DETERMINATION OF TRACE AMOUNTS OF VANADIUM WITH A NEW REAGENT ETHOXYSALICYLIDENEAMINO)-8-HYDROXY-3,6-NAPHTHALENE DISULFONIC ACID, DISODIUM SALT] BY FLUORESCENCE QUENCHING METHOD

A fluorescence quenching method is described for the determination of trace amounts of vanadium(V) based on the formation of a complex in ac idic medium with a new reagent ethoxysalicylideneamino)-8-hydroxy-3,6- naphthalene disulfonic acid, disodium salt]. The fluorescence emission is measured at 415 nm (wavelength of excitation 360 nm), and the expe rimental variables and interferences in this determination have been s tudied. The detection limit is 12.5 ng/ml and linear range is between 50 and 600 ng/ml. The method has been applied to determine trace vanad ium(V) in steel and cast iron.