光纤传感共振瑞利散射荧光法测定新疆黄芪中痕量砷

[目的]利用光纤传感共振瑞利散射荧光法测定中草药黄芪中痕量砷。[方法]将黄芪进行前处理,采用氢化物发生—催化,结合光纤传感,优化试验条件,共振瑞利散射光谱法测定砷含量。[结果]最佳试验条件为0.3 mol/L硫酸、0.9 mol/L Na BH4、0.2 mol/L Na BH4。方法学考察显示,该方法的RSD为6.9%,回收率为96%~105%。[结论]该方法较简单、易行、准确度高、稳定性好,值得推广应用。

Determination of Trace Arsenic in Astragalus membranaceus by Fiber-optic Resonance Rayleigh Scattering

[Objective] The aim was to determine the trace arsenic in Radix Astragali by optical fiber-sensing resonance rayleigh scattering method.[Method] A.membranaceus was pretreated by hydride generation-catalysis,combined with optical fiber sensing,experimental conditions were optimized and arsenic content was determined by resonance rayleigh scattering spectroscopy.[Result] The best experimental conditions were 0.3 mol/L sulfuric acid,0.9 moL/L NaBH4 and 0.2 mol/L NaBH4.RSD was 6.9％ and the recovery was between 96％-105％.[Conclusion] The method is simple,easy,accurate,stable and worthy of popularization and application.