Heavy metal toxicity of drinking water: A silent killer

Heavy metal toxicity has proven to be a major threat and there are several health risks associated with it. The toxic effects of these metals, even though they do not have any biological role, remain present in some or the other form harmful for human body its proper functioning. metals generally referred as those which possess specific density more than 5 g/cm3 adversely affect environment living organisms. These essential maintain various biochemical physiological functions organisms when very low concentrations, however become noxious exceed certain threshold concentrations. most commonly found heavy waste water include arsenic, cadmium, chromium, copper, lead, nickel, zinc, all cause environment. enter surroundings by natural means through activities. Various sources soil erosion, weathering earth's crust, mining, industrial effluents, urban runoff, sewage discharge, insect disease control agents applied crops etc. Some i.e. mercury, aluminium causes drastic effect on organisms, mainly beings.