Studies On Extraction And Spectrophotometric Determination Of Molybdenum(v) Using N1-hydroxy-n1 Nz-diphenylbenzamidine And Thiocyanate

Molybdenum(V) has been found to react withrnNI-hydroxy-N1, NZ-diphenylbenzamidine (HDPBA) and thiocyanaternto form a reddish-orange complex which is quantitativelyrnextractable into 2.5 % (v/v) amyl alcohol in benzene from 4 -rn6 M hydrochloric acid solutions. The complex exhibited arnwavelength of maximum absorption at 470 nm with a molarrn-I -I absorptivity of 13100 M cm and the system obeyed Beer'srnlaw in the concentration range of 0.48 - 9.59 ppm of Mo. Therncomposition of the complex has been establishedrnspectrophotometrically to be 1:3:1 (Mo:SCN-:HDPBA). Therneffects of diverse ions and of several experimental variablesrnhave been studied to establish the optimum conditions forrnextraction and determination of molybdenum. On the basis ofrnthese studies a simple, precise, sensitive and a highlyrnselective method has been developed for the determination ofrnmolybdenum (V) by solvent extraction and spectrophotometry.rnThe method has been successfully applied to the determination of molybdenum in several synthetic samples corresponding tomolybdenum containing steels and ores.

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