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Influence of As(V) on precipitation and transformation of schwertmannite in acid mine drainage-impacted waters

Pablo Cruz-Hernandez, Sergio Carrero, Rafael Perez-Lopez, Alejandro Fernandez-Martinez, Matthew B. J. Lindsay, Catherine Dejoie and Jose M. Nieto
Influence of As(V) on precipitation and transformation of schwertmannite in acid mine drainage-impacted waters
European Journal of Mineralogy (December 2018) 31 (2): 237-245

Abstract

Iron-rich sediments commonly cover riverbeds affected by acid mine drainage (AMD). Initial precipitates are often dominated by schwertmannite, which has an exceptionally high capacity to sequester As and other toxic elements. This poorly crystalline Fe oxyhydroxysulfate rapidly recrystallizes to goethite; however, the influence of trace elements on ageing rates and products is poorly understood. This study examined the influence of As(V) concentrations on the kinetics of schwertmannite precipitation and transformation. Schwertmannite was synthesized in the presence of various initial dissolved As concentrations (i.e., 0-2 mM) and subsequently aged at 40, 60 or 85 degrees C for 1 h to 300 d. The initial As concentration had a profound impact on schwertmannite precipitation and transformation. Schwertmannite precipitation was inhibited at higher initial As concentrations in favor of pseudo-amorphous Fe-hydroxyarsenate formation. Schwertmannite transformation to goethite was accompanied by sulfate release and, over longer time, As release. Pair distribution function (PDF) analysis of high-energy X-ray diffraction (HEXD) patterns revealed that increasing initial As concentration produced structural defects in associated precipitates. Schwertmannite precipitation exerts an important control on As mobility in AMD-impacted waters; however, this study has demonstrated that the long-term stability of schwertmannite and associated precipitates should be considered when designing AMD remediation strategies and AMD treatment systems.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 31
Serial Issue: 2
Title: Influence of As(V) on precipitation and transformation of schwertmannite in acid mine drainage-impacted waters
Affiliation: University of Huelva, Department of Earth Sciences, Spain
Pages: 237-245
Published: 20181207
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 41
Accession Number: 2019-003824
Categories: General geochemistryEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Universite Grenoble Alpes, FRA, FranceUniversity of Saskatchewan, CAN, CanadaEuropean Synchrotron Radiation Facility, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201904
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