Fig. 1. Diagram of LIBS experimental setup

Fig. 2. Characteristic spectra of lead in paint coatings at 308-417 nm

Fig. 3. Calibration curve of 405.78 nm analytical line of Pb I

Fig. 4. Prediction results of multiple linear regression model for correction set

Fig. 5. Screening results of wavelength variables by CARS algorithm. (a) Trend of variable number of wavelength; (b) trend of RMSECV; (c) trend of regression coefficients of various wavelength variables

Fig. 6. Distribution of wavelength variables screened by CARS algorithm

Fig. 7. Prediction results of CARS-PLS model for correction set