Nordic symposium on trace elements in human health and disease. Leon NOR, 1994/06/19.
In six districts of West Bengal arsenic has been found in ground water above the maximum permissible limit recommended by the WHO of 0.05 mg l-1.
This water is used by the villagers fordrinking, cooking and other household purposes.
These six districts have an area of 34 000 km2 and hold a population of 30 million.
Over the last five years we have surveyed only a few small areas of these six affected districts and our survey revealed that, at present, at least 800000 people from 312 villages in 37 block are drinking contaminated water and more than 175 000 people are showing arsenical skin lesions that are the late stages of manifestation of arsenic toxicity.
Most of the three stages of arsenic-related clinical manifestations are observed amongst the affected people.
The common symptoms are conjunctivitis, melanosis, depigmentation, keratosis and hyperkeratosis ; cases of gangrene and malignant neoplasms are also observed.
The source of arsenic is geological.
We have analysed thousands of arsenic contaminated water samples.
Most of the water samples contain a mixture of arsenite and arsenate and in none of them could we detect methylarsonic or dimethylarsinic acid.
We have also analysed a large number of urine, hair and nail samples, several skin-scales and some liver tissues (biopsy samples) of the people drinking the arsenic contaminated water and showing arsenical skin lesions.
Mots-clés Pascal : Contamination, Eau potable, Pollution origine naturelle, Inde, Asie, Analyse quantitative, Spectrométrie absorption atomique, Epidémiologie, Taux, Cheveu, Ongle, Urine, Foie, Sinistre
Mots-clés Pascal anglais : Contamination, Drinking water, Natural origin pollution, India, Asia, Quantitative analysis, Atomic absorption spectrometry, Epidemiology, Rate, Hair (head), Nail(anatomy), Urine, Liver, Disaster
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0245940
Code Inist : 002B03H. Création : 09/06/1995.