Chromium Speciation in Water by HPLC/ICP-MS
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چکیده
Chromium exists primarily in two forms: trivalent and hexavalent. Trivalent chromium is present in the cationic form as Cr+3 and is an essential nutrient, but hexavalent chromium is toxic and exists as an anion, either as chromate (CrO4 -2) or dichromate (Cr2O7 -2). Therefore, the analysis of total chromium does not always provide a true indication of the effects of chromium present in a sample. For example, a high total chromium concentration may not be harmful if the majority is Cr+3. A more accurate assessment of the true effects of chromium can be gained by distinguishing trivalent and hexavalent species. As a result, chromium regulations have existed for some time for speciated analysis in water.
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