Hexavalent chromium (chromium VI) is a common form of chromium, a metallic element, that can exist in natural waters in concentrations ranging from 1 to 100 ug/L.
WHY IS IT IMPORTANT?
Chromium VI is an important water quality parameter to monitor in drinking water as it is a known carcinogen for humans. Chromium VI is released in small amounts from rocks and soils, however it can also be released from anthropogenic sources such as industrial pollution. The EPA currently has a maximum contaminant level (MCL) for total chromium species (Cr(III) plus Cr(VI)) of 100 µg/L (0.1 mg/L).
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