吖啶红与铬(Ⅵ)的高灵敏度荧光反应及应用

Highly Sensitive Fluorescent Reaction of Acridine Red with Chromium(Ⅵ) and Its Application

研究了在硫酸介质中，铬（Ⅵ）氧化吖啶红荧光增强反应的最佳实验条件，建立了测定痕量铬（Ⅵ）的新的高灵敏度荧光分析法。该方法的检出限为0．6μg·L^-1，线性范围为2．0～32μg·L^-1，对含量为4．0和28μg·L^-1的Cr（Ⅵ）标准溶液进行11次平行测定，其相对标准偏差分别为2．0％和1．0％。该法用于电镀液、废铬酸洗液及合金钢中痕量铬（Ⅵ）的测定，与标准样品和二苯碳酰二肼分光光度法进行了对照，获得了满意结果。

A simple and highly sensitive fluorimetric method for the determination of Cr（Ⅵ） was developed in the present paper. The method is based on the fluorescence enhancement of acridine red with Cr（ Ⅵ ） in the sulfuric acid medium. The effects of some experimental conditions on the determination of Cr（Ⅵ） were investigated in detail. The detection limit for Cr（Ⅵ） is 0. 6 μg·L^-1 , and the linear range of the determination is 2. 0-32 μg·L^-1. The relative standard deviation of 11 replicate measure- ments is less than 2.0%. The proposed method has been successfully used to determine Cr（VI ） in electroplating solution, waste chromic acid mixture, and alloy steel samples. The results obtained were compared with the certified values of Cr（Ⅵ） in standard samples and those provided by 1,5-diphenylcarbazide method with satisfaction.