Effect of carbon sources and of sulfate on microbial arsenic mobilization in sediments of West Bengal, India
Effect of carbon sources and of sulfate on microbial arsenic mobilization in sediments of West Bengal, India
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DOI：
10.1016/j.ecoenv.2013.01.021
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发表时间：
2013-05-01
影响因子：
6.8
通讯作者：
Gallert, Claudia
中科院分区：
文献类型：
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作者：
Freikowski, Dominik;Neidhardt, Harald;Gallert, Claudia
研究了孟加拉三角洲/西印度地区沉积物中砷溶解到地下水中的情况。选取了浅层地下水中砷浓度对比的两个试验点。明显的高砷和低砷沉积物斑块出现在邻近区域。以乳酸或乙醇为碳源，硫酸盐为电子受体的快速As动员和可能的本地菌群的影响，因为较高的As量和增加的总细胞计数在110天的时间内观察到。蔗糖是不太合适的碳源。接种从沉积物中分离的砷还原性恶臭假单胞菌WB并没有改善砷的动员。天然地下水水流中乳酸盐或乙醇+硫酸盐浸出沉积物柱中砷的浓度最高可达160 μ g/l，但大部分砷仍留在砂质沉积物中。砷与铁的溶出有一定的相关性，但与锰的溶出没有相关性。(c) 2013爱思唯尔公司版权所有。
Arsenic (As) dissolution from sediments into groundwater in the Bengal Delta/West India was investigated. Two experimental sites were choosen with contrasting As concentrations in shallow groundwater. Apparently patches of high-As and low-As sediments occured in close neigbourhood. A fast As mobilization with lactate or ethanol as carbon sources and sulfate as an electron acceptor and a possible influence of indigenous flora because of higher As amounts and an increasing total cell count was observed over a peroid of 110 days. Sucrose was a less suitable carbon source. Inoculation of an arsenate-reducing Pseudomonas putida WB, that was isolated from the sediments did not improve arsenic mobilization. Maximal arsenic concentrations up to 160 mu g/l were leached out from sediment columns with lactate or ethanol + sulfate in the water at natural groundwater flow, but the majority of the As remained in the sandy sediments. Some correlation of arsenic with Fe, but not with Mn dissolution seems to exist. (c) 2013 Elsevier Inc. All rights reserved.