An indirect amplification procedure for the determination of titanium by atomic-absorption spectroscopy

Abstract

Between 7 and 70 µg of titanium are determined by an amplification method whereby molybdotitanophosphoric acid is formed and extracted into butanol after removal of the excess of molybdophosphoric acid by prior extraction into a mixture of chloroform and butanol. The molybdenum-to-titanium combining ratio in molybdotitanophosphoric acid has been found to be 11:2. The eleven molybdate ions associated with each two titanium ions are determined by direct atomic-absorption spectroscopy of the molybdenum in a nitrous oxide-acetylene flame at 313·2 nm. The effect of large excesses of twenty-eight other ions has been investigated. Only niobium and tantalum interfere seriously. The sensitivity of this atomic-absorption amplification procedure (1 per cent. absorption) corresponds to 0·013 p.p.m.