Study on Kinetic Fluorimetric Determination of Trace Vanadium

A new kinetic fluorimetric method has been proposed for the determination of trace vanadium.The method is based on the catalytic oxidation of acridine yellow with potassium bromate in a phosphoric acid medium.The fluorescence quenching of acridine yellow is determined by fixed time method.The optimal conditions of experimentation has been studied and chosen.The optimal reaction temperature is 100℃ in boiling water.The optimal reaction time is 8 minutes.Flowing cold water stops the reaction.The linear range of the determination are 0 02-0 2 μg·L -1 and 0 2-2 0 μg·L -1 V(Ⅴ).The detection limit for vandium is 0 006 μg·L -1 .The proposed method suffers no interference from more than 20 foreign ions.It has high sensitivity and selectivity.The method has been applied to determine trace vanadium in water samples with satisfactory results.