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    江汉平原高砷地下水原位微生物的铁还原及其对砷释放的影响

    高杰 郑天亮 邓娅敏 蒋宏忱

    高杰, 郑天亮, 邓娅敏, 蒋宏忱, 2017. 江汉平原高砷地下水原位微生物的铁还原及其对砷释放的影响. 地球科学, 42(5): 716-726. doi: 10.3799/dqkx.2017.059
    引用本文: 高杰, 郑天亮, 邓娅敏, 蒋宏忱, 2017. 江汉平原高砷地下水原位微生物的铁还原及其对砷释放的影响. 地球科学, 42(5): 716-726. doi: 10.3799/dqkx.2017.059
    Gao Jie, Zheng Tianliang, Deng Yamin, Jiang Hongchen, 2017. Indigenous Iron-Reducing Bacteria and Their Impacts on Arsenic Release in Arsenic-Affected Aquifer in Jianghan Plain. Earth Science, 42(5): 716-726. doi: 10.3799/dqkx.2017.059
    Citation: Gao Jie, Zheng Tianliang, Deng Yamin, Jiang Hongchen, 2017. Indigenous Iron-Reducing Bacteria and Their Impacts on Arsenic Release in Arsenic-Affected Aquifer in Jianghan Plain. Earth Science, 42(5): 716-726. doi: 10.3799/dqkx.2017.059

    江汉平原高砷地下水原位微生物的铁还原及其对砷释放的影响

    doi: 10.3799/dqkx.2017.059
    基金项目: 

    中央高校基本科研业务费专项基金“摇篮计划” No.CUGL140412

    国家自然科学基金面上项目 No.41572226

    中国地质调查局项目 Nos.12120114069301

    中国地质调查局项目 121201001000150121

    详细信息
      作者简介:

      高杰(1992-),女,硕士研究生,主要从事地下水污染与防治、水文地球化学等方面的科研工作.ORCID:0000-0002-1562-724X. E-mail: 2580343027@qq.com

      通讯作者:

      邓娅敏,ORCID:0000-0002-9613-8455.E-mail: yamin.deng@cug.edu.cn

    • 中图分类号: P593

    Indigenous Iron-Reducing Bacteria and Their Impacts on Arsenic Release in Arsenic-Affected Aquifer in Jianghan Plain

    • 摘要: 微生物参与铁氧化物矿物的还原性溶解是高砷地下水形成的关键过程,其中具有砷还原功能的微生物如何参与含水层砷释放的生物地球化学过程亟待研究.利用从江汉平原典型高砷含水层中厌氧条件下分离出的四株细菌(Citrobacter sp.JH-1、Clostridium sp.JH-6、Exiguobacterium sp.JH-13、Paenibacillus sp.JH-33),通过室内厌氧模拟培养实验,查明其砷、铁还原能力,并通过分别与铁氧化物矿物及原位沉积物共同培养,探究原位含水层微生物参与的砷释放机理.结果表明:四株细菌均具有厌氧条件下砷、铁还原功能,Citrobacter sp.JH-1砷还原能力最强,96 h内还原的As(Ⅴ)浓度为2.22 μmol/L.其中Citrobacter sp.JH-1不仅可在厌氧和有氧条件下还原溶液中的As(Ⅴ),还可在厌氧条件下还原溶液中的Fe(Ⅲ)和无定型的水铁矿,在与含水层沉积物共培养12 d后,沉积物中铁与砷的释放量分别为510 mg/kg及1 150 μg/kg.江汉平原含水层中的原位微生物兼具砷/铁还原功能,在厌氧条件下可还原沉积物中的铁氧化物矿物并促进砷的释放,为深入揭示高砷地下水成因机理与地下水砷污染的防控提供重要科学依据.

       

    • 图  1  江汉平原含水层原位分离的四株菌厌氧条件下砷还原能力

      Fig.  1.  The capacity of arsenic reduction of the four in-situ bacterial strains of Jianghan plain under anaerobic condition

      a.Exiguobacterium sp.JH-13;b.Paenibacillus sp.JH-33;c.Citrobacter sp.JH-1;d.Clostridium sp.JH-6

      图  2  Citrobacter sp.JH-1好氧条件(a)和厌氧条件(b)下砷还原能力

      Fig.  2.  The arsenic-reducing ability for Citrobacter sp.JH-1 under underaerobic (a) and anaerobic (b) condition

      图  3  江汉平原含水层原位分离的四株菌厌氧条件下铁还原能力

      Fig.  3.  The test about the capacity of iron reduction of the four in-situ bacterial strains of Jianghan plain under anaerobic condition

      a.Exiguobacterium sp.JH-13;b.Paenibacillus sp.JH-33;c.Citrobacter sp.JH-1;d.Clostridium sp.JH-6

      图  4  Citrobacter sp.JH-1厌氧条件下对水铁矿的还原能力

      Fig.  4.  The test about the the capacity of iron reduction for ferrihydrite of Citrobacter sp.JH-1 under anaerobic condition

      图  5  Citrobacter sp.JH-1厌氧条件下与含水层沉积物培养的砷铁释放过程

      Fig.  5.  The test about the the capacity of iron oxide minerals reduction and arsenic release in the sediment of Citrobacter sp.JH-1 under anaerobic condition

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    • 收稿日期:  2016-12-17
    • 刊出日期:  2017-05-15

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