Quantification of major elements in limestones using laser-induced breakdown spectroscopy combined with multivariate regression approaches
CHEN Junxi1, CHEN Sha2, YANG Yanting3, WANG Xu*2 DUAN Yixiang*2
1. School of Chemical Engineering,Sichuan University,Chengdu 610065,China; 2. School of Mechanical Engineering,Sichuan University,Chengdu 610065,China; 3. Chengdu Aliben Science & Technology Co.,LTD.,Chengdu 610000,China
Abstract:Limestones had been widely used in metallurgy,manufacturing,chemistry,architecture,etc.in recent years due to its excellent mineralogical properties.The carbonate and non-carbonate components,such as CaO,SiO2,Fe2O3 and MgO,played important roles in the industrial application of limestones.Therefore,in order to achieve accurate quantification of the components above in limestones and maximize their commercial value,the quantitative analysis of four major elements including Ca,Si,Fe and Mg was investigated based on a portable laser-induced breakdown spectrometer (LIBS) combined with univariate model,partial least square regression and principal component regression.The results of cross validation were used as the criteria for parameter optimization of multivariate regression models.The predictive determination coefficient,the root mean square error of prediction and the relative standard deviation of test set were applied to evaluate the quantitative accuracy and stability of these three regression models.The results showed that the multivariate regression methods improved the quantitative performance of traditional univariate analysis significantly.Among them,the principal component regression performed best.The four elements achieved the predictive determination coefficient of 0.999 8,0.999 6,0.999 6 and 0.999 0,and the root mean square errors of prediction of 0.066 6%,0.089 3%,0.014 8% and 0.038 9%,respectively,and the relative standard deviations of 1.00%,5.04%,5.03% and 13.18%,respectively.It was indicated that the multivariate regression model could not only correct the quantitative accuracy deviation of traditional univariate analysis caused by matrix effects and spectral line interference,but also adjust the detection instability caused by environment,hardware system and samples.Furthermore,principal component regression could be a reliable method for the portable LIBS quantitative analysis of major elements in limestone samples.
陈君玺, 陈莎, 杨燕婷, 王旭, 段忆翔. 激光诱导击穿光谱结合多变量回归法对石灰岩中主量元素的定量分析[J]. 冶金分析, 2021, 41(1): 13-23.
CHEN Junxi, CHEN Sha, YANG Yanting, WANG Xu DUAN Yixiang. Quantification of major elements in limestones using laser-induced breakdown spectroscopy combined with multivariate regression approaches. , 2021, 41(1): 13-23.
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