(Cr) Toxicity | ATSDR - CSEM - Agency for Toxic Substances and ...

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Agency for Toxic Substances and Disease Registry Chromium Toxicity Case Studies in Environmental Medicine (CSEM) Environmental Protection Agency Air: environment Drinking water Not available Chromium is listed as a hazardous pollutant 100 μg/L Regulation; current MCL‡ for total chromium *TWA (time-weighted average): TWA concentration for a normal workday and a 40-hour workweek to which nearly all workers may be repeatedly exposed. †PEL (permissible exposure limit): highest level of chromium in air, to which a worker may be exposed, averaged over an 8-hour workday. ‡MCL (maximum contaminant level) enforceable level for drinking water. Key Points Progress Check • OSHA has established an 8-hour time-weighted average (TWA) exposure limit of 5 micrograms of Cr(VI) per cubic meter of air (5 μg/m³). This is a considerable reduction from the previous PEL of 52 μg/m³. • The current EPA maximum contaminant level for chromium in drinking water is 100 μg/L. 5. OSHA’s PEL for Cr(VI) (chromic acid and chromates) in the workplace is which of the following? A. 5 μg CrO3/m³. B. 10 μg CrO3/m³. C. 52 μg CrO3/m³. D. 100 μg CrO3/m³. To review relevant content, see “Table 1” in this section. Page 24 of 67
Agency for Toxic Substances and Disease Registry Chromium Toxicity Case Studies in Environmental Medicine (CSEM) Answers 5. The correct answer is A. OSHA has mandated PEL ceiling of 5 μg /m³ for chromic acid and chromates. Page 25 of 67
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