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Trace elements and Pb isotopes in soils and sediments impacted by uranium mining

Cuvier, Alicia and Pourcelot, Laurent and Probst, Anne and Prunier, Jonathan and Le Roux, Gaël Trace elements and Pb isotopes in soils and sediments impacted by uranium mining. (2016) Science of the Total Environment, 566-567. 238-249. ISSN 0048-9697

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Official URL: https://doi.org/10.1016/j.scitotenv.2016.04.213

Abstract

The purpose of this study is to evaluate the contamination in As, Ba, Co, Cu, Mn, Ni, Sr, V, Zn and REE, in a high uranium activity (up to 21,000 Bq∙kg−1) area, downstream of a former uranium mine. Different geochemical proxies like enrichment factor and fractions from a sequential extraction procedure are used to evaluate the level of contamination, the mobility and the availability of the potential contaminants. Pb isotope ratios are determined in the total samples and in the sequential leachates to identify the sources of the contaminants and to determine the mobility of radiogenic Pb in the context of uranium mining. In spite of the large uranium contamination measured in the soils and the sediments (EF ≫ 40), trace element contamination is lowto moderate (2 b EF b 5), except for Ba (5 b EF b 15), due to the precipitation of bariumsulfate resulting from mining activities. Most of the trace elements are associated with the most mobile fractions of the sediments/soils, implying an enhanced potential availability. Even if no Pb enrichment is highlighted, the Pb isotopic signature of the contaminated soils is strongly radiogenic. Measurements performed on the sequential leachates reveal inputs of radiogenic Pb in the most mobile fractions of the contaminated soil. Inputs of low-mobile radiogenic Pb frommining activities may also contribute to the Pb signature recorded in the residual phase of the contaminated samples. We demonstrate that Pb isotopes are efficient tools to trace the origin and themobility of the contaminants in environments affected by uranium mining.

Item Type:Article
HAL Id:hal-01916069
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut de Radioprotection et de Sûreté Nucléaire - IRSN (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Gael LE ROUX
Deposited On:08 Nov 2018 10:15

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