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The International Union of Pure and Applied Chemistry (IUPAC), which standardizes nomenclature, says "the term 'heavy metals' is both meaningless and misleading". The IUPAC report focuses on the legal and toxicological implications of describing "heavy metals" as toxins when no scientific evidence supports a connection. The density implied by the adjective "heavy" has almost no biological consequences, and pure metals are rarely the biologically active form.This characterization

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