( ter containing arsenic do not pose huma...)Arsenic in drinking water,Health

ter containing arsenic do not pose human health risk.
Chelation therapy may be effective in acute poisoning but should not be used against long-term poisoning.
The most important remedial action is prevention of further exposure by providing safe drinking- water. The cost and difficulty of reducing arsenic in drinking-water increases as the targeted concentration lowers. It varies with the arsenic concentration in the source water, the chemical matrix of the water including interfering solutes, availability of alternative sources of low arsenic water, mitigation technologies, amount of water to be treated, etc.
Control of arsenic is more complex where drinking-water is obtained from many individual sources (such as hand-pumps and wells) as is common in rural areas. Low arsenic water is only needed for drinking and cooking. Arsenic-rich water can be used safely for laundry and bathing. Discrimination between high-arsenic and low-arsenic sources by painting the hand-pumps (e.g. red and green) can be an effective and low cost means to rapidly reduce exposure to arsenic when accompanied by effective health education.
Alternative low-arsenic sources such as rain water and treated surface water may be available and appropriate in some circumstances. Where low arsenic water is not available, it is necessary to remove arsenic from drinking-water.
The technology for arsenic removal for piped water supply is moderately costly and requires technical expertise. It is inapplicable in some urban areas of developing countries and in most rural areas world-wide.
New types of treatment technologies, including co-precipitation, ion exchange and activated alumina filtration are being field-tested. There are no proven technologies for the removal of arsenic at water collection points such as wells, hand-pumps and springs. Simple technologies for household removal of arsenic from water are few and have to be adapted to, and proven sustaina
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