[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%.
Yang
Li-li
LL
College of Chemistry, Hebei Normal University, Shijiazhuang 050016, China.
Li
Na
N
Zhang
De-qiang
DQ
Gao
Li-rong
LR
Kang
Hai-yan
HY
D019343:Citric Acid / Q000737:chemistry; D004365:Drugs, Chinese Herbal / Q000032:analysis* / Q000737:chemistry / Q000592:standards; D005453:Fluorescence; D008516:Medicine, Chinese Traditional; D008628:Mercury / Q000032:analysis* / Q000737:chemistry; D017669:Mercury Compounds / Q000032:analysis / Q000737:chemistry; D009941:Organomercury Compounds / Q000032:analysis / Q000737:chemistry; D010084:Oxidation-Reduction; D015203:Reproducibility of Results; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013890:Thiourea / Q000737:chemistry; D014835:Volatilization
D004365:Drugs, Chinese Herbal; D017669:Mercury Compounds; D009941:Organomercury Compounds; D019343:Citric Acid; D008628:Mercury; D013890:Thiourea