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目的利用激光诱导击穿光谱技术对橘子中铅含量进行快速定量检测。方法将普通的橘子样品进行铅溶液污染处理,利用原子吸收法测定样品中铅元素含量作为参考浓度,通过分析橘子中铅元素的激光诱导击穿光谱特征谱线,结合NIST标准数据库,得出铅元素的激光诱导击穿光谱显著的波长为363.958 nm、368.348 nm、405.783 nm,并确定以405.783 nm作为定量分析铅元素特征波长的方法。结果分析实验中的不同浓度样品的光谱信息,拟合得到铅元素的LIBS特征谱线强度和铅元素浓度的定量分析曲线,其中拟合曲线的相关系数为0.98195,分析定标模型得出该模型不适用于浓度小于10μg/g样品,根据检出限公式得到检测限(D.L)的值为12.98μg/g。结论研究结果表明该激光技术在农产品重金属检测以各种样品中的元素含量检测方面具有很大的前景。
OBJECTIVE: To rapidly and quantitatively detect lead in orange by laser induced breakdown spectroscopy. Methods The common orange samples were treated with Pb solution. The content of Pb in the samples was determined by atomic absorption spectrometry as the reference concentration. By analyzing the laser-induced breakdown spectra of lead in oranges and combining with NIST standard database, lead The dominant wavelength of laser induced breakdown spectroscopy was 363.958 nm, 368.348 nm and 405.783 nm, and the method of quantitative analysis of characteristic wavelength of lead by 405.783 nm was established. Results The spectral information of different concentration samples in the experiment was analyzed and the quantitative analysis curve of LIBS characteristic lead concentration and lead concentration of lead was fitted. The correlation coefficient of the fitted curve was 0.98195. The model was obtained by analyzing the calibration model Does not apply to the concentration of less than 10μg / g sample, according to the limit of detection formula (DL) value of 12.98μg / g. Conclusions The results show that the laser technology has great potential in the detection of heavy metals in agricultural products in order to detect the content of various elements in various samples.