A KINETIC DETERMINATION OF NANOGRAM AMOUNTS OF VANADIUM BY ITS CATALYTIC EFFECT
A new method is proposed for the determination of vanadium(IV) and vanadium(V). The method is based on their catalytic effect on the reaction of N-phenyl-p-phenylenediamine with N,N-dimethylaniline to form a green compound (λmax=735 nm) in the presence of bromate. The method is highly sensitive with a Sandell sensitivity of 1.3×10−3 ng cm−2 and useful for the analysis of vanadium in sea water.