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  1. Hydrogeological investigation of ground water arsenic contamination in South Calcutta.

    Article - En anglais

    Typical clinical symptoms of acute arsenic poisoning have been detected in 1000 residents near a factory in P.N. Mitra Lane, Behala, South Calcutta, located in a thickly populated area manufacturing copper acetoarsenite (Paris-Green) an arsenical pesticide for the past 25 years.

    Soil around the effluent dumping point of the factory was exceptionally contaminated, with arsenic, copper and chromium concentrations of 20100-35500 mg kg-1,33 900-51 100 mg kg-1 and 5300-5510 mg kg-1.

    Arsenic and copper concentrations in bore-hole soils collected up to a depth of 24.4 m at the effluent dumping point, decreased with depth.

    Arsenous acid, arsenic acid, methylarsonic acid (MA) and dimethylarsinic acid (DMA) were detected in bore-hole soils up to a depth of 1.37 m, after which only inorganic arsenical compounds were present.

    A positive correlation was established between arsenic and copper authenticated the Paris-Green waste disposal site as the source of contamination.

    Mechanism of ground water contamination from this disposal site had been probed by a systematic hydrogeological survey and the arsenic content of the tube-well waters in the surrounding areas.

    Hydraulic conductivity was maximum in the central part.

    The site for disposal of the effluent was a ditch located in the zone of discharge. (...)

    Mots-clés Pascal : Inde, Asie, Pollution eau, Eau souterraine, Nappe phréatique, Arsenic, Source pollution, Industrie chimique, Rejet eau usée, Pollution sol, Sol sableux argileux, Hydrogéologie, Phénomène transport, Eau potable, Calcutta, Contrôle lithologique

    Mots-clés Pascal anglais : India, Asia, Water pollution, Ground water, Ground water table, Arsenic, Pollution source, Chemical industry, Waste water discharge, Soil pollution, Sandy clay loam soil, Hydrogeology, Transport process, Drinking water

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 99-0125297

    Code Inist : 001D16A04B. Création : 16/11/1999.