论文部分内容阅读
应用光度法测钍的显色剂报道不多,常见的为变色酸偶氮胂类显色剂,它们虽各有所长,但在具体应用上分别存在不足之处。本文探讨了某些不对称偶氮氯膦型衍生物与钍的显色反应,它们均能与钍生成蓝紫色稳定络合物,并通过多种比较表明,cpA-pB具有灵敏度高、对比度大、操作简便,许多常见离子在毫克级不干扰钍的测定等优点。特别在阳离子表面活性剂CTMAB存在下,由于胶束增敏作用;致使灵敏度提高三倍以上,而某些常见离子的允许量也超过显色剂与钍的二元体系,可望用于微量钍的测定。cpA-pB的化学名称为2-(4-氯-2-膦酸基苯偶氮)-7-(4-溴苯偶氮)-1.8-二羟基-3.6-萘二磺酸,其结构式
Thorium photometric method for the determination of chromogenic agents reported little, common for the chromogenic acid arsenazo developer, although they have their own strengths, but there are shortcomings in the specific application. In this paper, the chromogenic reactions of some asymmetric chlorophosphonated derivatives with thorium are discussed. Both of them can form blue-violet stable complexes with thorium. Through a variety of comparisons, cpA-pB has the advantages of high sensitivity and large contrast , Easy to operate, many common ions in mg level does not interfere with the determination of thorium and so on. Especially in the presence of cationic surfactant CTMAB, due to micellar sensitization; resulting in increased sensitivity of more than three times, and some common ions allowable amount of more than the binary system of the developer and thorium, is expected to be used for trace amounts of thorium The determination. The chemical name of cpA-pB is 2- (4-chloro-2-phosphonophenylazo) -7- (4-bromophenylazo) -1.8-dihydroxy-3.6-naphthalenedisulfonic acid,