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文献报导,BPR在H_2O_2存在下能与钽生成紫蓝色化合物。我们发现,在酒石酸和EDTA存在下,Ta(V)与BPR和CTAB也可生成紫蓝色络合物,且草酸可掩蔽一定量的铌。在此基础上研究制定了测定钢中钽的光度法。在620毫微米下测得络合物克分子吸收系数为1.10×10~5。0—60微克Ta_2O_5/50毫升符合比尔定律。 (一)主要试剂 1.钽标准溶液:称取Ta_2O_5(99％以上),用焦硫酸钾熔融和25％酒石酸浸取熔块的方法配制成每毫升含200微克Ta_2O_5
It has been reported in the literature that BPR can form violet-blue compounds with tantalum in the presence of H 2 O 2. We have found that Ta (V) and BPR and CTAB can also form violet-blue complexes in the presence of tartaric acid and EDTA, and oxalic acid can mask a certain amount of niobium. On this basis, the study developed a method for the determination of tantalum in steel. The molar absorptivity of the complexes measured at 620 nm is 1.10 × 10 ~ 5.0-60 μg Ta_2O_5 / 50 ml, which is in accordance with Beer’s law. (A) the main reagent 1 tantalum standard solution: Weigh Ta_2O_5 (99% or more), with potassium pyrophosphate and 25% tartaric acid leaching frit prepared per milliliter containing 200 micrograms Ta_2O_5