Abstract
A method for the determination of niobium in titanium by proton activation analysis was developed based on the reaction 93Nb(p,n) 93mMo. Molybdenum was radiochemically separated from the matrix activities (mainly scandium and vanadium) by anion-exchange chromatography and precipitation. The method was successfully applied to two BCR reference materials, CRM 90 (unalloyed titanium with added impurities of fifteen elements) and CRM 24 (pure titanium). The results obtained were 499 and 5.44 mg kg −1 for CRM 90 and CRM 24, respectively, with a precision of ca. 3%. The detection limit was 7 mg kg −1 without precipitation and 0.4 mg kg −1 with precipitation. Nuclear and spectral interferences were checked experimentally and found to be negligible.
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