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

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dc.contributor.authorCruz-Hernandez, Pablo
dc.contributor.authorCarrero, Sergio
dc.contributor.authorPérez-Lópeza, Rafael
dc.contributor.authorFernandez-Martinez, Alejandro
dc.contributor.authorLindsay, Matthew B. J.
dc.contributor.authorDejoie, Catherine
dc.contributor.authorNieto, José M.
dc.date.accessioned2022-10-26T20:32:30Z
dc.date.available2022-10-26T20:32:30Z
dc.date.issued2018-12-07
dc.description© 2018 E. Schweizerbart’sche Verlagsbuchhandlung, 70176 Stuttgart, Germanyen_US
dc.description.abstractIron-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 °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.en_US
dc.description.sponsorshipThis research was financed by the Spanish Ministry of Economy and Competitiveness through the SCYRE project (CGL2016-78783-C2-1-R). P. Cruz-Hernandez was supported by the Project FONDECYT Postdoctoral (3170082) and SCR-MAHG. M.B.J. Lindsay acknowledges support from the NSERC Discovery Grants Program (Grant No. RGPIN-2014-06589).en_US
dc.description.versionPeer Revieweden_US
dc.identifier.citationCruz-Hernández, P., Carrero, S., Pérez-López, R., Fernandez-Martinez, A., Lindsay, M.B.J., Dejoie, C., & Nieto, J.M. (2019). Influence of As(V) on precipitation and transformation of schwertmannite in acid mine drainage-impacted waters. European Journal of Mineralogy (Stuttgart), 31(2): 237–245. https://doi.org/10.1127/ejm/2019/0031-2821en_US
dc.identifier.doi10.1127/ejm/2019/0031-2821
dc.identifier.urihttps://hdl.handle.net/10388/14276
dc.language.isoenen_US
dc.publisherSchweizerbart science publishersen_US
dc.subjectschwertmanniteen_US
dc.subjectgoethiteen_US
dc.subjecthematiteen_US
dc.subjectageingen_US
dc.subjectkineticsen_US
dc.subjectacid drainageen_US
dc.subjectarsenicen_US
dc.titleInfluence of As(V) on precipitation and transformation of schwertmannite in acid mine drainage-impacted watersen_US
dc.typeArticleen_US

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