Abstract
Adsorption of As(V) on various clay minerals including kaolinite (KGa-1), montmorillonite (SWy-1) and nontronites (NAU-1 and NAU-2), and subsequent bioreduction of sorbed As(V) to As(III) by bacterium Shewanella putrefaciens strain CN-32 were investigated. Nontronites showed relatively higher sorption capacity for As(V) primarily due to higher iron oxide content. Freundlich equation well described the sorption of As(V) on NAU-1, NAU-2 and SWy-1, while As(V) sorption isotherm with KGa-1 fitted well in the Langmuir model. The bacterium rapidly reduced 50 % of dissolved As(V) to As(III) in 2 h, followed by its complete reduction (>ca. 98 %) within 12 h. In contrast, sorption of As(V) to the mineral surfaces interferes with the activity of bacterium, resulting in low bioreduction of As(V) by 27 % for 5 days of incubation. S. putrefaciens also promoted the reduction of Fe(III) present in the clay mineral to Fe(II). This study indicates that the sorption and subsequent bioreduction of As(V) on clay minerals can significantly influence the mobility of As(V) in subsurface environment.
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The authors are thankful for the financial support of Ferdowsi University of Mashhad, Iran, and Mine Reclamation Corporation (MIRECO), S. Korea.
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Ghorbanzadeh, N., Lakzian, A., Halajnia, A. et al. Influence of clay minerals on sorption and bioreduction of arsenic under anoxic conditions. Environ Geochem Health 37, 997–1005 (2015). https://doi.org/10.1007/s10653-015-9708-x
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DOI: https://doi.org/10.1007/s10653-015-9708-x