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Case Study: Chromium Toxicity Risk Management

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A Case Study in Cr(VI) Risk Management Abstract A metal finishing company suspected chromium trioxide contamination related to the operation of a hard chrome plating bath. The investigation revealed a ventilation hood motor for one of the baths had begun to fail. After cleanup of contaminated surfaces, and repair of the hood motor, additional engineering controls were installed to prevent or minimize a similar adverse event from occurring in the future. These controls include the installation of hood airflow gauges and alarms on all critical chemical ventilation systems. This report provides background on why chromate compounds are classified as a toxin and carcinogen and the remedial steps taken to resolve the contamination and amend the standing risk management strategy. Introduction Trivalent chromium [Cr(III)] is the most common form of chromium in the environment and has been shown to be required for glucose metabolism (Hayes, 2007, p. 847-848). Consistent with its biological role, Cr(III) is generally considered non-toxic at low concentrations and non-carcinogenic at any concentration. In contrast, hexavalent chromium [Cr(VI)] is a known toxin and carcinogen at low concentrations and has been classified as a Group A human carcinogen by the EPA (Environmental Protection Agency) (reviewed by Felter and Dourson, 1997). First discovered in 1798 as lead chromate (PbCrO4) (OSHA, 2006), Cr(VI) is derived from chromite ore (FeCr2O4) and has become an essential

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