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
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0125297
Code Inist : 001D16A04B. Création : 16/11/1999.