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Effects of Sulfide Input on Arsenate Bioreduction and Its Reduction Product Formation in Sulfidic Groundwater

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  • Yang Yang

    (Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China)

  • Xi Xie

    (School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China)

  • Mengna Chen

    (Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China)

  • Zuoming Xie

    (Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
    State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China)

  • Jia Wang

    (Changjiang River Scientific Research Institute, Wuhan 430014, China)

Abstract

Microbes have important impacts on the mobilization of arsenic in groundwater. To study the effects of sulfide on As(V) bioreduction in sulfidic groundwater, Citrobacter sp. JH012-1 isolated from sediments in the Jianghan Plain was used in a microcosm experiment. The results showed that sulfide significantly enhanced As(V) bioreduction as an additional electron donor. The reduction rates of As(V) were 21.8%, 34.5%, 73.6% and 85.9% under 0, 15, 75 and 150 µM sulfide inputting, respectively. The main products of As(V) bioreduction were thioarsenite and orpiment and the concentration of thioarsenite reached to 5.5 and 7.1 µM in the solution with the initial 75 and 150 µM sulfide, respectively. However, under 0 and 15 µM sulfide inputting, the dominant product was arsenite with no thioarsenite accumulation. The decrease in pH enhanced the bioreduction of As(V) and promoted the formation of thioarsenite and orpiment. In addition, the percentage of thioarsenite in total arsenic decreased with the decrease in the ratio of sulfur to arsenic, indicating that the formation of thioarsenite was limited by the concentration of initial sulfide. Therefore, the presence of sulfide had a significant effect on the transformation of arsenic in groundwater. This study provides new insights into the bioreduction of As(V) and the formation of thioarsenite in sulfidic groundwater.

Suggested Citation

  • Yang Yang & Xi Xie & Mengna Chen & Zuoming Xie & Jia Wang, 2022. "Effects of Sulfide Input on Arsenate Bioreduction and Its Reduction Product Formation in Sulfidic Groundwater," IJERPH, MDPI, vol. 19(24), pages 1-13, December.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:24:p:16987-:d:1006776
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    References listed on IDEAS

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    1. Farhana S. Islam & Andrew G. Gault & Christopher Boothman & David A. Polya & John M. Charnock & Debashis Chatterjee & Jonathan R. Lloyd, 2004. "Role of metal-reducing bacteria in arsenic release from Bengal delta sediments," Nature, Nature, vol. 430(6995), pages 68-71, July.
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