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在H2SO4介质中,KIO4氧化吖啶黄,使体系褪色并伴随荧光猝灭,痕量的As(Ⅲ)能显著阻抑此反应,据此建立了一种新的荧光法测定痕量As(Ⅲ)。本文对该体系的实验条件进行了详细研究。在最佳条件下,方法的线性范围为5.0～400μg/L,检出限为2.4μg/L。方法已用于环境水样中痕量As(Ⅲ)的测定,加标回收率为94.2%～102.6%。
In H2SO4 medium, KIO4 oxidized acridine yellow, causing the system to fade and accompanied by fluorescence quenching. Trace amounts of As (Ⅲ) significantly inhibited the reaction. A new fluorescence spectrophotometry for the determination of trace As (Ⅲ) ). In this paper, the experimental conditions of the system were studied in detail. Under the optimum conditions, the linear range of the method was 5.0-400μg / L with the detection limit of 2.4μg / L. The method has been applied to the determination of trace As (Ⅲ) in environmental water samples with recoveries of 94.2% -102.6%.