XIANG Yu,LI Mao-gang,YAN Chun-hua,ZHANG Tian-long,LI Hua.Rapid Quantitative Analysis of PAHs in Oily Sludge by Near-infrared Spectroscopy Combined with LightGBM[J].Journal of Instrumental Analysis,2025,44(08):1602-1611.
XIANG Yu,LI Mao-gang,YAN Chun-hua,ZHANG Tian-long,LI Hua.Rapid Quantitative Analysis of PAHs in Oily Sludge by Near-infrared Spectroscopy Combined with LightGBM[J].Journal of Instrumental Analysis,2025,44(08):1602-1611. DOI: 10.12452/j.fxcsxb.25011842.
Rapid Quantitative Analysis of PAHs in Oily Sludge by Near-infrared Spectroscopy Combined with LightGBM
In this study,a novel approach combining near-infrared(NIR) technology and the light gradient boosting machine(LightGBM) algorithm was developed for the quantitative prediction of phenanthrene and fluoranthene concentrations in oily sludge. Firstly,systematic optimization of model parameters was conducted to enhance predictive performance. Subsequently,spectral preprocessing techniques were applied to the NIR spectral data of the samples. Furthermore,the variable selection methods of competiti
ve adaptive reweighted sampling(CARS),mutual information(MI),and whale optimization algorithm(WOA) were used to select the spectral features effectively. Finally,based on the optimally selected input variables,the LightGBM prediction models were established. The performance of the LightGBM model was evaluated through comparative analysis with partial least squares regression(PLS),random forest(RF),and support vector machine(SVM). The results demonstrated that for phe content prediction,the Nor-SG-WOA-LightGBM model achieved superior performance,with a coefficient of determination(
R
²
p
) of 0.995 2 and root mean square error(RMSE
p
) of 0.242 6 mg/g. For flt content prediction,the SNV-SG-CARS-LightGBM model showed optimal performance,achieving an
R
²
p
of 0.995 1 and RMSE
p
of 0.245 2 mg/g. This method provides a technical reference for the analysis of polycyclic aromatic hydrocarbons(PAHs) in oily sludge.
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