Kinetic Spectrophotometric Determination of Vanadium (V) Using Ponceau S

Abstract

A sensitive and selective kinetic method is proposed for the determination of nanogram
amounts of vanadium (V). The method is based on the catalytic effect of vanadium (V) on the
oxidation of Ponceau S by hydrogen peroxide in acidic media. The rate of the reaction is
monitored spectrophotometrically at 520 nm. The method allows determination of vanadium (V)
concentrations in the range 2-400 ng mL-1 with a relative standard deviation of  2%. The
proposed method has been applied successfully for the determination of vanadium (V) in tap
water and wastewater samples.