石墨炉原子吸收法测定黑花生中的硒

该文以转基因食品黑花生为研究对象,针对硒易挥发的特点,建立了高压密闭消解-石墨炉原子吸收光谱法测定黑花生中总硒含量的测定方法.研究表明,HNO3-H2O2可使样品达到最佳消解,以Pd(NO3)2+Mg(NO3)2为基体改进剂,最佳灰化温度和原子化温度分别为500 ℃和2 000 ℃.在优化实验条件下,该方法测定硒的线性...

Determination of Selenium in Black Peanut by Graphite Furnace Atomic Absorption Spectrometry

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.