Chinese Physics B, Volume. 29, Issue 9, (2020)
Determination of potassium sorbate and sorbic acid in agricultural products using THz time-domain spectroscopy
Figures & Tables(11)
Fig. 2. Absorption coefficients and refractive indices of the (a) PS and (b) SA.
Fig. 3. THz absorption spectrum of PS and wheat/polyethylene mixture.
Fig. 4. THz absorption spectrum in SA and wheat/polyethylene mixtures.
Fig. 5. iPLS results for 12 subintervals in the absorption spectrum from PS.
Fig. 6. PSO fitness function for (a) PS and wheat mixtures, and (b) SA and wheat mixtures.
Fig. 7. Scatter plots of the predicted vs. actual value in (a) PS and wheat/PE mixture, and (b) SA and wheat/PE mixture with the PSO-SVC model.
Table 1. Component of mixture.
View tableView in ArticleTable 1. Component of mixture.
No. PS/SA/mg PE/wheat/mg Concentration/% 1 0 200 0 2 5 195 2.5 3 10 190 5 4 20 180 10 5 30 170 15 6 40 160 20 7 60 140 30 8 80 120 40 9 100 100 50 10 200 0 100
Table 2. iPLS wave screening results for 12 subintervals of the absorption spectrum from PS.
View tableView in ArticleTable 2. iPLS wave screening results for 12 subintervals of the absorption spectrum from PS.
No. Frequency range/THz RMSECV R Full spectrum 0.2–1.6 1.0198 0.932 The 1st subinterval 0.2–0.317 1.2135 0.898 The 2nd subinterval 0.317–0.434 1.0832 0.942 The 3rd subinterval 0.434–0.551 1.0863 0.991 The 4th subinterval 0.551–0.668 0.6882 0.989 The 5th subinterval 0.668–0.785 0.3754 0.996 The 6th subinterval 0.785–0.902 0.2319 0.998 The 7th subinterval 0.902–1.019 0.4073 0.997 The 8th subinterval 1.019–1.136 0.4621 0.996 The 9th subinterval 1.136–1.253 0.9003 0.935 The 10th subinterval 1.253–1.37 0.7712 0.990 The 11th subinterval 1.37–1.487 1.0214 0.936 The 12th subinterval 1.487–1.6 1.2465 0.896
Table 3. iPLS wave screening results for different subintervals of the PS spectra.
View tableView in ArticleTable 3. iPLS wave screening results for different subintervals of the PS spectra.
No. of subintervals Feature frequency ranges/THz Average RMSECV Average R 10 0.48–1.46 0.8653 0.9513 11 0.454–1.47 0.8464 0.9598 12 0.551–1.487 0.7521 0.9637 13 0.546–1.496 0.7907 0.9621 14 0.5–1.5 0.8763 0.9465 15 0.479–1.502 0.8583 0.95587 16 0.552–1.52 0.8906 0.9476
Table 4. Prediction results with different PSO-SVC models.
View tableView in ArticleTable 4. Prediction results with different PSO-SVC models.
Sample Frequency range/THz c g Prediction Correction set/% Prediction set/% PS + wheat 0.2–1.6 2.163 1.032 96.653 93.672 0.551–1.487 1.284 0.863 97.765 95.356 PS + PE 0.2–1.6 2.026 0.965 97.356 95.685 0.551–1.487 1.206 0.843 98.65 96.657 SA + wheat 0.2–1.6 1.982 1.103 97.473 95.890 0.454–1.216 1.374 0.906 98.32 97.242 SA + PE 0.2–1.6 1.865 1.214 98.656 97.356 0.454–1.216 1.179 0.867 99.01 98.013
Tools
Get Citation
Copy Citation Text
Yuying Jiang, Guangming Li, Ming Lv, Hongyi Ge, Yuan Zhang. Determination of potassium sorbate and sorbic acid in agricultural products using THz time-domain spectroscopy[J]. Chinese Physics B, 2020, 29(9):
Paper Information
Received: Mar. 31, 2020
Accepted: --
Published Online: Apr. 29, 2021
The Author Email: Ge Hongyi (zy-haut@163.com)
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20