激光诱导击穿光谱应用于三种水果样品微量元素的分析

激光诱导击穿光谱(LIBS)在植物样品上面的应用是一个较新的课题. 为将LIBS技术能实际应用于与食品安全相关的领域，实验中对三种真空冻干水果样品进行了初步LIBS实验研究，鉴别了其LIBS光谱，并选取典型光谱线，运用统计学方法分析比较了三种水果中Ca，Na，K，Fe，Al，Mg六种元素含量的差别. 实验结果表明，苹果中Na的含量最高，Ca的含量最低，三种水果样品中的K，Fe，Mg等元素含量也都有差异. 实验结果还表明LIBS技术是一种检测、对比植物样品中微量元素含量的有效手段. 关键词： 激光诱导击穿光谱 等离子体 植物样品 微量元素

Application of laser-induced breakdown spectroscopy in analyzing microelements in three kinds of fruit samples

It is a relatively new task to apply the laser-induced breakdown spectrosopy(LIBS) to plant samples. To apply LIBS technique in the field related to foodstuff safety, we have done primary experiments using three kinds of fruit samples prepared by vacuum freeze-dried technique using the technique of discriminated LIBS spectra. The relative contents of six trace elements Ca, Na, K, Fe, Al and Mg in the samples were analyzed. By comparison we found that in apple samples the relative content of Na is the highest and the relative content of Ca is the lowest, and the contents of K, Fe, Mn, Mg are different for different fruit samples. Experiment results showed that LIBS technique is a valid means for measuring and comparing the content of trace elements in plant samples.