本文研究了钪—偶氮氟膦Ⅲ—溴化正辛基吡啶三元体系的光度特性,并确定了在该体系中以β型钪配合物进行测定的最佳条件。该体系的显色酸度pH1.0,配合物的摩尔吸光系数为3.08×10~41·mol~(-1)·cm~(-1),大多数共存物质的允许量均较相应的二元体系为高。据此提出了测定钪的新方法,并用于铜基合成试样的测定,结果较为满意。 In this paper, the photometric properties of scandium-azo-fluorophosphine Ⅲ-n-octylpyridinium ternary system were studied and the optimum conditions for the determination of β-scandium complexes in this system were established. The chromogenic acidity of the system was pH1.0 and the molar absorptivity of the complex was 3.08 × 10 ~ 41 · mol -1 (-1) cm. The allowable amount of most coexisting materials was more than the corresponding binary System is high. Based on this, a new method for scandium determination was proposed and used for the determination of copper-based composite samples. The results were satisfactory.