extractive-spectrophotometric determination of vanadium(v) as an ion-association complex with 4-(2-pyridylaz0)-resorcinoaln d tetrabutylammonium perchlorate

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