Flow-injection chemiluminescent determination of vanadium(IV) and total vanadium by means of catalysis on the periodate oxidation of purpurogallin.

A flow-injection chemiluminescent (CL) method is proposed for the successive determination of nanogram levels of vanadium(IV) and total vanadium. The method is based on the catalytic effect of vanadium(IV) on the oxidation of purpurogallin by periodate to produce light emission at 4 degrees C. The presence of hydrogen carbonate enhanced the light emission arising from the vanadium(IV)-catalyzed reaction.