EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF MOLYBDENUM(V) WITH OPHENYL)-N1-HYDROXY-N2-(O-METHYLPHENYL)BENZAMIDINE HYDROCHLORIDE AND THIOCYANATE

A highly selective method has been developed for the extraction and sp ectrophotometric determination of molybdenum(V) using ophenyl)-N1-hydr oxy-N2-(o-methylphenyl)benzamidine hydrochloride and thiocyanate. The reagent reacts with molybdenum(V) in the presence of thiocyanate ion a nd forms orange red complex in strongly acidic medium. Which can be ex tracted with benzene. The extract shows a sharp maximum at 470 nm, hav ing molar absorption coefficient 3770 cm3 mol-1 cm-1. The system obeys Beer's law from 3 to 22 ppm. A large number of metal ions associated with matrix of Mo, such as Ni, Co, Cu, V, Nb, Ti, Zn, etc. do not inte rfere with the determination. The applicability of the method has been tested with various alloys. The stoichiometry of mixed complex is fou nd to be 1:2:2 (metal: reagent : thiocyanate).