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研究了显色剂三溴偶氮胂与铈的显色反应。结果表明:0.72mol/L H2SO4+0.9mol/L H3PO4溶液中,铈与三溴偶氮胂反应形成蓝色络合物,最大吸收波长为630nm,表观摩尔吸光系数为1.1×105 L/(mol.cm);25mL溶液中,铈量在0～30μg范围内符合比尔定律;方法可用于钼合金中铈的直接测定,相对标准偏差1.07%～2.20%,加标回收率为97%～101%。
The color reaction of tribromoarsenazo with cerium was studied. The results showed that the blue complex was formed by the reaction of cerium with tribromoarsenazo in 0.72 mol / L H2SO4 + 0.9 mol / L H3PO4 solution. The maximum absorption wavelength was 630 nm and the apparent molar absorptivity was 1.1 × 105 L / ( mol.cm). The Beer’s law was obeyed in 25mL solution with the amount of cerium in the range of 0-30μg. The method could be used for the direct determination of cerium in molybdenum alloys with the relative standard deviations (RSDs) of 1.07% ~ 2.20% and the recoveries of 97% ~ 101 %.