【摘要】 本文研究了新显色剂邻羧基苯基偶氮桑色素与铁（Ⅲ）在ｐＨ５．６的缓冲溶液中的褪色反应，实验结果表明，利用此褪色反应测定铁（Ⅲ），其灵敏度高，表观摩尔吸光系数达３．１５×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，线性范围０～１．０μｇ／２５ｍＬ，检测限为：１．８×１０－１０ｇ／ｍＬ。应用于黑色食品中微量铁的测定，获得了满意的结果。更多还原

【Abstract】 The fading reaction of Fe(Ⅲ) with the new chromogenic reagent ortho carboxyl phenyl azo morin in a solution of pH 5.6 was studied.Experiments show that in the determination of Fe(Ⅲ) in this fading reaction,the molar absorptivity is 3.15×10 5 L·mol -1 ·cm -1 ,and the linear range is 0～1.0μg/25mL.Satisfactory results were obtained in the determination of trace Fe(Ⅲ) in black foods.更多还原