Abstract：When phenylfluorone spectrophotometry is applied for the determination of Ta in ore sample, the coexisting elements such as Nb, Ti and Mo could also react with coloring agent, which had interference with the determination. The sample was decomposed with HF-HNO3-H2SO4 system. Nb was masked with oxalic acid, Ti was masked with H2O2, and Mo, Fe, V and Sn was reduced and masked with ascorbic acid and EDTA. The content of Ta was determined by phenylfluorone spectrophotometry with tartaric acid and cetyl trimethyl ammonium bromide as complexing agent in presence of surfactant polyvinyl alcohol. Consequently, the determination of Ta in ore sample was realized. The results showed that Beer’s law was obeyed for mass concentration of Ta in range of 0.02-1.0 μg/mL. The linear correlation coefficient was 0.999 1, and the detection limit was 0.02 μg/mL. The proposed method was applied to the determination of Ta in three certified reference materials including lithium ore, tantalum ore and rare earth ore. The results were basically consistent with the certified values, and the relative standard deviations (RSD, n=10) were between 6.9% and 8.5%. The proposed method was suitable for the determination of Ta in batch ore samples in field.
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