土壤中铅元素的激光诱导击穿光谱测量分析  

Measurement and Analysis of Lead in Soil Using Laser-Induced Breakdown Spectroscopy

作　　者：鲁翠萍 刘文清(指导)[1] 赵南京 刘立拓 陈东[1] 张玉钧[1] 刘建国[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所中国科学院环境光学与技术重点实验室,安徽省环境光学监测技术重点实验室,安徽合肥230031

出　　处：《激光与光电子学进展》2011年第5期121-124,共4页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(60908018);中国科学院知识创新工程重大项目(kzcx1-yw-06-01);安徽省科技计划项目(083H3b1581);所长基金(073H371141)资助课题

摘　　要：利用Nd∶YAG脉冲激光器（波长：1064 nm）作光源,以高分辨率、宽光谱段的中阶梯光栅光谱仪和ICCD为谱线分离与探测器件,测量并分析土壤中铅元素的激光诱导击穿光谱（LIBS）特性。以铅的（Pb：405.78 nm）特征谱线作为分析线,测定不同铅浓度下的特征谱线强度。结果表明铅的质量分数在40×10-6~1350×10-6范围内,谱线强度随浓度的增加而增加。给出铅元素的定标曲线,并计算得到铅元素的检测限约为25.82×10-6质量分数。LIBS测量值与X射线荧光光谱（XRF）测量值的相对误差最大值为8%。The characteristics of laser-induced breakdown spectroscopy （LIBS） of metal element Pb in soil are analyzed using the Nd：YAG （wavelength： 1064 nm） laser as the excitation source, where the spectral signals are detected by the high resolved and wide spectral echelle spectrograph and intensity charged coupled device （ICCD）, with the characteristic spectral lines of Pb （Pb, 405.78 nm） for the analysis of line. By measuring the intensities of the characteristic spectral line with different Pb concentrations, it is demonstrated that the intensities of the spectral line increase with the mass fraction of Pb between 40 × 10 -6 and 1350 × 10 -6 . From the results, the LIBS calibration curve of Pb is obtained, and by fitting calculation, the detection limit of Pb in soil at 25.82 × 10-6 is obtained. The maximum relative error of LIBS measurements and X-ray fluorescence （XRF） measurements is 8 %.

关 键 词：光谱学 激光诱导击穿光谱 土壤污染 重金属 定量分析 

分 类 号：O433.4[机械工程—光学工程]