氢化物发生-原子荧光光谱测定反应香精中的砷和汞

Determination of Arsenic and Mercury by Hydride Generation-Atomic Fluorescence Spectrmetry in Process Flavoring

建立了用氢化物发生－原子荧光光谱法连续测定反应香精中的汞和砷。考察了样品前处理方法和仪器参数对实验结果的影响。实验确定反应香精样品的微波消解试剂为硝酸：过氧化氢＝6：2（V／V）、最高消解温度为210℃、消解时间为25min为最佳前处理条件；原子荧光的还原剂为20g／L硼氢化钾，载流液为5％盐酸。方法测定汞的回收率为99．2％～110．0％，砷的回收率为96．5％～113．1％。在最优化的条件下对9种反应香精样品进行测定，其中砷和汞的含量均未超过国家标准。

A method for the determination of the arsenic and mercury in process flavoring by hydride generation-atomic fluorescence spectrometry has been proposed, and the pre-treatment and detection conditions were investigated and optimized. Under the optimum conditions, the recoveries of As and Hg are ranged from 96. 1%-113. 1% and 99. 2%-110. 0%, respectively. Nine process flavoring were analyzed, and the results show that the concentrations of As and Hg are all under the maximum allowable contents of National Standard（GB）.