Hydrologie et de Géochimie de Strasbourg (LHyGeS), École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Ecole et Observatoire des Sciences de la Terre (EOST), and Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[SDV]Life Sciences [q-bio] ,Fractionation ,[SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study ,010501 environmental sciences ,01 natural sciences ,Colloid ,SEDIMENT EN SUSPENSION ,Geochemistry and Petrology ,POINT SOURCE POLLUTION ,[SDV.SA.SDS] Life Sciences [q-bio]/Agricultural sciences/Soil study ,ComputingMilieux_MISCELLANEOUS ,0105 earth and related environmental sciences ,PARTICULATE PHOSPHORUS ,Chemistry ,RIVER SEDIMENTS ,POLLUTION DIFFUSE ,Sediment ,04 agricultural and veterinary sciences ,Particulates ,6. Clean water ,Amorphous solid ,PHOSPHORUS ,SUSPENDED SEDIMENTS ,Geophysics ,Transmission electron microscopy ,Environmental chemistry ,[SDE]Environmental Sciences ,TEM ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Phosphate minerals ,Clay minerals ,PHOSPHORE PARTICULAIRE - Abstract
International audience; The impact particulate-phosphorus (particulate-P) has on eutrophication of aquatic systems that greatly depends on its composition. As a result, analysis methods for evaluating particulate-P speciation must be capable of identifying and/or quantifying the wide range of forms particulate-P can take. In the present study, we compare the particulate P speciation of the fine and colloidal fractions of riverbed sediment and suspended matter from two rivers in the Lake Geneva basin (French Alps) as determined with chemical extractions to results of a combined Transmission Electron Microscopy and Energy Dispersive Detection (TEM–EDS) analysis of the same samples. TEM–EDS provides semi-quantitative information about the distribution of P throughout the solid fraction of a sample and on the diversity of carrier phases, which are identified by their morphology and stochiometry. EDS-detectable quantities of phosphorus were found in 15–35% of the particles in the samples analyzed. As expected, particulate-P existed in a wide variety of forms, mostly associated with Al, Fe, Ca and Si. Some types of particles, often well-crystallized phosphate minerals, had high P contents (10–30%), but the dominant carrier phases of P were diffuse matrices of particles with low P contents (
- Published
- 2008