土壤中重金属元素的双脉冲激光诱导击穿光谱研究  

Analyses of heavy metals by soil using dual-pulsed laser induced breakdown spectroscopy

作　　者：杜闯[1] 高勋[1] 邵妍[1] 宋晓伟[1] 赵振明[1] 郝作强[1] 林景全[1] 

机构地区：[1]长春理工大学理学院,长春130022

出　　处：《物理学报》2013年第4期349-354,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11074027;60978014;61178022;1121112056;11274053);吉林省科技厅项目(批准号:20100168;20111812;201215132);教育部博士点基金-新教师(批准号:20112216120006)资助的课题~~

摘　　要：基于正交预烧蚀双脉冲激光诱导击穿光谱(DP-LIBS)技术对长春市四个地点地表土壤样品中的重金属元素进行了研究,根据光谱线强度定性分析了重金属元素Mn,Cr,Cu,Pb含量.实验结果发现,在532和1064nm激光脉冲能量分别为70和100mJ的条件下光谱增强随延时的变化出现双峰结构.脉冲间延时20μs时,MnI406.4nm光谱增强幅度达到2.75倍,延时为30μs时出现第二个尖峰,增强幅度为2.4倍.最后对正交预烧蚀DP-LIBS光谱增强机理进行了讨论.The heavy metal elements contained in soil samples which are collected from Changchun train station, CUST campus, South Lake and Jingyue Lake park are separately analyzed by using the orthogonal dual laser pulses induced breakdown spectroscopy （DP-LIBS）. The elements Mn, Cr, Cu and Pb are qualitatively analyzed according to the LIBS spectral intensity. It is shown that the intensity of the spectrum is greatly enhanced by using the DP-LIBS and the enhancement is closely related to the delay time between the double pulses. Enhancement variation with delay time presents double-peak changing when 532 nm and 1064 nm laser pulse energies are 70 mJ and 100 mJ respectively. The enhancement of Mn 1 406.4 nm is 2.75 at a delay time of 20 s and it is 2.4 at a delay time of 30 s when the second peak appears. The enhancement mechanism of orthogonal pre-ablation DP-LIBS is further discussed.

关 键 词：预烧蚀 双脉冲激光诱导击穿光谱 光谱增强 土壤污染 

分 类 号：TN24[电子电信—物理电子学] O433.1[机械工程—光学工程]