title: Spectrophotometric method for the determination of vanadium in uranium rich hydrogeochemical samples using pyridyl azo resorcinol (PAR).
abstract: A simple and precise method has been developed for the determination of traces of vanadium(V), using 4-(2 pyridyl azo) resorcinol, in natural water samples, containing very high concentrations of uranium. CDTA-pyrophosphate buffer has been used for masking interferants, including uranium which otherwise interferes above 125 ppb. The reaction of vanadium with PAR in the presence of buffer requires a waiting period of 45 min. The Sandell sensitivity of the method is 0.003 microg/ml, at 545 nm at an optimum pH of 6.5 +/- 0.2. The precision of the method is +/- 15% at the 100 ppb level of vanadium(V). The method has been successfully applied to a number of natural water samples during hydrogeochemical exploration.
authors.affiliation: Chemical Laboratory, Atomic Minerals Division, Department of Atomic Energy, Nagarbhavi, Bangalore 560072, India.
authors.forename: G
authors.initials: G
authors.lastname: Chakrapani
authors.forename: D S
authors.initials: DS
authors.lastname: Murty
authors.forename: B K
authors.initials: BK
authors.lastname: Balaji
authors.forename: R
authors.initials: R
authors.lastname: Rangaswamy