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华东师大潘教麦等同志研究了钇和铈组稀土的灵敏显色剂——偶氮氯膦-P-NO_2,它在酸性溶液中与稀土离子形成蓝绿色络合物,并在一定量的草酸存在下,可在重稀土元素共存时测定钢铁中的轻稀土元素。而后又发现该试剂与钇有特征的β型反应(在过量试剂存在下),形成的络合物的最大吸收峰在730nm处,克分子吸光系数为9.56×10~4。此反应速度比偶氮氯膦Ⅲ与重稀土的β型反应快,而且稳定,可用于钇的测定。所以偶氮氯膦-P-NO_2是一种既能用于铈组稀土测定,又可用于钇的光度测定的优良显色剂。
East China Normal University Pan Jiaci and other comrades studied rare earth yttrium and cerium rare earth chromogenic reagent - chlorophosphonazo-P-NO_2, which in acidic solution with rare earth ions to form a blue-green complex, and in a certain amount In the presence of oxalic acid, light rare earth elements in steel can be determined when heavy rare earth elements coexist. It was then found that the reagent had a characteristic β-type reaction with yttrium (in the presence of an excess of reagent) and the maximum absorption peak of the complex formed was at 730 nm with an exopolymerization coefficient of 9.56 × 10 -4. The reaction rate than chlorophosphonazo Ⅲ and heavy rare earth β-type reaction fast, and stable, can be used for the determination of yttrium. Therefore, chlorophosphonazo-P-NO 2 is an excellent chromogenic agent that can be used both for the determination of rare earths in the cerium group and for the photometric determination of yttrium.