Mobility of arsenic in West Bengal aquifers conducting low and high groundwater arsenic. Part I: Comparative hydrochemical and hydrogeological characteristics - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Applied Geochemistry Année : 2008

Mobility of arsenic in West Bengal aquifers conducting low and high groundwater arsenic. Part I: Comparative hydrochemical and hydrogeological characteristics

Résumé

The present study demonstrates the importance of hydrogeochemical characteristics (groundwater flow and recharge) of an aquifer in the release of As to groundwater. The study area (not, vert, similar20 km2) is located in Chakdaha block, Nadia district, West Bengal, which hosts groundwaters of variable As content. The spatial distribution pattern of As is patchy with areas containing groundwater that is high in As (>200 μg L−1) found in close vicinity to low As (<50 μg L−1) groundwaters (within 100 m). The concentration of groundwater As is found to decrease with depth. In addition, the data shows that there is no conspicuous relationship between high groundwater As concentration and high groundwater abstraction, although the central cone of depression has enlarged over 2 a and is extending towards the SE of the study area. The river Hooghly, which forms the NW boundary of the study site, shows dual behaviour (effluent and influent during pre- and post-monsoon periods, respectively), complicating the site hydrogeology. The observed groundwater flow lines tend to be deflected away from the high As portion of the aquifer, indicating that groundwater movement is very sluggish in the As-rich area. This leads to a high residence time for this groundwater package, prolonging sediment-water interaction, and hence facilitating groundwater As release.

Domaines

Géochimie

Dates et versions

insu-00372034 , version 1 (31-03-2009)

Identifiants

Citer

Bibhash Nath, Doris Stuben, Sukumar Basu Mallik, Debashis Chatterjee, Laurent Charlet. Mobility of arsenic in West Bengal aquifers conducting low and high groundwater arsenic. Part I: Comparative hydrochemical and hydrogeological characteristics. Applied Geochemistry, 2008, 23 (5), pp.977 à 995. ⟨10.1016/j.apgeochem.2007.11.016⟩. ⟨insu-00372034⟩
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