Human contact with metallic substances is virtually coextensive with the development of civilization. It is likely, for example, that metallurgy accompanied the earliest cultures of the Tigris and Euphrates rivers around 6000 B.C. Metallic ornaments discovered at Ur in Babylonia suggest that “the casting of copper, silver and gold . . . began around 3500 B.C.” (Marks & Beatty, 1975, p. 5). The Egyptians were working with lead as early as 3400 B.C.
KeywordsLead Level Lead Exposure Blood Lead Level Mercury Vapor Mercury Exposure
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