【摘要】 本文对铁（Ⅲ）与桑色素（Ｍｏｒｉｎ）的显色反应进行了研究。在非离子表面活性剂吐温－２０存在下，于ｐＨ４．１的邻苯二甲酸氢钾缓冲溶液中，铁（Ⅲ）与桑色素形成稳定的黄色配合物，其组成比为Ｆｅ（Ⅲ）∶Ｍｏｒｉｎ＝１∶３，最大吸收波长为４１８ｎｍ，表观摩尔吸光系数为６．６９×１０４Ｌ／ｍｏｌ·ｃｍ，铁（Ⅲ）浓度在０～１６μｇ／２５ｍｌ范围内符合比耳定律。方法简便、快速，选择性好。应用于环境水样和植物中微量铁的测定，结果满意。更多还原

【Abstract】 The colour reaction of Fe(Ⅲ) with 3,5,7,2’,4’ pentahydroxyflavone(Morin) has been studied. In a buffer solution of potassium hydrogenphthalate(pH4 1) and in the presence of non ionic surfactant Tween 20, Fe(Ⅲ) reacts with Morin to form a stable yellow complex with composition ratio of Fe(Ⅲ)/Morin of 1∶3. The apparent molar absorptivity is 6 69×10 4L/mol·cm at 418nm. Beer’s law is obeyed in the range of 0～16μg/25ml for Fe(Ⅲ). The method has been applied to the determination of Fe in environmental water samples and plant with satisfactory results.更多还原