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本文采用四苯砷氯盐酸盐于氢氟酸—硝酸介质中沉淀分离钽,焦硫酸钾熔融后用焦性没食子酸比色测定。分离完全,方法回收率高,适用于测定硬质合金中0.5—5％的钽量。沉淀分离条件:钽在氢氟酸浓度1—10M时沉淀完全。四苯砷氯盐酸盐(TPAC)用量在15—45毫升时钽回收率较好。根据TPAC的质量,我们采用25毫升。沉淀的洗涤液中需加入一定量的TPAC和保持一定的氢氟酸浓度,为便于
In this paper, tetraphenyl arsenic chloride hydrochloride in hydrofluoric acid - nitric acid precipitation precipitation of tantalum, potassium pyrosulfate melting with pyrogallol acid colorimetric determination. Separation is complete, high recovery rate, suitable for the determination of 0.5-5% of the amount of tantalum carbide. Precipitation separation conditions: tantalum hydrofluoric acid concentration 1-10M precipitation complete. Tetraphenol arsenic chloride hydrochloride (TPAC) in the amount of 15-45 ml tantalum recovery is better. Based on TPAC quality, we use 25 ml. Precipitation of the washing liquid to be added in a certain amount of TPAC and to maintain a certain concentration of hydrofluoric acid, for ease