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Multimetallic contamination from Zn-ore smelter; solid speciation and potential mobility in riverine floodbank soils of the upper Lot River (SW France)

Yann Sivry, Marguerite Munoz, Valerie Sappin-Didier, Jean Riotte, Laurence Denaix, Philippe de Parseval, Christine Destrigneville and Bernard Dupre
Multimetallic contamination from Zn-ore smelter; solid speciation and potential mobility in riverine floodbank soils of the upper Lot River (SW France) (in Mineralogy, environment and health, Eric van Hullebusch (editor) and Stephanie Rossano (editor))
European Journal of Mineralogy (October 2010) 22 (5): 679-691

Abstract

The former Zn-ore smelting activity in Viviez (Aveyron, France) resulted in multimetallic contamination of the upper Lot River system (SW France). This study addresses for the first time the metals/metalloids mobility in impacted riverside fluvial soils due to reducing conditions during long-term flooding events. Six impacted riverside fluvio-soils were sampled along the Riou Mort and Lot rivers. Their levels of contamination decrease with the distance from the contamination source. Higher enrichment factors (EF) relative to French average soil metallic content occur 1 km far from the contamination source and vary from 3 for Sn, to 5 for As, 9 for Sb, 27 for Pb, 40 for Zn and 63 for Cd. At 20 km downstream from the contamination source, EF still reach a value of 3 for Cd and Zn. A micro-physical mineralogical characterisation of contaminated soils revealed a variety of metal-bearing phases: metallic compounds, oxides and sulphides, Fe oxides, glass and silicates as well as coke. Sequential chemical extraction experiments were conducted on the most contaminated soil in order to identify which mineral phases were the best candidates to release metals/metalloids. At the end of experiments more than 70% of total Cd and As, 55% of Zn and Sb, and 40% of Pb and Sn were extracted from the soil. Only Cd appeared as readily mobilised, with 33% of its total amount being extracted in the first steps of experiments. Under reducing conditions, iron oxyhydroxides, franklinite and multimetallic oxides are the best candidates, in decreasing order of importance, for metals/metalloids release from the soil.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 22
Serial Issue: 5
Title: Multimetallic contamination from Zn-ore smelter; solid speciation and potential mobility in riverine floodbank soils of the upper Lot River (SW France)
Title: Mineralogy, environment and health
Affiliation: Universite de Toulouse, Laboratoire des Mecanismes et Transferts en Geologie, Toulouse, France
Affiliation: Universite Paris-Est, Paris, France
Pages: 679-691
Published: 201010
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 49
Accession Number: 2010-098055
Categories: Environmental geologyGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, sketch map
N44°34'60" - N44°34'60", E02°08'60" - E02°08'60"
Secondary Affiliation: Universite Paris-Diderot, FRA, FranceInstitut National de la Recherche Agronomique, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201051
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