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Hexavalent chromium (chromium(VI), Cr(VI), chromium 6) is any chemical compound that contains the element chromium in the +6 oxidation state (thus hexavalent). [1] It has been identified as carcinogenic, which is of concern since approximately 136,000 tonnes (150,000 tons) of hexavalent chromium were produced in 1985. [ 2 ]
Chromium toxicity refers to any poisonous toxic effect in an organism or cell that results from exposure to specific forms of chromium—especially hexavalent chromium. [1] Hexavalent chromium and its compounds are toxic when inhaled or ingested. Trivalent chromium is a trace mineral that is essential to human nutrition.
The permissible exposure limit (PEL or OSHA PEL) is a legal limit in the United States for exposure of an employee to a chemical substance or physical agent such as high level noise. Permissible exposure limits were established by the Occupational Safety and Health Administration (OSHA). Most of OSHA's PELs were issued shortly after adoption of ...
Chromium, especially hexavalent chromium, is highly toxic to fish because it is easily absorbed across the gills, readily enters blood circulation, crosses cell membranes and bioconcentrates up the food chain. In contrast, the toxicity of trivalent chromium is very low, attributed to poor membrane permeability and little biomagnification. [137]
Chromium compounds are compounds containing the element chromium (Cr). Chromium is a member of group 6 of the transition metals. The +3 and +6 states occur most commonly within chromium compounds, followed by +2; charges of +1, +4 and +5 for chromium are rare, but do nevertheless occasionally exist. [3] [4]
OSHA is a small agency, given the size of its mission: with its state partners, OSHA has approximately 2,400 inspectors covering more than 8 million workplaces where 130 million workers are employed. In Fiscal Year 2012 (ending Sept. 30), OSHA and its state partners conducted more than 83,000 inspections of workplaces across the United States ...
In this compound, as in all chromates and dichromates, chromium is in a +6 oxidation state, commonly known as hexavalent chromium. It is a salt consisting of ammonium ions and dichromate ions. Ammonium dichromate is sometimes known as Vesuvian Fire , because of its use in demonstrations of tabletop "volcanoes". [ 2 ]
Chromium(VI) (Hexavalent chromium) compounds [note 2] Ciclosporin; Cyclophosphamide; 1,2-Dichloropropane; Diethylstilboestrol; Erionite; Ethanol in alcoholic beverages [4] Ethylene oxide; Etoposide alone, and in combination with cisplatin and bleomycin; Fluoro-edenite fibrous amphibole; Formaldehyde; Gallium arsenide; Lindane; Melphalan
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