Croatica Chemica Acta, Vol. 51 No. 4, 1978.
Original scientific paper
N-p-Chlorophenyl-2-thenohydroxamic Acid a Sensitive Reagent for Spectrophotometric Determination of Vanadium
Ku. Rama Pande
; Department of Chemistry, Ravishankar University, Raipur 492 002, India
S. G. Tandon
; Department of Chemistry, Ravishankar University, Raipur 492 002, India
Abstract
The solvent extraction and spectrophotometric determination
of vanadium(V) with N-p-chlorophenyl-2-thenohydroxamic acid
(CPTHA) is described. The absorption spectrum of the vanadium(V)-
CPTHA extracts in chloroform, from 4 mol/dm3 hydrochloric acid
has its absorbance maximum at 530 nm; the reagent being colourless
does not absorb at this wavelength. The coloured system obeys
Beer's law over a wide range. The molar absorptivity in terms of
vanadium is 5500 dm3 mo1-1 cm-1 at 530 nm. The optimum acid range
for quantitative extraction of the chelate is 3 to 9 mol/dm3 hydrochloric
acid. The method is free from the interference of iron(III)
and several other alloying elements which are often associated with
vanadium. The method has been successfully used for determination
of vanadium in BCS steels.
Keywords
Hrčak ID:
195941
URI
Publication date:
8.2.1979.
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