Studies on Extraction and Spectrophotometric Determination of Molybdenum(V) using N1-Hydroxy-N1, NZ-diphenylbenzamidine and Thiocyanate
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Date
1991-07
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Addis Ababa Universty
Abstract
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.
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Extraction and Spectrophotometric