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What are heavy metals? August 10, 2006

Posted by healthyself in ADHD, Alzheimer's, Biological Dentistry, Blogroll, Blood Brain Barrier, Cell phone safety, Children's health, Definitions, Detoxification, Electromagnetic pollution, Electrosensitivity, ELF, EMF Research, EMF's, EMR, Environment, Health related, Heavy Metals, Learning, MCS, Men's Health, Women's Health.
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The term heavy metal may have various more general or more specific meanings.

According to one definition, heavy metals are a group of elements between copper and bismuth on the periodic table of the elements—having specific gravities greater than 4.0. Living organisms require trace amounts of some heavy metals, including cobalt, copper, manganese, molybdenum, vanadium, strontium, and zinc, but excessive levels can be detrimental to the organism. Other heavy metals such as mercury, lead and cadmium have no known vital or beneficial effect on organisms, and their accumulation over time in the bodies of mammals can cause serious illness. The pathway for toxic effects on humans is normally: (i) for the entry of heavy metals into the atmosphere as industrial stack gas; (ii) or to enter the soil as a soil contaminant; (iii) or to enter groundwater as a water pollutant; or to be deposited in ocean bottoms or bay mud, which materials at a later time be dredged to the surface.

http://en.wikipedia.org/wiki/Heavy_metals

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