R. Belcher, T. Ramakrishna, T. S. West
Nov 1, 1962
Citations
0
Influential Citations
14
Citations
Journal
Talanta
Abstract
Abstract The reagent 4-(2-pyridylazo) resorcinol, PAR, in the presence of EDTA, gives a colour reaction with quinquevalent niobium which is not interfered with by any of the metals which normally accompany niobium. Of some 30 cations examined, only uraniumVI and vanadiumV interfere seriously. The reaction provides a sensitive method for the spectrophotometric determination of niobium, and is also applicable as a spot-test for amounts of niobiumV down to 0.1 μg. Even tantalum does not interfere when present in twenty-fold amounts, provided sufficient tartrate ion is added.