Background
Arsenic is classified by the World Health Organisation as a group 1 human carcinogen. Drinking water is the main source of inorganic arsenic in humans. The WHO recommended limit is 10 µg/l. Lung, bladder and skin cancers can result from concentrations of 50 µg/l or more. Arsenic intake levels in Europe vary from 63 µg/day in England to 286  ...