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dc.contributor.authorSkierszkan, Elliott K.
dc.contributor.authorRobertson, Jared M.
dc.contributor.authorLindsay, Matthew B. J.
dc.contributor.authorStockwell, Justin S.
dc.contributor.authorDockrey, John W.
dc.contributor.authorDas, Soumya
dc.contributor.authorWeis, Dominique
dc.contributor.authorBeckie, Roger D.
dc.contributor.authorMayer, K. Ulrich
dc.date.accessioned2019-11-08T19:25:11Z
dc.date.available2019-11-08T19:25:11Z
dc.date.issued2019-04-18
dc.identifier.citationSkierszkan, E.K., Robertson, J.M., Lindsay, M.B.J., Stockwell, J.S., Dockrey, J.W., Das, S., Weis, D., Beckie, R.D., & Mayer, K.U., (2019). Tracing molybdenum attenuation in mining environments using molybdenum stable isotopes. Environmental Science and Technology 53, 5678–5686. https://doi.org/10.1021/acs.est.9b00766en_US
dc.identifier.issn0013-936X
dc.identifier.issn1520-5851
dc.identifier.urihttp://hdl.handle.net/10388/12445
dc.description.abstractMolybdenum contamination is a concern in mining regions worldwide. Better understanding of processes controlling Mo mobility in mine wastes is critical for assessing potential impacts and developing water-quality management strategies associated to this element. Here, we used Mo stable isotope (δ98/95Mo) analyses to investigate geochemical controls on Mo mobility within a tailings management facility (TMF) featuring oxic and anoxic environments. These isotopic analyses were integrated with X-ray absorption spectroscopy, X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and aqueous chemical data. Dissolved Mo concentrations were inversely correlated with δ98/95Mo values such that enrichment of heavy Mo isotopes in solution reflected attenuation processes. Inner-sphere complexation of Mo(VI) with ferrihydrite was the primary driver of Mo removal and was accompanied by a circa 1 ‰ isotope fractionation. Limited Mo attenuation and isotope fractionation was observed in Fe(II)- and Mo-rich anoxic TMF seepage, while attenuation and isotope fractionation were greatest during discharge and oxidation of this seepage after discharge into a pond where Fe-(oxyhydr)oxide precipitation promoted Mo sorption. Overall, this study highlights the role of sorption onto Fe-(oxyhydr)oxides in attenuating Mo in oxic environments, a process which can be traced by Mo isotope analyses.en_US
dc.publisherAmerican Chemical Societyen_US
dc.subjectmine wasteen_US
dc.subjectmolybdenumen_US
dc.subjectisotopesen_US
dc.subjectgroundwateren_US
dc.subjectiron (oxyhydr)oxidesen_US
dc.titleTracing molybdenum attenuation in mining environments using molybdenum stable isotopesen_US
dc.typeArticleen_US
dc.identifier.doi10.1021/acs.est.9b00766


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