Sensitive Determination of Hexavalent Chromium in Drinking Water Using a Compact Ion Chromatography System

Instrument Type: IC

This record demonstrates that the method in AU179 can be run successfully using an Integrion Ion Chromatography (IC) system. AU179 describes modification of the conditions described in EPA Method 218.6, including use of the column in the 2 mm format and a smaller reaction coil to increase method sensitivity. The modified method, which is now US EPA Method 218.7, uses a Dionex IonPac AS7 column (2 × 250 mm), a 1000 μL injection volume, and postcolumn reaction (using a 125 μL reaction coil) followed by visible absorbance detection at 530 nm.