Cadmium can be grouped in the following categories: the version from natural sources, in other words, report results from the natural mobilization of the natural cadmium from the crust and the crust of the Earth, such as volcanic activity and weathering of rocks; the current version of the human from the mobilization of cadmium impurities in raw materials such as phosphate minerals, fossil fuels and extracted, processed and recycled metals – particularly zinc and copper; the human version of the cadmium is used in products and processes, as a result of the use, processing, recycling, reclaiming, open burning or burned; the installed version of the city; and mobilization of cadmium release human and natural history of previously deposited in soils, sediments, landfills or waste-waste piles
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