Abstract
Gallacetophenone is proposed as a new specific reagent for the determination of tantalum in the presence of niobium. It gave an yellow colour with tantalum (pH 1.2–3.0) and orange-yellow to orange-red colour with niobium (pH 5.0–8.0). The limits of identification (and dilution) were 10 γ (1:104) and 0.5 γ (1:105) for tantalum and niobium pentoxides respectively. The reagent is specific for tantalum at pH 1.5. The absorption maxima for gallacetophenone were 215 and 280 nm. The maximum absorption for the tantalum and niobium complexes were 395 and 385 nm respectively. The effects of pH, time, ammonium oxalate and reagent on the absorbancy of tantalum complex were studied. The tolerance limits for other ions were determined. Beer’s law was obeyed in the range of 0.5–8.0 mg of tantalum pentoxide per 25 ml. Tantalum pentoxide could be determined colorimetrically in presence of ten times its weight of niobium pentoxide. Gallacetophenone formed 1:1 complex with tantalum (pH 1.5) and 1:2 complex with niobium (pH 6.4). The probable structures have been suggested.
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