Rapid quantitative detection of mineral oil contamination in vegetable oil by near-infrared spectroscopy

Mantong Zhao; Dawei Zhang; Lulu Zheng; Otto Condliffe; Yi Kang

doi:10.3788/COL202018.043001

Chinese Optics Letters, Volume. 18, Issue 4, 043001(2020)

Rapid quantitative detection of mineral oil contamination in vegetable oil by near-infrared spectroscopy

Mantong Zhao¹, Dawei Zhang^1,2、*, Lulu Zheng¹, Otto Condliffe³, and Yi Kang¹

¹Engineering Research Centre of Optical Instrument and System, Ministry of Education, Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China

²Shanghai Institute of Intelligent Science and Technology, Tongji University, Shanghai 200092, China

³Sino-England International College, University of Shanghai for Science and Technology, Shanghai 200093, China

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Figures & Tables(8)

Fig. 1. Transmittance spectra of rapeseed oil (B1 brand) and mineral oil.

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Fig. 2. $PC 2 \times PC 1$ score plot for the overall set of 120 rapeseed–mineral oil samples.

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Fig. 3. Calibration results of (a) DOSC-SPA-PCR and (b) DOSC-SPA-PLS. Fifteen samples per concentration were used for modeling, and there were 120 samples in total.

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Fig. 4. Prediction results of (a) DOSC-SPA-PCR and (b) DOSC-SPA-PLS. Ten samples per concentration were used for prediction, and there were 80 samples in total.

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Fig. 5. Prediction results of (a) DOSC-SPA-PCR and (b) DOSC-SPA-PLS for B2 rapeseed oil.

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Table 1. Sample Information in Calibration and Prediction Sets
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Table 1. Sample Information in Calibration and Prediction Sets
Set Brand Concentration ( $g \cdot {kg}^{- 1}$ )
Calibration B1 1 0.5 0.2 0.1 0.08 0.05 0.03 0.01
Prediction B1 1 0.5 0.2 0.1 0.08 0.05 0.03 0.01
B2 0.8 0.1

Table 2. Effective Wavelengths Selected by SPA

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Table 2. Effective Wavelengths Selected by SPA

No.	Wavelength (nm)	No.	Wavelength (nm)
1	910	19	1906
2	930	20	1922
3	1066	21	1930
4	1614	22	1970
5	1674	23	2026
6	1690	24	2030
7	1706	25	2050
8	1710	26	2066
9	1734	27	2078
10	1746	28	2090
11	1750	29	2098
12	1754	30	2106
13	1782	31	2110
14	1790	32	2114
15	1814	33	2122
16	1850	34	2126
17	1866	35	2134
18	1898	36	2150

Table 3. Results of Different Calibration Models

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Table 3. Results of Different Calibration Models

Spectral Set	Model	Variable Number	R	RMSE
X	PCR	311	0.991	0.009
X	PLS	311	0.983	0.009
$X^{DOSC}$	PCR	311	0.995	0.009
$X^{DOSC}$	PLS	311	0.985	0.008
X (SPA)	SPA-PCR	36	0.996	0.006
X (SPA)	SPA-PLS	36	0.988	0.007
$X^{DOSC}$ (SPA)	DOSC-SPA-PCR	36	0.998	0.005
$X^{DOSC}$ (SPA)	DOSC-SPA-PLS	36	0.989	0.006

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Mantong Zhao, Dawei Zhang, Lulu Zheng, Otto Condliffe, Yi Kang, "Rapid quantitative detection of mineral oil contamination in vegetable oil by near-infrared spectroscopy," Chin. Opt. Lett. 18, 043001 (2020)

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