First derivative spectrophotometric determination of uranium(VI) and vanadium(V) in natural and saline waters and some synthetic matrices using PAR and cetylpyridinum chloride

A first derivative spectrophotometric method has been developed for the simultaneous determination of uranium(VI) and vanadium(V) using 4-(2′-pyridylazo)resorcinol (PAR) in the presence of cetylpyridinium chloride (CPC) and EDTA. As a result of the addition of CPC, the first derivative spectra of vanadium showed two minima at 575 and 600 nm, the latter being found to be more useful in its determination. Calibration graphs based on first...