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变色酸双偶氮氯膦类衍生物是稀土的一类重要显色剂。Taketatsu 等发现,偶氮氯膦Ⅲ仅能与重稀土发生α型和β型反应,这两种显色反应的影响因素及其规律性是多方面的。迄今钇组稀土和单一稀土的光度测定,尚无较适用的显色剂,而该类试剂与稀土离子的β型反应具有特殊的光度性质,从而为钇组稀土和单一稀土的测定提供了可能性。为此,我们以镧和钇为例,研究间硝基偶氮氯膦与稀土离子的β型显色反应,比较轻重稀土的β型反应行为,分析α、β型配合物工作曲线的特点,并为其应用提供参考。
Chromotropic acid disazo chlorophosphine derivatives are rare earth a class of important developer. Taketatsu et al. Found that chlorophosphonazo III only reacts with the heavy rare earth α and β type reactions, the two chromogenic reaction factors and their regularity is multifaceted. To date, there is no suitable chromogenic reagent for the determination of rare earths and rare earths in yttrium group. The β-type reaction between these reagents and rare earth ions has special photometric properties, which makes it possible to measure the rare earth and rare earth elements in the yttrium group Sex. For this reason, we use lanthanum and yttrium as examples to study the β-type color reaction between m-nitro-chlorophosphonazo and rare earth ions, compare the β-type reaction behavior of light and heavy rare earths, analyze the characteristics of the working curve of α and β- And provide reference for its application.