2.7 Heavy Metal (Heavy Metals) represents the heavy metal elements with atomic numbers in the range of
23 -92 in the period 5-7 in the periodic table, and specific gravity in the presence of 5 or more
on the heavy metals in the form of a pure element. slightly toxic But if in
some substances are very dangerous. Heavy metals are 68 elements, such as lead, mercury, cadmium, zinc, copper, nickel, chromium, iron, manganese, cobalt, arsenic and heavy metals in affecting the environment, most mercury, lead, cadmium, arsenic, humans have been heavy metals into. in the body May be due to the heavy metals
accumulate in the food chain and in biological processes. Humans may be consumed
directly into Or be exposed Or be indirectly often heavy metal contamination
in the sediments than in the water always. The sediments are mostly negative charge. The metal has a positive charge. Therefore it is better to cling together in the water.
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