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chromium
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chromium

Hard, brittle, grey-white, metallic element, atomic number 24, relative atomic mass 51.996. It takes a high polish, has a high melting point, and is very resistant to corrosion. It is used in chromium electroplating, in the manufacture of stainless steel and other alloys, and as a catalyst. Its compounds are used for tanning leather and for alums. In human nutrition it is a vital trace element. In nature, it occurs chiefly as chrome iron ore or chromite (FeCr2O4). Kazakhstan, Zimbabwe, and Brazil are sources.

The element was named in 1797 by the French chemist Louis Vauquelin after its brightly coloured compounds.



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workers and several million more worldwide are exposed to Cr(VI) in the workplace, where chromium compounds (or chromates) serve as anticorrosion agents in protective coatings, as pigments in paints and plastics, and in chrome plating on tools, aircraft engine components, railroad wheel bearings, and automobile parts.
Mutagenic mix by Mead, M. Nathaniel / Environmental Health Perspectives
Hexavalent chromium compounds are widely used in the industry as ingredients and catalysts in pigments, metal plating and chemical synthesis.
OSHA issues final rule on hexavalent chromium exposure limit by Modern Casting
Louis Bay, would be likely to accumulate in oysters near the bay than in sediments because soluble chromium compounds would be expected to precipitate or complex with fine particles that are ingested by filter-feeding oysters.
Dioxin and heavy-metal contamination of shellfish and sediments in ... by Rensel, Jack E. / Journal of Shellfish Research
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