Arsenic contamination in parts of Yamuna sub-basin, West Bengal.
Arsenic contamination in parts of Yamuna sub-basin, West Bengal.
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西孟加拉邦亚穆纳次流域部分地区的砷污染。
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
Sudhir Kumar
中科院分区：
文献类型：
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作者：
H. Joshi;A. Ghosh;D. Singhal;Sudhir Kumar
砷很少以游离状态存在，通常与硫、氧和铁结合。在环境中，砷的存在是由于几种含有这种元素的有机和无机形式的输入。砷以几种矿物的形式存在于煤、铅、锌、金和铜矿中，即毒砂（FeAsS）、雌黄（As2S3）、雄黄（AsS）、砷石（As2O3）和硫砷铅矿（FeAs2）。地下水中普遍存在的物质有两种形式，即无机砷的还原态亚砷酸盐[As（III）]和无机砷的氧化态砷酸盐[As（V）]。砷（III）的形态较易移动的，对生物有毒性。最近，在西孟加拉（印度）和孟加拉国的许多地方观察到慢性砷中毒的症状。本文通过对西孟加拉亚穆纳次盆地（纳迪亚和北24帕尔加纳斯区的一部分）现有资料的处理，进行了水文地质和水化学综合评价，以了解地下水砷污染的可能原因。一般在浅层含水层中观察到较高浓度的砷。研究区的西北部地区已被观察到是最受影响的季风期表现出较高的浓度。已观察到砷的浓度与砷的浓度成反比。砷值没有表明与许多其他成分有任何明确的联系。砷的积累也不能决定性地与研究区地下水位的下降。
Arsenic rarely occurs in free state and is generally found in combination with Sulphur, Oxygen and Iron. In the environment, Arsenic occurs as a result of several inputs that contain this element in organic and inorganic forms. Arsenic is present in Coal, Lead, Zinc, Gold and Copper ores in the form of several minerals viz. Arsenopyrite (FeAsS), Orpiment (As2S3), Realgar (AsS), Arsenolite (As2O3) and Lollingite (FeAs2). The commonly existing species in groundwater are in two forms viz. Arsenite [As(III)] which is the reduced state of inorganic Arsenic and Arsenate [As(V)], which is the oxidized state of inorganic Arsenic, The As(III) form is more mobile and toxic for living organisms. Recently, the symptoms of chronic arsenic poisoning have been observed in many parts of West Bengal (India) and Bangladesh. In the present study, an integrated evaluation of hydrogeology and hydrochemistry has been carried out by processing the available data of Yamuna sub-basin (Part of Nadia and North 24 Parganas district) of West Bengal in order to understand the possible reason of arsenic pollution in the ground water. Arsenic has generally been observed in higher concentration in shallow aquifer. Northwestern region of the study area has been observed to be the most effected with premonsoon periods exhibiting higher concentration. Transmissivity values have been observed to vary inversely with arsenic concentrations. Arsenic values have not indicated any well defined association with many other constituents. Arsenic buildup could also not be conclusively related to lowering of ground water table of the study area.