| 硫介导细菌还原载砷铁矿对砷迁移转化的影响 |
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| 引用本文： | 王晶,谢作明,王佳,杨洋,刘恩杨.硫介导细菌还原载砷铁矿对砷迁移转化的影响[J].地球科学,2021,46(2):642-651. |
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| 作者姓名： | 王晶 谢作明 王佳 杨洋 刘恩杨 |
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| 作者单位： | 1.中国地质大学环境学院, 湖北武汉 430078 |
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| 基金项目： | 国家自然科学基金面上项目;国家自然科学基金创新研究群体项目 |
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| 摘 要： | 硫在铁和砷的生物地球化学循环中发挥着重要作用，但地下水系统中硫循环的中间产物S(0)对细菌转化铁和砷的影响尚不清楚.采用室内模拟实验，研究硫参与下细菌D2201对液相和载砷针铁矿中Fe(III)和As(V)的还原作用.结果表明:细菌D2201具有很强的铁还原能力，可以将液相中74%的Fe(III)还原；加入硫后，细菌还原S(0)产生的S(-II)使铁还原率提高到94%.但是，硫没有明显影响细菌对砷的还原.在实验初期，细菌明显加速了载砷针铁矿的还原，最终还原释放到液相中的Fe(II)浓度为32.12 μmol/L；硫的加入增强了细菌对载砷针铁矿的还原，还原溶解的Fe(II)增加至284.13 μmol/L，同时，砷的释放量也增加了1.6倍.这些结果表明硫显著促进了细菌对针铁矿的还原溶解并加速砷的释放.XRD和SEM-EDS结果显示，细菌还原针铁矿但不改变其矿相，而硫的加入也仅使矿物发生一定程度的团聚，并没有使其转变为其他矿物，也未导致砷的再吸附.
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| 关 键 词： | 铁还原菌 针铁矿 硫 砷 迁移转化 地球化学 |
| 收稿时间： | 2020-01-20 |
Influence of Bioreduction of Arsenic-Bearing Goethite by Bacteria under Sulfur Mediation on Migration and Transformation of Arsenic |
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| Wang Jing,Xie Zuoming,Wang Jia,Yang Yang,Liu Enyang.Influence of Bioreduction of Arsenic-Bearing Goethite by Bacteria under Sulfur Mediation on Migration and Transformation of Arsenic[J].Earth Science-Journal of China University of Geosciences,2021,46(2):642-651. |
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| Authors: | Wang Jing Xie Zuoming Wang Jia Yang Yang Liu Enyang |
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| Affiliation: | (School of Environmental Studies,China University of Geosciences,Wuhan 430078,China;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430078,China) |
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| Abstract: | Sulfur plays an important role in the biogeochemical cycle of iron and arsenic.But the effect of S(0),an intermediate product of the sulfur cycle in groundwater systems,on biotransformation of iron and arsenic remains unexplored.Laboratory simulation experiments were conducted to investigate the reduction of Fe(Ⅲ)and As(Ⅴ)in the liquid phase and arsenic-bearing goethite by bacteria D2201 with sulfur.The results show that 74%of Fe(Ⅲ)in the liquid phase were reduced by the strain D2201 with strong iron-reducing potential.When sulfur was added,S(-Ⅱ)from the bacteria reducing S(0)increased the iron reduction rate to 94%.However,the bacterial reduction of arsenic was not accelerated significantly by added sulfur.Fe(Ⅲ)in arsenic-bearing goethite was reduced rapidly by the strain D2201 at the beginning of the experiment.In the experiment,32.12μmol/L Fe(Ⅱ)was released in the liquid phase.The added sulfur enhanced the bacterial reduction of arsenic-bearing goethite,and the released Fe(Ⅱ)increased to 284.13μmol/L.At the same time,the concentration of arsenic released into solution increased 1.6 times.The results indicate that sulfur significantly promoted the bacterial reduction and dissolution of arsenic-bearing goethite and accelerated the release of arsenic.It was shown by XRD and SEM-EDS that the mineral phase of iron mineral reduced by the strain D2201 was not changed.Under the condition of sulfur,the mineral only has a certain degree of agglomeration,not transform to other minerals.And arsenic was not adsorbed by the mineral once again. |
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| Keywords: | iron reducing bacteria goethite sulfur arsenic migration and transformation geochemistry |
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