APPLICATION OF 1-PHENYL-4-PHENYLAMINO-1,2,4-TRIAZOLIUM CHLORIDE TO DETERMINATION OF COBALT(2)

A new reagent, 1-phenyl-4-phenylamino-1,2,4-triazolium chloride, is proposed for the determination of cobalt(II) by extraction into 1,2-dichloro-ethane and spectrophotometric determination at 626 nm of the ion-association compound formed in the presence of an excess of ammonium thiocyanate. The composition of the species extracted has been determined by applying the continuous variation method to the aqueous-organic phase system, and by determining the chemical composition and molecular weight of the compound precipitated from the aqueous phase.