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2,4,6-三氯偶氮氯膦(TCCPA)作为优良的显色剂已应用于稀土和铋的测定。文献[3]也曾介绍在乙醇或丙酮介质中用3,4,5-三氯偶氮氯膦测定钍的条件,其显色酸度为0.1mol/L,ε_(681nm)=8.93—9.11×10~4。本文研究了在高酸度下有乙醇或乳化剂OP(以下简称OP)存在时TCCPA与钍的显色反应,考察了32种常见离子的影响,并将方法应用于实际试样的测定。实验表明,在乙醇或OP存在下,在3.2mol/L盐酸介质中,络合物的最大吸收波长分别
2,4,6-trichloro-chlorophosphonazo (TCCPA) as an excellent developer has been used for the determination of rare earth and bismuth. The literature [3] also introduced thorium in 3,4,5-trichloro-chlorophosphonazo in ethanol or acetone, the chromogenic acidity was 0.1mol / L, ε 681nm = 8.93-9.11 × 10 ~ 4. In this paper, the color reaction of TCCPA with thorium in the presence of ethanol or emulsifier OP (OP) under high acidity was investigated. The influence of 32 common ions was investigated and the method was applied to the determination of the actual sample. Experiments show that in the presence of ethanol or OP, 3.2mol / L hydrochloric acid medium, the maximum absorption wavelength of the complex, respectively