Abstract
A sensitive method for the spectrophotometric determination of niobium(V) based on the formation of its complex with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol in the presence of hydrogen peroxide has been developed. The molar absorptivity at 591 nm is 7.43×104 1 mol-1 cm-1 at pH 4.0+-1.0. This method becomes selective for niobium(V) after a preliminary extraction of its complex with α-benzoin oxime from 5–9 M hydrochloric acid, thus permitting the determination of traces of niobium in the presence of a large amount of other ions. It has been applied to the determination of niobium in materials of certified Nb content: steel and apatite samples.
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