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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Nature of arsenic pollutants in groundwater of Bengal basin - A case study from Baruipur area, West Bengal, India
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Nature of arsenic pollutants in groundwater of Bengal basin - A case study from Baruipur area, West Bengal, India

机译：孟加拉盆地地下水中砷污染物的性质-以印度西孟加拉邦Baruipur地区为例

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摘要

High incidence of arsenic in groundwater occurs as several small patches surrounded by zones with low arsenic in vast areas of West Bengal, India and adjoining Bangladesh. From the low- and high-arsenic groundwater zones, subsurface sediments have been analysed for mineral and chemical variations, in Baruipur, the worst arsenic-affected area in West Bengal. The Holocene sedimentary succession, in this part of Gangetic alluvium, shows a fining upward sequence from medium to fine sand, silt and finally to clav with occasional peat layer. The clay layer (As = 2-31 mg/kg) and peat layer (As = 9-40 mg/kg) contain higher concentration of arsenic compared to the silt layer (As = 2-6 mg/kg) and the sand layer (As = 1-7 mg/kg). It is inferred that the arsenic contamination in groundwater is related more with the components of sand, layer than others. Within the sandy layer, the components like (i) coated iron oxyhydroxides with residual magnetite and ilmenite (As = 14-112 mg/kg), (ii) illite (As = 10-40 mg/kg), (iii) iron hydroxide-coated sand grains (As = 30 mg/kg), (iv) chlorite (As = 5-31 mg/kg), (v) biotite (As = 9 mg/kg), and (vi) siderite concretions (As = 7-9 mg/kg) store most of the arsenic and are identified as the arsenic pollutants for groundwater in this part of Bengal basin. Arsenic is introduced into the aquifer sediments in soluble state and get adsorbed on iron-rich clastic grains and on authigenic siderite concretions. Adsorption of the element on the sites and its consequent desorption to the groundwater are interpreted to be controlled by microbial activity in the aquifer sediments.
机译：地下水中砷的高发发生率是在印度西孟加拉邦广大的地区以及与孟加拉国毗邻的几个小块地区，周围都是砷含量低的地区。在西孟加拉邦受砷影响最严重的地区巴鲁伊普尔，从低砷和高砷地下水区分析了地下沉积物的矿物和化学变化。在恒河冲积层的这一区域，全新世沉积层序显示出从中级到细砂，粉砂，最后到带偶层泥炭层的clav的精细上升顺序。与粉砂层（As = 2-6 mg / kg）和砂层相比，粘土层（As = 2-31 mg / kg）和泥炭层（As = 9-40 mg / kg）含有更高的砷含量。 （As = 1-7 mg / kg）。可以推断，地下水中的砷污染与沙子，沙层的成分有关的更多。在沙层中，这些成分包括：（i）涂覆有残留磁铁矿和钛铁矿的氢氧化铁（As = 14-112 mg / kg），（ii）伊利石（As = 10-40 mg / kg），（iii）氢氧化铁涂层砂粒（As = 30 mg / kg），（iv）亚氯酸盐（As = 5-31 mg / kg），（v）黑云母（As = 9 mg / kg）和（vi）菱铁矿凝结物（As = 7-9 mg / kg）储存了大部分砷，并被确定为孟加拉盆地这一部分的地下水砷污染物。砷以可溶状态引入含水层沉积物中，并被富铁碎屑颗粒和自生菱铁矿结块吸附。元素在场地上的吸附以及随后对地下水的吸附被解释为受含水层沉积物中微生物活动的控制。

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