Method SM 3500-Cr B
The colorimetric method is useful for the determination of hexavalent chromium in a natural or treated water in the range from 100 to 1000 ug/L. This range can be extended by appropriate sample dilution or concentration and/or use of longer cell paths.
This procedure measures only hexavalent chromium, (Cr6+). For total chromium determination, acid-digest the sample and follow with a suitable instrumental analysis technique. The hexavalent chromium is determined colorimetrically by reaction with diphenylcarbazide in acid solution. A red-violet colored complex of unknown composition is produced. The reaction is very sensitive.
-Standard Methods Online – Standard Methods for the Examination of Water and Wastewater
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