( sure the first changes are usually obs...)Arsenic in drinking water,Health

sure, the first changes are usually observed in the skin: pigmentation changes, and then thickening of skin ( hyperkeratosis).
Long-term exposure to arsenic via drinking-water causes cancer of the skin, lungs, urinary bladder, and kidney.
Increased risks of lung and bladder cancer and of arsenic-associated skin lesions have been observed at drinking-water arsenic concentrations of less than 0.05 mg/L.
Chronic arsenic poisoning,as occurs after long-term exposure through drinking- water is very different to acute poisoning.
Cancer is a late phenomenon, and usually takes more than 10 years to develop.
The symptoms and signs that arsenic causes, appear to differ between individuals, population groups and geographic areas. Thus, there is no universal definition of the disease caused by arsenic.Similarly, there is no method to identify those cases of internal cancer that were caused by arsenic from cancers induced by other factors.
The relationship between arsenic exposure and other health effects is not clear-cut. For example, some studies have reported hypertensive and cardiovascular disease, diabetes and reproductive effects.
Exposure to arsenic via drinking-water has been shown to cause a severe disease of blood vessels leading to gangrene in China (Province of Taiwan), known as ‘black foot disease’. This disease has not been observed in other parts of the world, and it is possible that malnutrition contributes to its development. However, studies in several countries have demonstrated that arsenic causes other, less severe forms of peripheral vascular disease. According to some estimates, arsenic in drinking-water will cause 200,000 – 270,000 deaths from cancer in Bangladesh alone (NRC, 1998; Smith, et al, 2000).

Prevention And Control
Absorption of arsenic through the skin is minimal and thus hand-washing, bathing, laundry, etc. with wa
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