The main threats to human health from heavy metals are associated with exposure to lead,
cadmium, mercury and arsenic. Exposure to arsenic is mainly via intake of food and drinking
water, food being the most important source in most populations. Although adverse health
effects of heavy metals have been known for a long time, exposure to heavy metals
continues and is even increasing in some areas. Long-term exposure to arsenic in drinking-
water is mainly related to increased risks of skin cancer, but also some other cancers, as …