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目前,对稀土的光度测定提出了更高的要求,不仅要求能测定稀土的总量,而且还要解决混合稀土中的各组稀土(如铈组和钇组),甚至单个稀土元素的测定问题,但至今特别是对钇组稀土,仍缺乏较好的显色剂。文献曾报导偶氮氯膦Ⅲ与重稀土有特殊的β型吸收光谱反应,并可用于钇的测定,但显色时间较长,一般需一小时才能显色完全。我们在研究一系列不对称的双偶氮
At present, the photometric determination of rare earth presents higher requirements, not only required to measure the total amount of rare earth, but also to solve the mixed rare earth rare earth groups (such as cerium group and yttrium group), and even the determination of a single rare earth elements , But so far, especially for the yttrium group of rare earth, still lack the better developer. Literature has reported that chlorophosphonazo Ⅲ and heavy rare earths have a special β-type absorption spectrum reaction, and can be used for the determination of yttrium, but the color longer, usually takes an hour to develop color completely. We are working on a series of asymmetric disazo