Validity of the Latest Research Findings on Causes of Groundwater Arsenic Contamination in Bangladesh
Validity of the Latest Research Findings on Causes of Groundwater Arsenic Contamination in Bangladesh
复制标题
孟加拉国地下水砷污染原因最新研究结果的有效性
DOI：
10.1080/02508060108686930
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发表时间：
2001
影响因子：
2.6
通讯作者：
E. Ichion
中科院分区：
文献类型：
--
作者：
Md. Abul Fazal;T. Kawachi;E. Ichion
孟加拉国地下水砷污染问题是世界上最严重的。孟加拉国地下水砷污染的原因（动员）有两种假设。一种称为“黄铁矿氧化”，另一种称为“羟基氧化还原”。根据第一种假说，地下水砷污染是人为的，与地下水过量开采有关。另一方面，根据第二个，污染是自然的。英国地质调查局（BGS）进行了一项调查，以确定孟加拉国地下水砷污染的原因。根据他们的发现，他们拒绝了黄铁矿氧化假说，接受了氢氧化物还原假说。然而，一些专家反对他们的研究结果。因此，一个案例研究进行检查的有效性BGS的调查结果。虽然我们得到了与BGS相似的结果，但在估计污染的威尔斯井的百分比方面的误差，这些分析的关键参数表明，目前的结果以及BGS的结果不能可靠地得出关于污染原因的任何结论。此外，有效性检验表明，不同的水文地质参数的非均质含水层系统之间的空间依赖关系是无效的，代表时间依赖的现象。因此，BGS的结论是不成立的。尽管如此，黄铁矿氧化假说仍有可能被接受。为了得到最终的结论，我们必须通过生成可靠的随时间变化的场数据来观察时域中的这些关系。
Abstract The groundwater arsenic contamination problem in Bangladesh is the worst in the world. Two hypotheses are prevailing as the cause (mobilization) of groundwater arsenic contamination in Bangladesh. One is called “pyrite oxidation” and the other is “oxy-hydroxide reduction.” According to the first hypothesis, groundwater arsenic contamination is human-made, which has a relationship with excessive groundwater withdrawal. On the other hand, according to the second one, the contamination is natural. The British Geological Survey (BGS) conducted an investigation to identify the cause of groundwater arsenic contamination in Bangladesh. Based on their findings, they rejected the pyrite oxidation hypothesis and accepted the oxy-hydroxide reduction hypothesis. However, several experts are opposing their research findings. Therefore, a case study is undertaken to examine the validity of the BGS findings. Although we obtained results which are similar to the BGS, the errors in the estimates of percent of wells contaminated, the key parameter of these analyse show that the present as well as BGS results are not dependable to make any conclusion about the cause of contamination. Moreover, the validity test shows that space-dependent relationships among different hydro-geological parameters for the heterogeneous aquifer system are not valid to represent time-dependent phenomena. Therefore, the conclusion made by the BGS is not valid. Still, there is a possibility that the pyrite oxidation hypothesis could be accepted. For a final conclusion we must observe these relationships in a time domain by generating reliable time-dependent field data.