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Why comparison between different chemical extraction procedures is necessary to better assess the metals availability in sediments

Cuvier, Alicia and Leleyter, Lydia and Probst, Anne and Probst, Jean-Luc and Prunier, Jonathan and Pourcelot, Laurent and Le Roux, Gaël and Lemoine, Mélanie and Reinert, M. and Baraud, Fabienne Why comparison between different chemical extraction procedures is necessary to better assess the metals availability in sediments. (2021) Journal of Geochemical Exploration, 225. 106762. ISSN 0375-6742

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Official URL: https://doi.org/10.1016/j.gexplo.2021.106762

Abstract

Single and sequential extractions are current and useful tools for estimating the availability of metals in soils or sediments. Many chemical extraction procedures have been proposed in the literature, making the comparison difficult. This study compares the data consistency of the potential availability given by four chemical extractions commonly found in the literature: ➢two single procedures (using dilute HCl or EDTA as reactant) ➢two sequential procedures (the modified standardized 3-steps procedure of the Standards, Measurements and Testing Programme (SMTP), namely BCR-extraction, and the 7-steps procedure of Leleyter and Probst (1999), namely LP-extraction). The leaching procedures are all performed on the reference lake sediment CRM BCR-701, used as a reference to assess the accuracy of the modified standardized procedure of Rauret et al. (1999). The results show similar availabilities between HCl and EDTA single leaches for Zn, Cu, Cr and Pb and between HCl and the BCR procedures for Zn, Cu, Cr and Ni. The LP-extraction is the most aggressive of the four tested procedures (except for Pb extraction), mainly due to a better extraction of the exchangeable fraction, by a better dissolution of the acido-soluble phase and particularly to a better dissolution of the amorphous and crystalline Fe-oxides. The comparison between the four procedures reveals a major problem of Pb extraction, potentially due to the formation of lead precipitates during HCl and the LP-extractions, even if an overestimation of the lead availability by the BCR procedure cannot be excluded.

Item Type:Article
HAL Id:hal-03181584
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 - Toulouse INP (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 - UT3 (FRANCE)
Other partners > Normandie Université (FRANCE)
Laboratory name:
Funders:
Région Midi-Pyrénées (FRANCE) - Institut de Radioprotection et de Sûreté Nucléaire - IRSN (FRANCE)
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Deposited On:25 Mar 2021 15:55

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