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含有一个分析功能团的一类不对称的变色酸双偶氮衍生物是稀土的灵敏显色剂。如间羧基偶氮氯膦、间乙酰基偶氮氯膦、间硝基偶氮氯膦、对硝基偶氮氯膦、间(或对)甲酰基偶氮氯膦、间磺酸基偶氮氯膦等,已分别用于稀土总量、铈组稀土和钇的光度测定。我们进一步研究了此类试剂与钍、铀、铈的反应情况,发现在较高的酸度下,此类试剂中的间磺酸偶氮氯膦,不仅与钍有较灵敏的反应,而且对铀和铈的反应能力显著减弱,是一种灵敏度高、选择性较好的光度测定钍的新试剂。
A class of asymmetric chromotropic acid disazo derivatives that contain an analytical functional group are rare earth sensitizing developers. Such as carboxylazophosphonazohydrochloride, meta-acetylphosphonochlorophosphine, m-nitro-chlorophosphonazo, p-nitro-chlorophosphonazo, m- or p- Chlorophosphine, have been used for the total rare earth, cerium rare earth and yttrium photometric determination. We further investigated the reaction of these reagents with thorium, uranium, and cerium. We found that at higher acidity, the chlorosulfonates of these reagents not only react more sensitively with thorium, but also react with uranium And the ability to significantly reduce the reaction of cerium, is a high sensitivity, better selectivity of thorium new reagent photometry.