Detection of Chromium Content in Edible Vegetable Oil with DP-LIBS Combined with LSSVM and CARS Methods

Wu Yiqing; Sun Tong; Liu Jin; Gan Lanping; Liu Muhua

doi:10.3788/LOP55.013005

Laser & Optoelectronics Progress, Volume. 55, Issue 1, 13005(2018)

Detection of Chromium Content in Edible Vegetable Oil with DP-LIBS Combined with LSSVM and CARS Methods

Wu Yiqing^1,2,3, Sun Tong^1、*, Liu Jin^1,2,3, Gan Lanping^1,2,3, and Liu Muhua^1,2,3

Author Affiliations

¹School of Engineering, Jiangxi Agricultural University, Nanchang, Jiangxi 330045, China

²Key Laboratory of Optics Electronics Technology and Application of Biomaterials of Jiangxi Province Higher Education, Nanchang, Jiangxi 330045, China

³Collaborative Innovation Center of Postharvest Key Technology and Quality Safety of Fruits and Vegetables in Jiangxi Province, Nanchang, Jiangxi 330045, China

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Figures & Tables(11)

Fig. 1. LIBS spectra of samples of 5, 21 and 37

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Fig. 2. Predicted results of calibration samples with univariate calibration model of Cr I 425.39 nm

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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

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Fig. 4. Distribution of wavelength variables selected by CARS method

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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 1. Content of chromium in soybean oil samples
Sample number Mass fraction of Cr in soybean oil /10^-6
1 11.98
2 12.85
3 18.95 (ps1)
4 20.98
5 42.95
6 42.95
7 62.87 (ps5)
8 63.92
9 80.07
10 81.86 (ps7)
11 99.45
12 104.89
13 117.68 (ps10)
14 121.95
15 136.96
16 139.83

Table 2. Content of chromium in corn oil samples
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Table 2. Content of chromium in corn oil samples
Sample number Mass fraction of Crin corn oil /10^-6
17 15.40
18 15.95
19 19.96
20 20.97
21 36.92
22 40.02
23 56.59 (ps4)
24 58.59
25 79.28
26 79.99 (ps6)
27 91.95 (ps8)
28 95.60
29 114.36
30 120.71
31 134.98 (ps11)
32 136.59

Table 3. Content of chromium in peanut oil samples
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Table 3. Content of chromium in peanut oil samples
Sample number Mass fraction of Crin peanut oil /10^-6
33 12.72
34 15.80
35 18.53
36 21.99 (ps2)
37 40.76 (ps3)
38 42.31
39 57.00
40 57.91
41 77.88
42 81.71
43 94.90
44 103.85 (ps9)
45 117.49
46 118.92
47 136.70
48 139.76 (ps12)

Table 4. Fitting results of characteristic spectral line of chromium
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Table 4. Fitting results of characteristic spectral line of chromium
Characteristicline Fittingequation Correlationcoefficient
Cr I 425.39 nm y=13.82x+167.69 0.9722
Cr I 427.43 nm y=10.43x-38.42 0.9638
Cr I 428.87 nm y=7.24x-59.36 0.9440

Table 5. Predicted results of prediction samples with univariate calibration model of Cr I 425.39 nm

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Table 5. Predicted results of prediction samples with univariate calibration model of Cr I 425.39 nm

Samplenumber	Actual massfraction /10^-6	Predicted massfraction /10^-6	Relativeerror /%
ps1	18.95	26.50	39.86
ps2	21.99	37.43	70.17
ps3	40.76	50.88	24.82
ps4	56.59	55.59	1.77
ps5	62.87	55.40	11.87
ps6	79.99	73.25	8.43
ps7	81.86	68.91	15.82
ps8	91.95	85.55	6.96
ps9	103.85	105.09	1.19
ps10	117.68	116.66	0.86
ps11	134.98	154.29	14.31
ps12	139.76	141.99	1.60

Table 6. Predicted results of samples in prediction set with LSSVM calibration model

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Table 6. Predicted results of samples in prediction set with LSSVM calibration model

Samplenumber	Actual massfraction /10^-6	CARS-LSSVM		Five-variable LSSVM		Full LSSVM
Samplenumber	Actual massfraction /10^-6	Predicted massfraction /10^-6	Relativeerror /%	Predicted massfraction /10^-6	Relativeerror /%	Predicted massfraction /10^-6	Relativeerror /%
ps1	18.95	22.46	18.52	27.85	45.53	42.89	126.32
ps2	21.99	28.25	28.45	31.06	41.24	40.50	84.13
ps3	40.76	46.18	13.30	52.04	27.65	39.77	2.44
ps4	56.59	51.22	9.49	51.69	8.66	42.64	24.66
ps5	62.87	61.75	1.77	61.46	2.24	60.69	3.47
ps6	79.99	79.59	0.50	77.89	2.62	75.11	6.10
ps7	81.86	80.66	1.47	84.66	3.42	78.88	3.64
ps8	91.95	98.97	7.63	99.70	8.43	129.99	41.37
ps9	103.85	109.29	5.24	111.67	7.53	109.11	5.07
ps10	117.68	126.61	7.59	127.11	8.01	125.79	6.89
ps11	134.98	134.29	0.51	134.17	0.60	131.79	2.36
ps12	139.76	128.37	8.15	134.77	3.57	74.07	47.00

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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

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