Wu Yiqing, Sun Tong, Liu Jin, Gan Lanping, Liu Muhua. Detection of Chromium Content in Edible Vegetable Oil with DP-LIBS Combined with LSSVM and CARS Methods[J]. Laser & Optoelectronics Progress, 2018, 55(1): 13005
- Laser & Optoelectronics Progress
- Vol. 55, Issue 1, 13005 (2018)
Fig. 1. LIBS spectra of samples of 5, 21 and 37
Fig. 2. Predicted results of calibration samples with univariate calibration model of Cr I 425.39 nm
Fig. 3. Results of CARS variable selection of Cr in vegetable oil. (a) Variation of wavelength variable number; (b) variation of RMSECV; (c) trend of variable regression coefficient
Fig. 4. Distribution of wavelength variables selected by CARS method
Fig. 5. Predicted results of samples in calibration set with CARS-LSSVM calibration model
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Table 1. Content of chromium in soybean oil samples
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Table 2. Content of chromium in corn oil samples
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Table 3. Content of chromium in peanut oil samples
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Table 4. Fitting results of characteristic spectral line of chromium
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Table 5. Predicted results of prediction samples with univariate calibration model of Cr I 425.39 nm
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Table 6. Predicted results of samples in prediction set with LSSVM calibration model
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