Role of metal-reducing bacteria in arsenic release from Bengal delta sediments
Role of metal-reducing bacteria in arsenic release from Bengal delta sediments
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DOI：
10.1038/nature02638
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发表时间：
2004-07-01
期刊：
影响因子：
64.8
通讯作者：
Lloyd, JR
中科院分区：
文献类型：
--
作者：
Islam, FS;Gault, AG;Lloyd, JR
从沉积物中提取的砷对抽取用于饮用和灌溉的地下沃茨的污染威胁着全世界数千万人的健康，最明显的是在孟加拉国和西孟加拉（1-3）。尽管在这些地区广泛使用富含砷的地下沃茨对人类健康产生了灾难性影响，但沉积物中砷释放的机制仍然缺乏特征，是国际上激烈辩论的主题（4-8）。我们使用显微镜为基础的方法来研究这些机制：微生物学和分子生态学技术结合水相和固相形态分析砷。在这里，我们表明，厌氧金属还原菌可以发挥关键作用，动员沉积物中的砷从污染的含水层在西孟加拉。我们还表明，在这项研究中的沉积物中，砷的释放发生后，Fe（III）的还原，而不是同时发生。确定控制砷的地球化学循环的关键因素是一个重要的贡献，充分知情的发展有效的战略，管理这些和其他类似的砷丰富的地下沃茨世界各地。
The contamination of ground waters, abstracted for drinking and irrigation, by sediment-derived arsenic threatens the health of tens of millions of people worldwide, most notably in Bangladesh and West Bengal(1-3). Despite the calamitous effects on human health arising from the extensive use of arsenic-enriched ground waters in these regions, the mechanisms of arsenic release from sediments remain poorly characterized and are topics of intense international debate(4-8). We use a microscosm-based approach to investigate these mechanisms: techniques of microbiology and molecular ecology are used in combination with aqueous and solid phase speciation analysis of arsenic. Here we show that anaerobic metal-reducing bacteria can play a key role in the mobilization of arsenic in sediments collected from a contaminated aquifer in West Bengal. We also show that, for the sediments in this study, arsenic release took place after Fe(III) reduction, rather than occurring simultaneously. Identification of the critical factors controlling the biogeochemical cycling of arsenic is one important contribution to fully informing the development of effective strategies to manage these and other similar arsenic-rich ground waters worldwide.