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目的:建立测定痕量As(Ⅲ)的新方法。方法:在H2SO4介质中,KBrO3能氧化吖啶红(ADR),使其荧光猝灭,痕量As(Ⅲ)能灵敏阻抑该反应。结果:在最佳实验条件下,测定As(Ⅲ)的线性范围为0.015~0.450μg/ml,方法的检出限为2.1μg/L。对0.05μg/ml和0.15μg/ml的As(Ⅲ)标准溶液平行测定11次,其相对标准偏差分别为2.83%和2.31%。结论:用于环境样品中微量砷的测定,回收率在90.0%~107.2%之间,结果满意。
Objective: To establish a new method for the determination of trace As (Ⅲ). Methods: In H2SO4 medium, KBrO3 could oxidize acridine red (ADR) to quench its fluorescence, trace As (Ⅲ) could sensitively suppress the reaction. Results: Under the optimum conditions, the linear range of As (Ⅲ) was 0.015-0.450 μg / ml. The limit of detection was 2.1 μg / L. The relative standard deviations (RSDs) of As (Ⅲ) standard solution of 0.05μg / ml and 0.15μg / ml were determined in parallel for 11 times, respectively, 2.83% and 2.31%. Conclusion: The method was applied to the determination of trace arsenic in environmental samples with the recoveries between 90.0% and 107.2%. The results were satisfactory.