用间羧基偶氮氯膦─树脂相分光光度法测定钪

Determination of Trace Amounts of Scandium by Ion-Exchanger Phase Spectrophotometry with m-Carboxyl-Chlorophosphonazo

本文研究了间羧基偶氮氯膦（ＣＰＡｍＫ）在树脂相中与钪的显色条件。在盐酸介质中，以阴离子交换树脂吸附Ｓｃ－ＣＰＡｍＫ络阴离子。钪与试剂在０．０６ｍｏｌ／Ｌ盐酸介质中生成１：２的螯合物，在波长６７５ｎｍ处有最大吸收，表观摩尔吸光系数ε＝１４０×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。在５０ｍｌ溶液中，１－７μｇＳｃ／５０ｍｌ符合比耳定律，应用于合金中钪的直接测定，结果良好。

The reaction of CPAmK with scandium in resin phase has been studied. In 0.06mol/L hydrochloric acid medium, scandium reacts with the reagent to form a 1: 2 complex, which exhibits the maximal absorption at 675um with an apparent molar absorption coefficient of 1 .40×105 L· mol-1· cm-1. Beer's law is obeyed in the range of 1-7μgSc/50ml. The method has been applied successfully to determine scandium in alloys.