title: Solid-phase spectrophotometric determination of trace amounts of vanadium at sub-ng/ml level with 4-(2-pyridylazo)resorcinol.
abstract: Solid-phase spectrophotometry has been applied to analysis for trace amounts of vanadium. Vanadium was sorbed in a styrene-divinylbenzene-type anion-exchanger Dowex 1-X8 as a vanadium-4-(2-pyridylazo)resorcinol complex. Resin phase absorbances at 562 and 800 nm were measured directly which allowed the determination of vanadium in the range of 0.1-2.4 ng/ml with a RSD of 1.5%. The method has been applied to the determination of vanadium in different samples, namely toadstool tissue, mussel tissue, petroleum crudes and swamp water.
authors.affiliation: Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, E-23071 Jaén, Spain.
authors.forename: M L
authors.initials: ML
authors.lastname: Córdova
authors.forename: A
authors.initials: A
authors.lastname: Molina-Díaz
authors.forename: M I
authors.initials: MI
authors.lastname: Pascual-Reguera
authors.forename: L F
authors.initials: LF
authors.lastname: Capitán-Vallvey