离子交换分离-DSPCF吸光光度法测定氟钽酸钾中痕量铌

摘要

经磨细的氟钽酸钾试样,用氢氟酸、硝酸及热水溶解,制成40mL 0.2mol/L HF-1 mol/LHNO3液,流经阴离子交换分离钽,收集流出液以H2SO4、HClO4蒸干冒烟,用酒石酸浸出,以DSPCF显色进行测定,方法的表观摩尔吸光系数ε660nm=1.3×104,检测铌下限为0.0005%.