A decade of investigations on groundwater arsenic contamination in Middle Ganga Plain, India

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• 作者：Dipankar Saha ; Sudarsan Sahu
• 关键词：Gangetic Plains ; Middle Ganga Plain ; Groundwater ; Shallow aquifer ; Arsenic ; Contamination ; India
• 刊名：Environmental Geochemistry and Health
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：38
• 期：2
• 页码：315-337
• 全文大小：3,610 KB
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• 作者单位：Dipankar Saha (1)
  Sudarsan Sahu (2)
  
  1. Central Ground Water Board, Bhujal Bhawan, NH-IV, Faridabad, India
  2. Central Ground Water Board, MER, Patna, India
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geochemistry
  Atmospheric Protection, Air Quality Control and Air Pollution
  Public Health
  
• 出版者：Springer Netherlands
• ISSN：1573-2983

文摘

Groundwater arsenic (As) load in excess of drinking limit (50 µg L−1) in the Gangetic Plains was first detected in 2002. Though the menace was known since about two decades from the downstream part of the plains in the Bengal Basin, comprising of Lower Ganga Plain and deltaic plains of Ganga–Brahmaputra–Meghna River system, little thought was given to its possible threat in the upstream parts in the Gangetic Plains beyond Garo-Rajmahal Hills. The contamination in Bengal Basin has become one of the extensively studied issues in the world and regarded as the severest case of health hazard in the history of mankind. The researches and investigations in the Gangetic Plains during the last decade (2003–2013) revealed that the eastern half of the plains, also referred as Middle Ganga Plain (MGP), is particularly affected by contamination, jeopardising the shallow aquifer-based drinking water supply. The present paper reviews researches and investigations carried out so far in MGP by various research institutes and government departments on wide array of issues of groundwater As such as its spatio-temporal variation, mobilisation paths, water level behaviour and flow regime, configuration of contaminated and safe aquifers and their recharge mechanism. Elevated conc. of groundwater As has been observed in grey and dark grey sediments of Holocene age (Newer Alluvium) deposited in a fluvio-lacustrine environment in the floodplain of the Ganga and most of its northern tributaries from Himalayas. Older Alluvium, comprising Pleistocene brownish yellow sediment, extending as deeper aquifers in Newer Alluvium areas, is low in groundwater As. Similarities and differences on issues between the MGP and the Bengal Basin have been discussed. The researches point towards the mobilisation process as reductive dissolution of iron hydroxide coating, rich in adsorbed As, mediated by microbial processes. The area is marked with shallow water level (<8.0 m below ground) with ample monsoonal recharge. The infiltrated rainwater and percolating water from surface water bodies carry organic carbon from sediments (particularly from the clay plugs in abandoned channels), abetting microbial processes, spread of anoxic front and release of As.