A simple and sensitive extractive- spectrophotometric method for thedeterrnination
of trace amounts of vanadium(V) is reported. The method is based on the quantitative
extraction of the anion complex of V(V) with 4-(2-pyridy1azo)-resorcinol with
tetrabutylammonium perchlorate into chloroform, followed by spectrophotometric
measurements at 554 nm. Beer's law is obeyed over the concentration range of
5-350ng m l at 554 nm with a molar absorptivity of 1 . 3 1m ol cm . The relative standard deviation is 1.6% for a 100 ng ml vanadium solution. The interfering effect of various cations and anions was studied. The method was applied to thedeterrnination of vanadium is some synthetic samples