Sensitive Determination of Hexavalent Chromium in Drinking Water

This application note presents modifications to the existing US EPA Method 218.6 to allow sufficient sensitivity for determining hexavalent chromium (i.e., Cr(VI) as CrO4 2-) at the proposed California PHG level of 0.02 μg/L. This includes the use of an IonPac AG7 guard (2 × 50 mm) and IonPac AS7 analytical (2 × 250 mm) columns while appropriately reducing the flow rates and reaction coil volume.