Croatica Chemica Acta, Vol. 54 No. 1, 1981.
Original scientific paper
Spectrophotometric Studies on the Vanadium(V)-Chelates with N-Arylhydroxamic Acids. A Superior Method for the Extraction and Spectrophotometric Determination of Vanadium in Steels
D. R. Agrawal
; Department of Chemistry, Ravishankar University, Raipur - 492 002, India
S. G. Tandon
; Department of Chemistry, Ravishankar University, Raipur - 492 002, India
Abstract
The reaction of 18 N-arylhydroxamic acids ·with V{V) in
different acidities and under varying experimental conditions
have been investigated. In concentrated HCl an intensely violet
chelate of V(V), which is readily extracted into chloroform, is formed.
The substitution in the hydroxamic acid functional grouping
affects the hue and spectral characteristics of the V(V)-chelates.
It is inferred that N-p-Cl-phenyl-p-methoxybenzohydroxamic
acid retains all the useful features of N-phenylbenzohydroxamic
acid as a reagent for V(V) but surpasses it in sensitivity and selectivity
of the reaction.
With this quick method vanadium has been determined in
analysed steels without the recourse of masking agents or prior
separations. The excellent results obtained on these samples are
taken as a proof of the reliability, precision and accuracy of the
method.
Keywords
Hrčak ID:
194434
URI
Publication date:
15.3.1981.
Visits: 728 *