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对硝基偶氮氯膦(简称CPA-PN)[2-(4-氯-2-膦酸基苯偶氮)-7-(4-硝基苯偶氮)-1,8-二羟基-3,6-萘二磺酸)是一种不对称变色酸双偶氮氯膦酸型显色剂,已知CPA-PN在盐酸介质中和钇具有声型显色反应,形成的络合物最大吸收在740nm,我们在研究CPA-PN与钇的显色反应时,发现CPA-PN对钍也有灵敏的颜色反应,其最大吸收在675nm处,为探求测定钍的新方法,本文就CPA-PN与钍显色反应的条件、络合物的组成、共存离子的影响及消除干扰的方法等进行了研究,并在此基础上,制定了CPN-PN测定钍的方法,所得结果令人满意。
P-Nitroazophosphonazo (CPA-PN) [2- (4-chloro-2-phosphonophenylazo) -7- (4- nitrophenylazo) -1,8-dihydroxy- 3,6-naphthalenedisulfonic acid) is an asymmetric chromotropic acid bis-chlorophosphonic acid-type developer. It is known that CPA-PN has an acoustic-type color reaction with yttrium in a hydrochloric acid medium to form a complex The maximum absorption at 740nm, when we studied the color reaction of CPA-PN with yttrium, we found that CPA-PN also has a sensitive color reaction to thorium with the maximum absorption at 675nm. In order to explore a new method for determination of thorium, CPA- PN and thorium color reaction conditions, the composition of the complex, the impact of coexistent ions and methods to eliminate interference, and on this basis, the determination of CPN-PN determination of thorium, the results are satisfactory .