Sensitive spectrophotometric determination of vanadium with hydrogen peroxide and 2-(5-chloro-2-pyridylazo)-5-dimethylaminophenol after extraction with N-benzoyl-N-phenylhydroxylamine |
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Authors: | C Zucchi M Forneris L Martínez R Olsina and E Marchevsky |
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Institution: | (1) Department of Analytical Chemistry, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, P.O.Box 375, 5700 San Luis, Argentina, AR |
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Abstract: | A selective and precise spectrophotometric determination of vanadium(V) is performed after preceding extraction with N-benzoyl-N-phenylhydroxylamine
(BPHA). The color is developed in a water-ethanol solution with hydrogen peroxide and 2-(5-chloro-2-pyridylazo)-5-dimethylaminophenol
(5-Cl-DMPAP). The molar absorptivity at 588 nm is (6.57 ± 0.05) × 104 L mol–1 cm–1 at pH 2.1. The method permits the determination of vanadium (V) at trace levels in the presence of large amounts of other
ions. It is applied to the determination of vanadium in aluminium (analytical reagent grade) and in human hair. High accuracy
and precision is obtained.
Received: 18 April 1997 / Revised: 20 June 1997 / Accepted: 25 June 1997 |
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