土壤中铜元素的激光诱导击穿光谱测量分析  

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

作　　者：鲁翠萍 刘文清[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：《光谱学与光谱分析》2010年第11期3132-3135,共4页Spectroscopy and Spectral Analysis

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

摘　　要：利用Nd:YAG脉冲激光器(1064nm)作为光源,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,测量并分析了土壤中铜元素激光诱导击穿光谱特性。以铜的327.396nm特征谱线作为分析线,在同一浓度下,固定探测器门宽,通过调节延迟时间,得到铜元素的衰变特性,确定了铜元素的最佳延迟时间为1.1μs。测定不同铜浓度下的特征谱线强度,表明在低浓度下,谱线强度随浓度的增加而增大。文章给出了铜元素的定标曲线,并计算得到铜元素的检测限为13.36μg·g-1。The present paper analyzed the characteristics of laser-induced breakdown spectroscopy（LIBS）of metal element Cu in soil using the Nd：YAG（wavelength：1 064nm）laser as the excitation source,where the spectral signals were detected by the highly resolved and wide spectral echelle spectrograph and intensified charge coupled device（ICCD）.The time evolution of the characteristic spectral line of Cu was obtained by changing the delay time of ICCD at the same concentration and the gate of ICCD with wavelength of 329.396nm of Cu as the characteristic spectral line,from which the best delay time 1.1μs was found.By measuring the intensities of the characteristic spectral line with different Cu concentrations,it was demonstrated that the intensities of the spectral line increased with the concentration of Cu under the condition of low concentration.From the results the LIBS calibration curve of Cu was obtained,and by fitting calculation the detection limit of Cu in soil at 13.36μg·g-1 was obtained.

关 键 词：土壤污染 重金属 激光诱导击穿光谱 激光等离子体 

分 类 号：O657.3[理学—分析化学]