Sources of low-arsenic groundwater in the Bengal Basin: investigating the influence of the last glacial maximum palaeosol using a 115-km traverse across Bangladesh

Sources of low-arsenic groundwater in the Bengal Basin: investigating the influence of the last glacial maximum palaeosol using a 115-km traverse across Bangladesh
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孟加拉盆地低砷地下水来源:通过穿越孟加拉国 115 公里来调查末次盛冰期古土壤的影响

DOI:
10.1007/s10040-014-1139-8
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发表时间:
2014
影响因子:
2.8
通讯作者:
Hoque M
Hoque M
中科院分区:
地球科学3区
文献类型:
--
作者:
Hoque M

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孟加拉盆地(孟加拉国和印度西孟加拉)的地下水受到砷(As)污染,使1亿多消费者的健康受到威胁。利用1,580个钻孔岩性测井和2,387口威尔斯已发表的水化学资料,预测在孟加拉盆地至少45,000平方公里之下的被保护性古土壤覆盖的棕色砂古河间含水层中存在低砷(<10微克/升)地下水。据预测,含水层的深度最低为地面以下25米,一般不超过50米。预测证实了沿着东西横贯115公里长(即跨越孟加拉国的一半),钻28个新的钻孔,91米深,以揭示地下沉积学,并通过映射作为地下水的分布。所确定的含水层通常低于40百万加仑,因此可通过当地钻探方法进入。一个保护性的古土壤,盖的古河间含水层,防止向下运动到他们的作为污染的地下水存在于较浅的古河道含水层,并确保古河间含水层将产生低As地下水在可预见的未来。它们的使用,在较浅的砷污染的古河道含水层的地方,将迅速减轻健康风险的消费砷污染的地下水。
Pollution of groundwater in the Bengal Basin (Bangladesh and West Bengal, India) by arsenic (As) puts at risk the health of more than 100 million consumers. Using 1,580 borehole lithological logs and published hydrochemistry on 2,387 wells, it was predicted that low-As (<10 μg/L) groundwater exists, in palaeo-interfluvial aquifers of brown sand capped by a protective palaeosol, beneath at least 45,000 km2 of the Bengal Basin. The aquifers were predicted to be at a depth of as little as 25 m below ground level (mbgl), and typically no more than 50 mbgl. The predictions were confirmed along an east–west traverse 115 km in length (i.e. across half of Bangladesh) by drilling 28 new boreholes to 91-m depth to reveal subsurface sedimentology, and by mapping As distribution in groundwater. The aquifers identified occur at typically <40 mbgl and so are accessible with local drilling methods. A protective palaeosol that caps the palaeo-interfluvial aquifers prevents downward movement into them of As-polluted groundwater present in shallower palaeo-channel aquifers and ensures that the palaeo-interfluvial aquifers will yield low-As groundwater for the foreseeable future. Their use, in place of the shallower As-polluted palaeo-channel aquifers, would rapidly mitigate the health risks from consumption of As-polluted groundwater.
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发表时间: 2011-02
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