Studies on Extraction and Spbctrophotometric Determination Op Kiqbium(V) Using N-4-Chl0r0phenylcinnamohydroxamic Acid and Thiocyanate
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Date
1989-06
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Addis Ababa Universty
Abstract
Niobium(TT)N has been found to react with. N-4-chlorophenylcinnamohydroxamic
acid(CPCHA) and thiocyanate to form
a golden yellow mixed ligand complex which is quantitatively
extractable into chloroform from 5*5-6« 5^1 hydrochloric acid
solutions. The complex exhibited a wavelength of maximum
absorption at 568 nm with a molar absorptivity of 47500M~icm
and the system obeyed Beer's lav/ in the concentration
range of 0«177~2.73 ppm of Nb, The composition of the complex
has been established spectrophotometrically to be
1:1:2(Nb:SCN“:CFCHA). The effects of diverse ions and of
several other experimental variables have been studied to
establish the optimum conditions for extraction and determination
of niobium. On the basis of these studies a simple,
precise, sensitive, and a highly selective method has been
developed for the , determination of niobium(V) by solvent
extraction and spectrophotometry,, The method has been nsuccessfully applied to the determination of niobium in
several synthetic samples corresponding to niobium contain
ing Ores, minerals, and alloys
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Keywords
N-4-Chlorophenylcinnamohydroxaraic Acid