Studies on the analytical chemistry of hafnium and zirconium. Part II. Fluorimetric determination of hafnium in the presence of zirconium by using quercetin

Abstract

Hafnium (greater than 0·3 per cent.) in hafnium-zirconium mixtures can be determined by measuring the fluorescence of the hafnium complexes with quercetin or morin in 57·5 per cent. perchloric acid. The zirconium complex with quercetin does not fluoresce, and that with morin fluoresces only weakly at this acidity. Iron, titanium, vanadium, uranium and molybdenum interfere.

A mechanism for the selective fluorescence reaction is suggested.