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"Heavy
metal" generally refers to a group of metal
elements which has more than five grams per cubic
centimeter density. Now about forty kinds are known.
Include: mercury,
gold, chromium, copper, cadmium, zinc, and lead.
Heavy
metals may enter the body through the diet, respiratory
or direct contact. Unlike other heavy metal toxin could
be catabolism in the liver and excreted. In
contrast, it is easy to accumulate in the brain, kidneys
and other organs, progressive damage to the normal
function of the body.
We
had recprded five kinds of heavy metal in our survey. |
Introduction
