Browsing by Author "Wondirau, Taddese"

Now showing 1 - 1 of 1
  • No Thumbnail Available
    Item
    Studies on Extraction and Spbctrophotometric Determination Op Kiqbium(V) Using N-4-Chl0r0phenylcinnamohydroxamic Acid and Thiocyanate
    (Addis Ababa Universty, 1989-06) Wondirau, Taddese; Br.B.S. Chandravanshi
    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