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本文研究了偶氮胂（Ⅲ）作萃取剂和显色剂，在ＰＥＧ－（ＮＨ４）２ＳＯ４－Ａｒｓｅｎａｚｏ（Ⅲ）体系中的非有机溶剂萃取光度法测定铀．将配合物从ｐＨ２．０（ＨＣｌ）溶液或ＨＣｌ—ＮａＡｃ缓冲溶液）水溶液中萃取至ＰＥＧ相，其最大吸收波长位于６５５ｎｍ，摩吸光系数为３．０×１０４Ｌ．ｍｏｌ－１．ｃｍ－１，Ｕ（ＶＩ）的线性范围为０－４．５μ／ｍｌ，轴与ＡｒｓｅｎａｚｏＣ（Ⅲ）的配位组成为１：１．将方法用于煤渣中铀的测定，获得了满意结果．
In this paper, arsenazo (Ⅲ) was studied as an extractant and a chromogenic reagent for the determination of uranium in non-organic solvent extraction PEG (NH4) 2SO4-Arsenazo (Ⅲ) system. The complex was extracted from the aqueous solution of pH 2.0 (HCl) or HCl-NaAc buffer solution into the PEG phase. The maximum absorption wavelength was at 655 nm and the absorption coefficient was 3.0 × 104 L. mol-1. cm -1. The linear range of U (VI) is 0-4.5μ / ml. The coordination of ArsenazoC (Ⅲ) with axis is 1: 1. The method was applied to the determination of uranium in coal cinder, and satisfactory results were obtained.