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《Journal of Instrumental Analysis》 2011-02
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Determination of Selenium in Black Peanut by Graphite Furnace Atomic Absorption Spectrometry

GONG Qiao-juan,YANG Hai-ying(Department of Application Chemistry,Yuncheng University,Yuncheng 044000,China)  
The trace levels of selenium content in black peanuts were determined by graphite furnace atomic absorption spectrometry(GF-AAS).The sample was ingested with high-pressure closed vessel using nitric acid-hydrogen peroxide as solvent.Pd(NO3)2+Mg(NO3)2 were selected as chemical modifiers to increase the thermostability of selenium,and the pyrolysis temperature and the atomization temperature for the experiments were seted at 500 ℃ and 2 000 ℃,respectively.Under the optimal conditions,the calibration curve showed a good linear relationship between the adsorption peak area and selenium concentration in the range of 10-200 μg·L-1 with a detection limit(3σ) of 8.78 μg·L-1.The relative standard deviation(n=11) of blank sample was 4.6%,and the recoveries varied from 96% to 113%.The result also indicated that the kernels and coats of black peanuts contained trace selenium and their contents were higher than those of other two local peanuts.
【Fund】: 山西省高校科技开发项目(200713033);; 运城学院院级科研基金资助项目(20060257)
【CateGory Index】: O657.31;TS255.7
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