蒸气发生-原子荧光光谱法测定中草药中不同形态的汞

建立了蒸气发生-原子荧光光谱法测定中草药复方方剂原生药、残渣、悬浮态、可溶态的无机汞和有机汞的方法。研究了仪器的工作条件、试剂浓度、增感剂对汞原子荧光强度的影响及有机汞的氧化条件，探讨了共存离子对汞测定的干扰和消除方法，利用本方法成功地对万氏牛黄清心方剂中的汞进行了形态分析。方法检出限为7.6 ng·L-1，RSD为1.56%～3.28%，回收率为90.3%～110.3%。

Speciation Analysis of Mercury in Traditional Chinese Medicine by Vapor-Generation Atomic Fluorescence Spectrometry

A sensitive method has been proposed for the determination of inorganic mercury and total organic mercury in traditional Chinese medicine (Wanshi Niuhuang Qingxin) by vapor-generation atomic fluorescence spectrometry. The experimental conditions that influence the atomic fluorescence signal intensity of Hg and the oxidization of organic mercury were investigated and optimized. Thiourea citric acid was selected as a sensitization agent, which greatly enhanced atomic fluorescence signal intensity of mercury. The influence of foreign ions and their elimination were studied. The detection limit of the method for Hg was 7.6 ng x L(-1) and the relative standard deviation was 1.56%-3.28% for Hg. The proposed method was successfully applied to the determination of mercury speciation in real samples with a recovery range of 90.3%-110.3%.