激光诱导击穿光谱法定量分析水泥中的铜元素

为定量分析水泥中的铜(Cu)元素,根据激光诱导击穿光谱分析方法(Ll BS)的特点,建立了激光诱导击穿光谱分析系统。采用标准加入法为定标方法,制备了5个不同含铜量的水泥样品。根据LIBS谱图,以213.598 nm和219.958 nm作为分析线。应用Savitzky-Golary卷积平滑方法对光谱数据进行了预处理,比较了Guass、Lorentz和Voigt拟合方法对光谱曲线的拟合效果。对测量结果采用一元线性拟合建立了相应的定标曲线,213.598 nm和219.958 nm定标曲线的校正决定系数分别为0.994 8和0.986 4,平均相对误差分别为3.20%和5.78%。实验结果表明:213.598 nm作为分析线的准确度优于219.958 nm分析线,该方法能够满足水泥中Cu元素定量分析的要求。

Quantitative Analysis of Cu in Cement by Laser Induced Breakdown Spectroscopy

In order to detect copper in the cement quantitatively, on the basis of the characteristics of laser induced breakdown spectroscopy method, the laser induced breakdown spectroscopy system was set up. The standard addition method for the calibration method was adopted and five samples of cement containing different content of copper were made. According to the LIBS spectra, 213. 598 nm and 219. 958 nm were chosen as analysis lines. The spectrum data were preprocessed by Savitz-ky-Golary convolution smoothing method, and the fitting curves by Guass, Lorentz and Voigt fitting were compared. The calibration curves were set up by single variable linear fitting method. The Ad-just R-Square of calibration curves of 213 . 598 nm and 219 . 958 nm are 0 . 9948 and 0 . 9864 re-spectively and the average relative errors are 3 . 20% and 5 . 78%. The results show that the accura-cy of 213. 598 nm as the analysis line is better than 213. 598 nm for copper detection. This tech-nique is reasonable to quantitatively analysis the metal elements in the cement by LIBS.