原子荧光光谱法测定水中痕量砷的优化研究

目的：建立一种原子荧光光度法测定水中痕量砷的方法。方法：应用AFS-2202E双通道原子荧光光度计测定痕量砷，对仪器的工作参数(包括负高压、载气流量和灯电流等)及样品的化学条件作了研究及优化。通过变量找到氢化物发生原子荧光法测定水中痕量砷的最佳工作条件。结果：硼氢化钾浓度为2%～2.4%之间、灯电流在55～60 mA、光电倍增管负高压在280 V、载气流量在400 mL/min时,是该法测砷的最佳反应条件。结论：该方法操作简单、准确度高、灵敏度高，在实际测定工作中具有重要意义。

Optimal study on determination of trace arsenic in water by atomic fluorescence spectrometry

Objective To establish a method for determination of trace arsenic in water by atomic fluorescence spectrophotometry Methods For the determination of trace arsenic by AFS-2202E dual-channel atomic fluorescence spectrometer, the working parameters of the instrument(including negative high pressure, gas flow and light current) and the chemical conditions of the sample were studied and optimized. The best working conditions for determination of trace arsenic in water were found by using the variables. Results The results showed that the optimum reaction conditions were as follows: The concentration of potassium borohydride was 2%~2.4%, the lamp current was 55~60 mA, the negative high voltage of photomultiplier tube was 280 V, and the carrier gas flow rate was 400 mL/min. Conclusion This method is simple, accurate and sensitive, and is of great significance in practical measurement work.