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Factors and pathways regulating the release and transformation of arsenic mediated by DFeRB and SRB
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  • Changwei Lü,
  • Wenjing Shi,
  • Wenjie Song,
  • Jinli Zheng,
  • Yu Luo,
  • Geer Qile,
  • Sijie Lü,
  • Xiangmeng Lü,
  • Bin Zhou,
  • Jiang He
Changwei Lü
Inner Mongolia University

Corresponding Author:[email protected]

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Wenjing Shi
Inner Mongolia University
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Wenjie Song
Inner Mongolia University
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Jinli Zheng
Inner Mongolia University
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Yu Luo
Inner Mongolia University
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Geer Qile
Inner Mongolia University
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Sijie Lü
Inner Mongolia University
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Xiangmeng Lü
Inner Mongolia University
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Bin Zhou
Tianjin Academy of Eco-Environmental Sciences
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Jiang He
Inner Mongolia University
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Abstract

The novelty of this work is to explore the driving process and key environmental factors governing As mobilization mediated by DFeRB and SRB on the basis of continuous As speciation and environment parameters monitoring in sediment-water system. The results illustrated that DFeRB and SRB played a critical role in regulating As mobilization in sediment-overlying water system. The reduction process mediated by DFeRB and SRB significantly promotes reduction of As (V) and endogenous release of As. However, in the DFeRB and SRB mediated reduction, the main driving process and their key explanatory factors that dominated As mobility were obviously different. DFeRB presented significant effects on the reductive dissolution and re-distribution of Fe (III) oxyhydroxides and As-containing Fe (III) minerals as well as adsorption-desorption, which in turn influenced the transformation of iron species and the release and ecotoxicity of As. Significantly different form DFeRB, the effects of SRB on As behavior mainly by influencing adsorbed As, pyrite and As sulfides in sediment as well as the formation of sulfide during sulfate reduction. The main pathways on As mobilization were the direct effects of SRB, S2- and Fe2+. In addition, the role of NH4+-N for the driving process of As mobility is more pronounced for SRB-induced reduction. NO3--N is an essential factor affecting As mobility, but the effects of NO3--N on As was a non-significant pathways. This work is helpful to provide insight into the environmental effects of DFeRB and SRB on biogeochemical cycle of As.