2012•Advanced materials researchOpen access

Study on Determination of Trace Mercury in Chinese Herbal Medicines by Hydride Generation-Atomic Fluorescence Spectrometry

Qing Shan Pan, Wei Liu, Ping Yi, Du Shu Huang, Na Wu, Ze Feng Wang

Abstract

A hydride atomic fluorescence spectrometry method was developed for the determination of trace mercury in Chinese herbal medicines. A digestion system using HNO3-H2O2 under high pressure was applied for the pretreatment of the samples. The operating condition of the instrument were optimized. The effect of the acid in sample solution and carrier liquid, and the effect of reducing agent KBH4 in solution to the determination of mercury were studied. Under the optimum conditions. Five kinds of Chinese herbal medicines in Yun Nan province of China was measured. There was a good linear coefficient between the fluorescent intensity and mercury concentration in the range of 0～10μg•L-1with a correlation coefficient of 0.9998,while the determination limits was 3.7ng•L-1,the relative standard deviation was 2.4%. The content of total mercury in the samples was 5.25～16.32ng•g-1 and a recovery range of 83.6%～109.2% were obtained.

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Key concepts: Mercury (programming language), Hydride, Relative standard deviation, Correlation coefficient, Chemistry, Linear range, Detection limit, Analytical Chemistry (journal)