随着稀土元素的应用日益广泛,不仅要求分析各种试样中的稀土总量,而且需要测定轻重稀土元素的分量。轻重稀土元素的分量,常在甲醇-硝酸介质中经阴离子交换分离后测定,也有用溶剂萃取或反相纸上色层等方法分组。这些方法有的对人体有害,有的操作流程较长。后又研究用偶氮硝羧发色,配合 EDTA-Zn 作钇组元素的掩蔽剂,可在钇组元素存在下测定轻稀土。但因此试剂的稳定性较差,故在推广应用中受到一定的限制。 With the increasing use of rare earth elements, not only requires the analysis of a variety of samples of rare earths, but also the determination of light and heavy rare earth elements. Light and heavy rare earth elements, often in the methanol - nitric acid medium after anion exchange separation measured, but also with solvent extraction or reverse color paper and other methods grouping. Some of these methods are harmful to the human body, and some operate longer. After the study with azo nitro-carboxy color, with EDTA-Zn as yttrium group masking agent element, in the presence of yttrium group element determination of light rare earth. However, the stability of the reagent is poor, so it is limited in popularization and application.