Cr(VI) is relatively mobile in the environment and is classified as Class A (knownrnhuman carcinogen). The USEPA currently regulates total chromium, containing both Crrn(III) and Cr (VI) species, at 100 μg L~(-1)rn. Due to the increasing evidence involving Cr (VI)rnhuman health risks, California has set a public health goal in drinking water of 0.02 μgrn~(L-1)rn. In December of 2010, the USEPA publicly stated future regulations for Cr (VI) willrnaddress the associated health risks. USEPA has encouraged public water systems tornmonitor Cr (VI) levels. Hexavalent chromium is of concern to many communities ofrnArizona; as drinking water supply generally comes from a mixture of groundwaterrnwells, canal water, and river water. To demonstrate fluctuating water quality, an ISCOrnsampler was used to monitor water quality at the Chandler, AZ Water Treatment Plantrn(WTP) over the course of 7 days. Grab samples were collected every four hours overrnthe course of the 7-dayrnperiod. Results showed that trace metal concentrationsrnranged significantly over this time period. The idea of a passive sampler is not new,rnbut the development of a passive sampler for applications within drinking waterrnmonitoring is unique.
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