AN1116 (a) Determination of Hexavalent Chromium Cr(VI) in Drinking Water by Suppressed Conductivity Detection using Dionex IonPac AS11-HC-4µm column.

Instrument Type: IC

Chromates are oxyanions of chromium in the oxidation state of +6. All Cr(VI) compounds are strong oxidizing agents that are considered toxic and potentially carcinogenic. The method described here uses suppressed conductivity detection for the determination of Cr(VI) in drinking water, thus eliminating the post column derivatization used in EPA Methods 218.6 and 218.7. This new approach uses either the Dionex IonPac AS11-HC or AS11-HC-4μm column to separate chromate from other anions in HIW. Even in the challenging HIW sample, the method can easily detect and quantify 2 μg/L Cr(VI).