减压氩气环境下激光微区发射光谱分析精度的研究

依据数理统计理论，对减压氩气环境下，利用CCD数据采集处理系统所获取的激光微区发射光谱数据进行筛选，用以减弱样品表面激光蚀坑变化、样品不均匀性、激光波动性等因素的影响，探讨了激光微区发射光谱定量分析精度的改善方法。实验中以铝合金标样为分析样品，对Cu，Zn，Mg分析表明：分析谱线相对强度RSD分别为1.80%，4.35%，6.29%，定量分析相对标准偏差RSD分别为10.1%，6.98%，8.17%，分析结果平均值的相对误差为-3.76%，3.62%，-1.62%。

Study on Analytic Precision of Laser Microemission Spectral Analysis in Argon Atmosphere at Reduced Pressure

According to mathematic statistics, data for laser microemission spectroscopic analysis were selected, which were collected with the use of CCD (charge-coupled device) in arg on atmosphere a t reduced pressure. By selection, the effects of some factors,such as the difference of bore ablated on the sample surface by the laser, the distribution nonuniformity of element in the sample, and the fluctuation of output energy of the laser, etc. were reduced. The method that improves analytic precision of laser microemission spectroscopic analysis was studied. And quantitative analysis of Cu, Zn and Mg in aluminum alloy standard samples was performed, using the Cu (I) line at 324.7 nm, the Zn (I) line at 334.5 nm, and the Mg (I) line at 383.8 nm. The results show that the RSDs of relative intensity of the spectral lines of Cu, Zn, Mg are 1.80%, 4.35% and 6.29% respectively, and the RSDs of quantitative analysis of them are 10.1%, 6.98% and 8.17% respectively. The relative errors of the average of analysis of them are -3.76%, 3.62% and -1.62% respectively.