本文研究了新型显色剂对乙酰基偶氮胂的合成方法及其与钍显色反应的一些基本条件。在1N的盐酸溶液中,钍与对乙酰基偶氮胂的克分子吸光系数为1.0×10~5(UV-300型分光光度计)。试剂对U(Ⅵ)、Y~(3+)、Zr~(4+)、Al~(3+)、Mg~(2+)、Mn~(2+)、Cd~(2+)、PO_4~(3-)、SO_4~(2-)等干扰元素的允许量高于偶氮胂Ⅲ和对二甲基偶氮胂Ⅲ。钍与对乙酰基偶氮胂的对比 In this paper, the synthesis of acetylarsenazo and the basic conditions for the color reaction with thorium were studied. In 1N hydrochloric acid solution, the molar absorptivity of thorium and p-acetylarsanarsine is 1.0 × 10 -5 (UV-300 spectrophotometer). The effects of the reagents on the stability of U (Ⅵ), Y 3+, Zr 4+, Al 3+, Mg 2 +, Mn 2+, Cd 2+, PO 4 The allowable amounts of interfering elements such as ~ (3 -), SO_4 ~ (2-) were higher than those of arsenazo Ⅲ and p-dimethylarsenosine Ⅲ. Comparison of thorium with p-acetylarsenazo