铁是自然界中最常见的基本元素之一,对它的分析一直受到人们的高度重视,特别是分光光度法,由于操作简便,灵敏度高,因而研究报道较多。对乙酰基偶氮胂是一种优良的光度分析试剂,已用于钍、镍、铜、铝等元素的光度分析。本文系统的研究了该试剂与铁(Ⅲ)的显色反应条件及络合物的光度特性。结果表明,该显色反应稳定性好,灵敏度高,且具有良好的选择性,应用于铝合金及硅石中微量铁的测定,结果满意。 Iron is one of the most common basic elements in nature. Its analysis has always been highly valued by people. Especially, spectrophotometry has been widely reported due to its simple operation and high sensitivity. Acetylarsenazo is an excellent spectrophotometric reagent that has been used for the photometric analysis of thorium, nickel, copper, aluminum and other elements. This article systematically studied the reagent and iron (Ⅲ) color reaction conditions and the photometric properties of the complex. The results show that the color reaction has good stability, high sensitivity and good selectivity. It is applied to the determination of trace iron in aluminum alloy and silica with satisfactory results.