Why are chromium-6 and chromium-3 covered in the same standard?
These two forms of chromium can convert back and forth in water and in the human body, depending on environmental conditions. Measuring just one form may not capture all of the chromium that is present. In order to ensure that the greatest potential risk is addressed, EPA?s regulation assumes that the sample is 100% chromium-6, the more toxic form. For more information on chromium, please visit our Web site at the following URL: http://water.epa.gov/drink/contaminants/basicinformation/chromium.cfm
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