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孙汉文, Zhanfeng Liu a, Hanwen Sun a, ∗, Shigang Shen a, Liqing Li a, b, Hongmei Shi a
Analytica Chimica Acta 550(2005)151-155,-0001,():
-1年11月30日
By HG-AFS, a new method was proposed for simultaneous determination of total arsenic and total selenium existed in the Chinese medicinal herbs in tartaric acid medium. The effects of analytical conditions and coexisting ions on the fluorescence signal intensity of analytes were investigated. The proposed method was provided with linear response ranges above 22µg l−1 for As and 44 µg l−1 for Se, and the detection limits of 0.13 and 0.12 µg l−1 were obtained for As and Se respectively. The recoveries of 93.8-96.1% for As and 95.3-99.1% for Se, and the precision of 1.2-3.8% and 2.4-5.3% (R.S.D., n=8) respectively, were obtained via simultaneous determined four samples of Chinese medicinal herbs and three certified botanic reference materials successfully. The proposed method has the advantages of simple operation, high sensitivity and high efficiency.
Simultaneous determination, Arsenic, Selenium, Chinese medicinal herbs, Atomic fluorescence spectrometry
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孙汉文, Han-Wen Suna, Ran Suoa, b, ∗
Analytica Chimica Acta 509(2004)71-76,-0001,():
-1年11月30日
Simultaneous vapor generation of zinc (Zn) and cadmium (Cd) was evaluated by atomic fluorescence spectrometry coupled with an intermittent flow vapor generation system. Some complexing reagents, surfactant and transition metal ions were respectively tested as enhancement reagents. Experiments showed that an appropriate amount of 8-hydroxyquinoline or phenanthroline and nickel ion simultaneously, effectively improved the vapor generation efficiency of Zn and Cd. The volatile species generation was presumed to be a hydrogenation process interpreting how the enhancement reagents played an important role in vapor generation. Additionally, due to the instability of volatile species, reaction temperature, rapid and sufficient mixing of reagents and rapid separation of the volatile species from liquid phase were also crucial. The method of simultaneous determination of Zn and Cd by intermittent flow vapor generation led to the development of atomic fluorescence spectrometry. The detection limits (3σb) were 1.6μg l−1 for Zn and 0.01μg l−1 for Cd and the relative standard deviations were 3.6% for Zn (50μg l−1, n=11) and 1.7% for Cd (2μg l−1, n=11) respectively. Results for the determination of Zn and Cd have been confirmed by the analysis of CRMs with good agreement between the certified and found values.
Enhancement reagent, Vapor generation, Atomic fluorescence spectrometry, Zinc and cadmium
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