Browsing by Author "Berhanu Belhu"

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    Studies on Extraction and Spectrophotometric Determination of Molybdenum(V) using N1-Hydroxy-N1, NZ-diphenylbenzamidine and Thiocyanate
    (Addis Ababa Universty, 1991-07) Berhanu Belhu; Chandravanshi B.S. (PhD)
    Molybdenum(V) has been found to react with NI-hydroxy-N1, NZ-diphenylbenzamidine (HDPBA) and thiocyanate to form a reddish-orange complex which is quantitatively extractable into 2.5 % (v/v) amyl alcohol in benzene from 4 - 6 M hydrochloric acid solutions. The complex exhibited a wavelength of maximum absorption at 470 nm with a molar -I -I absorptivity of 13100 M cm and the system obeyed Beer's law in the concentration range of 0.48 - 9.59 ppm of Mo. The composition of the complex has been established spectrophotometrically to be 1:3:1 (Mo:SCN-:HDPBA). The effects of diverse ions and of several experimental variables have been studied to establish the optimum conditions for extraction and determination of molybdenum. On the basis of these studies a simple, precise, sensitive and a highly selective method has been developed for the determination of molybdenum (V) by solvent extraction and spectrophotometry. The method has been successfully applied to the determination of molybdenum in several synthetic samples corresponding tomolybdenum containing steels and ores.