| 土著微生物作用下含水层沉积物砷的释放与转化 |
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| 引用本文： | 郭华明,唐小惠,杨素珍,沈照理,张玲.土著微生物作用下含水层沉积物砷的释放与转化[J].现代地质,2009,23(1). |
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| 作者姓名： | 郭华明 唐小惠 杨素珍 沈照理 张玲 |
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| 作者单位： | 1. 中国地质大学,水资源与环境学院,北京,100083
2. 中国科学院,微生物研究所,北京,100101 |
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| 基金项目： | 国家自然科学基金，教育部新世纪优秀人才支持计划 |
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| 摘 要： | 在原位采集内蒙古河套平原高砷含水层中沉积物和土著微生物的基础上,进行了室内微生物淋滤实验研究。实验过程中,使用了3种水溶液(包括去离子水和2种人工配水)和2种营养条件(包括添加2%葡萄糖和未添加葡萄糖)。结果表明,葡萄糖可强化土著微生物的活性,使得悬浮液pH值明显降低,并增加悬浮液中As质量浓度。配水成分影响悬浮物中As质量浓度。在第9 d之后,添加葡萄糖的样品中存在一定强度的硫酸根还原作用,且这种脱硫酸作用受配水成分的影响较小。研究表明,土著微生物影响下砷的释放和转化过程包括沉积物中As(V)的释放、溶液中As(V)的还原以及沉积物中As(Ⅲ)的释放等。与溶液As(V)相比,As(Ⅲ)更有利于沉积物As的释放。在As释放的过程中,溶液中Fe/Mn含量同时增加,且呈很好的线性相关关系。这意味着土著微生物作用下Fe/Mn氧化物矿物的还原性溶解是导致沉积物As释放的主要原因之一。
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| 关 键 词： | 地下水 还原环境 富集 生物地球化学 内蒙古 |
Indigenous Bacteria-mediated Release and Transformation of As in Aquifer Sediment from the Hetao Basin,Inner Mongolia |
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| GUO Hua-ming,TANG Xiao-hui,YANG Su-zhen,SHEN Zhao-li,ZHANG Ling.Indigenous Bacteria-mediated Release and Transformation of As in Aquifer Sediment from the Hetao Basin,Inner Mongolia[J].Geoscience——Journal of Graduate School,China University of Geosciences,2009,23(1). |
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| Authors: | GUO Hua-ming TANG Xiao-hui YANG Su-zhen SHEN Zhao-li ZHANG Ling |
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| Abstract: | Geogenic high As groundwater has been found worldwide with more than 100 million people being at risk.Mechanisms of As enrichment have received much attention at both scientific and governmental levels.Intact sediments and indigenous bacteria were sampled from high As aquifer of the Hetao Basin,Inner Mongolia.Bacteria leaching experiments were conducted by using deionized water and two artificial water solutions in different nutrient conditions(including 2% glucose as carbon source and glucose-free).Results show that glucose has stimulated indigenous bacteria activities,which has resulted in a continuous decrease in suspension pH and a distinct increase in As concentration of glucose-amended suspensions.Chemical compositions(especially As species)affect As enrichment in suspensions.Reduction of sulfate was evidently observed after 9 d of incubation amended with glucose,which is slightly affected by chemical compositions of solution.Indigenous bacteria-mediated release and transformation of As are believed to include release of sediment As(V),reduction of solution As(V) and release of sediment As(Ⅲ).Therefore,solution As(Ⅲ) would promote As mobilization from sediment.During As release,concentrations of Fe and Mn concomitantly increase in suspensions.Concentration of suspension As exhibits a good linear relationship with that of Fe,with a correlation coefficient of 0.967,1.It implies that indigenous bacteria-mediated reduction of Fe/Mn oxides would greatly contribute to As mobilization in aquifer sediments. |
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| Keywords: | groundwater reductive environment enrichment biogeochemistry Inner Mongolia |
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