Brief method summary:

A fixed volume of buffered and filtered sample, typically 100 mL, is injected into the eluant flow path and separated by anion exchange using an ammonium sulfate based eluant. After separation, the sample is reacted with an acidic solution of diphenylcarbohydrazide. Hexavalent chromium reacts selectively with this reagent to form the characteristic violet colored complex. The eluant stream passes through a photometric detector for detection of the chromium diphenylcarbohydrazide complex by visible absorbance at 530 nm. Absorbance is proportional to the hexavalent chromium concentration.

Scope and application:

This test method covers procedures for the determination of dissolved hexavalent chromium in waste water, surface water, and drinking water.

Applicable Conc Range     1-1000 ug/L