Environmental occurrence industrial production and use cadmium is a heavy metal of considerable environmental and occupational concern it is widely distributed in the earths crust at an average concentration of about 01 mg kg. A toxic heavy metal is any relatively dense metal or metalloid that is noted for its potential toxicity especially in environmental contexts the term has particular application to cadmium mercury lead and arsenic all of which appear in the world health organizations list of 10 chemicals of major public concern. Excessive levels of heavy metals can be introduced into the environment for example by industrial waste or fertilizers soil represents a major sink for heavy metals ions which can then enter the food chain via plants or leaching into groundwater. Heavy metals and the environment heavy metals constitute an extremely heterogenous group of elements generally differed in their chemical properties and biological functions heavy metals are kept under environmental pollutant classification because of their dangerous impacts on plants animals and people
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