| Groundwater pollution by arsenic concentration in sedimentary aquifers in the Indo-Gangetic Basin of Nepal |
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| 作者姓名： | Sunil Kumar Dwivedi Pusker Raj Joshi Sanjiv Shrestha Yaga Raj Bhandari Ram Bhadur Sah |
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| 作者单位： | [1]Department of Physics and Earth Sciences, University of the Ryukyus, Okinawa 903-0213, Japan [2]Department of Geology, Tri-Chandra College, Ghantaghar, Kathmandu, Nepal [3]Department of Environment Science, Tri-Chandra College, Ghantaghar, Kathmandu, Nepal [4]United Nation Development Programme （UNDP）, Kathmandu, Nepal [5]Central Department of Geology, Tirbhuvan University, Kirtipur, Kathmandu, Nepal |
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| 摘 要： | Naturally occurring arsenic （As） in groundwater of sedimentary aquifers has emerged as a global problem, and the Indo-Gangetic Basin of Nepal is no exception. In the sedimentary aquifers of the Indo-Gangetic Basin, arsenic enrichment and mobilization in groundwater by natural processes is considered an issue of major environmental health concern. About 11 million people, 47% of Nepali＇s total population living in the region and approximately 90% of them are relying on groundwater as their major source of drinking water. Moreover, 205555 ha of agricultural land in the basin are irrigated by groundwater through large numbers of deep and shallow irrigation tubewells for extensive cultivation of crops which has lead to creation of other pathways for arsenic ingestion among the people living in the region. It is estimated that around 0.5 million people in the basin are living at risk of arsenic poisoning In addition, some recent research shows the prevalence of dermatosis related to arsenicosis from 1.3% to 5.2 % and the accumulation of arsenic in biological samples like hair and nails much higher than the acceptance level. In these circumstances, the source of the natural arsenic concentration in groundwater of the Indo-Gangetic Basin is quite essential to explore. Therefore, to investigate the source of arsenic and management of arseniferious groundwater used for human consumption and irrigation, along with treatment or avoidance, is clearly an issue of research concern. Present research is carried out to understand the source of natural arsenic and its mobilization in groundwater of the Indo-Gangetic Basin. For this, we have collected bedrock, aquifer sediments and water samples from the study area. Sediment samples were taken from different lithofacies viz. clay, silt, sand and sandy gravels from groundwater aquifer where arsenic concentration is high. Water samples were taken from domestic shallow and deep tubewells in grid pattern. Bedrock samples were collected from source of the aquifer sediment, northern part of the Indo-Gangetic Basin, especially from the Siwalik and Lesser Himalaya. This paper particularly focuses on geology, mineralogy, hydro-geochemistry and sedimentary analysis of the high arsenic affected districts; Rautahat, Sarlahi, Parsa, and Kailali of Nepal.
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| 关 键 词： | 地下水 水体污染 砷 尼泊尔 沉积物 |
Groundwater pollution by arsenic concentration in sedimentary aquifers in the Indo-Gangetic Basin of Nepal |
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| Sunil Kumar Dwivedi Pusker Raj Joshi Sanjiv Shrestha Yaga Raj Bhandari Ram Bhadur Sah.Groundwater pollution by arsenic concentration in sedimentary aquifers in the Indo-Gangetic Basin of Nepal[J].Chinese Journal of Geochemistry,2006,25(B08):139-139. |
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| Abstract: | |
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| Keywords: | groundwater pollution arsenic Indo-Gangetic Basin Nepal |
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