氢化物发生-原子荧光法测定中药中痕量砷

应用AFS-2202a型双道原子荧光分光光度计，采用高压溶样的消解方式，在选定的仪器工作条件下，建立了氢化物发生-原子荧光测定中药中痕量砷的测定方法。同时，研究了硼氢化钾浓度，光电管负高压，灯电流，载气流量，屏蔽气流量等因素对测定结果的影响。在选定实验条件下，以工作曲线法测定了三种中药样品中痕量砷含量，国家标准物质桃叶(GBW08501)验证结果与推荐值一致。砷的工作曲线在0～80.0 μg·L-1范围内线性良好，线性回归方程为I_f=8.99×c-1.16, 相关系数为0.999 9，检出限为0.069 μg·L-1。

Determination of Trace Arsenic in Chinese Traditional Medicine by Hydride Generation Atomic Fluorescence Spectrometry

A hydride generation atomic fluorescence spectrometry method was developed for the determination of trace arsenic in CTM. A digestion system using HNO₃-H₂O₂ under high pressure was applied for the pretreatment of the samples. The experimental conditions were optimized. Under the optimum conditions, there was a good linear relationship between the fluorescence intensity and arsenic concentration in the range of 0-80 μg·L-1 with a correlation coefficient of 0.999 9, while the detection limit was 0.069 μg·L-1. Trace arsenic in the standard reference substance (GBW08501) was determined incording this way and the results for six times of analysis were in good agreement with certified value. The authors also studied the arsenic contents in three kinds of CTM by the working curve method and the results were satisfactory.