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Study of Variable Selection Method Based on PLS for Quantitatively Measuring Heavy Metal in Water with LIBS
Hu Li1; Zhao Nan-jing2; Li Da-chuang1; Tang Lei1; Fang Li2
2017-08-01
发表期刊SPECTROSCOPY AND SPECTRAL ANALYSIS
卷号37期号:8页码:2585-2589
摘要The spectral characteristics of multiple variables were regularly extracted for concentration inversion in the quantitative analysis of heavy metal with LIBS. However, overlapped spectral information might be contained among variables and the complexity of the regression model also would be increased. To extract effective feature variables, the variable selection method based on PLS was studied. PLS model established with the concentration of the element under test used as the dependent variable and multiple LIBS spectrum characteristic variables used as independent variables. The optimal variable subset was extracted on the basis of the original variable importance projection index for variable selection. The results showed that the optimal variable subset for Pb was composed of the Pb I 405.78 nm peak, the spectral values before Pb I 405.78 nm peak, the intensity corrected by the internal standard element and the signal to background in lake water, and the correlation coefficient square of the training set was 0.912. The optimal variable subset was used for PLS regression analysis, and RSD and RE of the test set were 10.2% and 7.9%, respectively, significantly better than the predictive results of the internal standard. It also showed that variable screening results for different elements and different water samples was applicative to some extent, but the internal standard element failed in correction for different water samples. The results provided high quality characteristic data for the LIBS quantitative analysis, and the methods also provided a reference for other quantitative analysis involving variable selection.
文章类型Article
关键词Spectroscopy Laser Induced Breakdown Spectroscopy Variable Screening Pls Model
WOS标题词Science & Technology ; Technology
DOI10.3964/j.issn.1000-0593(2017)08-2585-05
收录类别SCI
语种英语
WOS研究方向Spectroscopy
WOS类目Spectroscopy
WOS记录号WOS:000408520400045
引用统计
文献类型期刊论文
条目标识符http://ir.hfcas.ac.cn:8080/handle/334002/33649
专题中科院安徽光学精密机械研究所
作者单位1.Hefei Normal Univ, Sch Elect & Informat Engn, Hefei 230061, Anhui, Peoples R China
2.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Hefei 230031, Anhui, Peoples R China
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Hu Li,Zhao Nan-jing,Li Da-chuang,et al. Study of Variable Selection Method Based on PLS for Quantitatively Measuring Heavy Metal in Water with LIBS[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2017,37(8):2585-2589.
APA Hu Li,Zhao Nan-jing,Li Da-chuang,Tang Lei,&Fang Li.(2017).Study of Variable Selection Method Based on PLS for Quantitatively Measuring Heavy Metal in Water with LIBS.SPECTROSCOPY AND SPECTRAL ANALYSIS,37(8),2585-2589.
MLA Hu Li,et al."Study of Variable Selection Method Based on PLS for Quantitatively Measuring Heavy Metal in Water with LIBS".SPECTROSCOPY AND SPECTRAL ANALYSIS 37.8(2017):2585-2589.
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