偶氮氯膦Ⅲ(简称CPAⅢ)是继偶氮胂Ⅲ后,测定稀土的又一灵敏显色剂。与偶氮胂Ⅲ相比它具有在更强酸性中能与稀土产生灵敏的显色反应和生成的络合物十分稳定等优点。 近年来采用CPAⅢ试剂测定稀土的光度法日渐增多,但多数只介绍Ce—CPAⅢ和Y—CPAⅢ络合物的吸收光谱、摩尔吸光系数,显色介质和酸度等研究结果,文献还报导了GPAⅢ—RE成络反应的机理和应用。 Chlorophosphonazo III (referred to as CPA Ⅲ) is arsenazo Ⅲ after the determination of rare earth another sensitive developer. Compared with the arsenazo III, it has the advantage of being able to produce a sensitive color reaction with rare earth in the stronger acidity and producing a stable complex. In recent years, the use of CPA Ⅲ reagent determination of rare earth photometric method is increasing, but most only introduce Ce-CPA Ⅲ and Y-CPA Ⅲ complexes absorption spectra, molar absorptivity, color medium and acidity and other research results, the literature also reported the GPA Ⅲ- Mechanism and Application of RE Complexation Reaction.