用激光诱导击穿光谱技术定量分析矿石样品中Si和Mg  

Quantitative Analysis of Si and Mg in Ore Samples Using Laser-Induced Breakdown Spectroscopy

作　　者：陆运章[1] 汪家升[1] 李威霖[1] 郑剑杰[1] 

机构地区：[1]北京交通大学理学院,北京100044

出　　处：《中国激光》2009年第8期2109-2114,共6页Chinese Journal of Lasers

摘　　要：激光诱导击穿光谱(LIBS)技术被用来定量分析矿石样品元素成分。波长为1064 nm的Nd∶YAG脉冲激光聚焦在样品表面后产生激光等离子体,等离子体原子发射谱由微型光谱仪记录。为了优化实验条件,研究了激光能量和延时时间等部分参数对谱线强度的影响。实验发现激光脉冲能量对光谱信号的影响大。在选定的变化范围内,改变延时对光谱的影响较小。实验中分别以硅(Si I谱线251.6 nm)和镁(Mg I谱线285.2 nm)为分析线,采用外定标法对硅和镁的含量进行了反演,测得的硅和镁元素含量值与标准值的相对误差分别为7%和3%。Laser-induced breakdown spectroscopy （LIBS） was used to yield quantitative elemental information of ore samples. A Nd ： YAG laser beam with wavelength of 1064 nm was focused on the sample surface to generate laser plasma. The plasma atomic emission spectra were recorded by a micro-spectrometer. In order to optimize experimental condition, dependence of the spectral line intensity upon laser pulse energy and time delay of signal collection with respect to the initiating laser pulse were investigated. Strong influence of the laser pulse energy on the spectral signal was found in the experiments. However, time-delay had less effect on the spectra within the range of the selected time delays. Spectral lines of silicon （Si I line at 251.6 nm） and magnesium （Mg I line at 285.2 nm） were separately used to determine, the silicon and magnesium contents in the samples based on the external standard method. The relative standard deviations （RSDs） of the measured elemental contents relative to those standard values were 7 % .and 3 % respectively for the silicon and magnesium elements. It provides a basis for the feasibility of rapid detection and elementary analysis with the laser-induced breakdown spectroscopic technique.

关 键 词：光谱学 激光诱导击穿光谱 矿石 外标法 定量分析 

分 类 号：TN249[电子电信—物理电子学] O657.38[理学—分析化学]