SENSITIVE SPECTROPHOTOMETRIC DETERMINATION OF VANADIUM WITH HYDROGEN-PEROXIDE AND 2-(5-CHLORO-2-PYRIDYLAZO)-5-DIMETHYLAMINOPHENOL AFTER EXTRACTION WITH N-BENZOYL-N-PHENYLHYDROXYLAMINE

Authors
ZUCCHI C FORNERIS M MARTINEZ L OLSINA R MARCHEVSKY E
Citation
C. Zucchi et al., SENSITIVE SPECTROPHOTOMETRIC DETERMINATION OF VANADIUM WITH HYDROGEN-PEROXIDE AND 2-(5-CHLORO-2-PYRIDYLAZO)-5-DIMETHYLAMINOPHENOL AFTER EXTRACTION WITH N-BENZOYL-N-PHENYLHYDROXYLAMINE, Fresenius' journal of analytical chemistry, 360(1), 1998, pp. 128-130
Citations number
12
Categorie Soggetti
Chemistry Analytical
Journal title
Fresenius' journal of analytical chemistry → ACNP
ISSN journal
09370633
Volume
360
Issue
1
Year of publication
1998
Pages
128 - 130
Database
ISI
SICI code
0937-0633(1998)360:1<128:SSDOVW>2.0.ZU;2-B
Abstract
A selective and precise spectrophotometric determination of vanadium(V ) is performed after preceding extraction with N-benzoyl-N-phenylhydro xylamine (BPHA). The color is developed in a water-ethanol solution wi th hydrogen peroxide and 2-(5-chloro-2-pyridylazo)-5-dimethylaminophen ol (5-Cl-DMPAP). The molar absorptivity at 588 nm is (6.57 +/- 0.05) x 10(4) L mol(-1) cm(-1) at pH 2.1. The method permits the determinatio n of vanadium (V) at trace levels in the presence of large amounts of other ions. It is applied to the determination of vanadium in aluminiu m (analytical reagent grade) and in human hair. High accuracy and prec ision is obtained.