Quantitative Analysis of Cu and Ni in Oil-Contaminated Soil by LIBS Combined With Variable Selection Method and PLS

Table 1. The Contents list of Cu and Ni (%)
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Table 1. The Contents list of Cu and Ni (%)
编号 Cu Ni 编号 Cu Ni
1 0.45 0.65 9 0.57 0.77
2 0.51 0.71 10 0.78 0.98
3 0.48 0.68 11 0.81 1.01
4 0.54 0.74 12 0.75 0.95
5 0.52 0.72 13 0.93 1.13
6 0.60 0.80 14 1.05 1.25
7 0.66 0.86 15 1.22 1.42
8 0.72 0.92 16 0.82 1.02

Table 2. RMSECVs for iPLS models with different interval numbers of Cu

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Table 2. RMSECVs for iPLS models with different interval numbers of Cu

区间个数	区间序号	RMSECV	变量个数
10	7	0.023 3	582
11	6	0.033 5	529
12	5	0.026 0	485
13	5	0.026 9	448
14	11	0.036 5	415
15	10	0.023 3	388
16	6	0.034 8	364
17	6	0.026 2	343
18	9	0.019 7	324
19	9	0.018 6	306
20	10	0.020 3	291
21	10	0.019 0	277
22	11	0.020 1	265
23	15	0.019 7	253
24	12	0.020 4	242
25	25	0.031 8	232

Table 3. RMSECVs for BiPLS with different interval numbers of Cu

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Table 3. RMSECVs for BiPLS with different interval numbers of Cu

区间个数	最小RMSECV	区间个数	变量数
10	0.023 3	1	582
11	0.020 8	5	2 645
12	0.022 1	4	1 940
13	0.022 4	5	2 238
14	0.018 4	6	2 494
15	0.025 4	6	2 327
16	0.019 8	10	3 639
17	0.019 0	8	2 739
18	0.020 6	9	2 910
19	0.018 9	9	2 756
20	0.022 1	7	2 037
21	0.014 3	7	1 940
22	0.015 4	4	1 059
23	0.015 1	10	2 530
24	0.015 8	10	2 424
25	0.016 1	9	2 094

Table 4. Comparison of PLS, iPLS and BiPLS models for Cu element
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Table 4. Comparison of PLS, iPLS and BiPLS models for Cu element
算法类别变量数量校正集测试集
$R_{C}^{2}$ RMSEC $R_{P}^{2}$ RMSEP RPD
PLS 5 819 0.978 4 0.034 2 0.930 0 0.041 8 2.5
iPLS 253 0.998 1 0.010 3 0.865 7 0.053 8 2.8
BiPLS 1 940 0.996 3 0.014 1 0.944 9 0.036 3 3.0

Table 5. Comparison of PLS, iPLS and BiPLS models for Ni element
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Table 5. Comparison of PLS, iPLS and BiPLS models for Ni element
算法类别变量数量校正集测试集
$R_{C}^{2}$ RMSEC $R_{P}^{2}$ RMSEP RPD
PLS 5 819 0.685 5 0.148 8 0.797 3 0.181 5 0.3
iPLS 253 0.997 9 0.010 6 0.830 4 0.060 7 2.5
BiPLS 1 940 0.994 4 0.017 5 0.933 7 0.041 4 2.6

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Shao-nong ZHU, Yu DING, Yu-juan CHEN, Fan DENG, Fei-fan CHEN, Fei YAN. Quantitative Analysis of Cu and Ni in Oil-Contaminated Soil by LIBS Combined With Variable Selection Method and PLS[J]. Spectroscopy and Spectral Analysis, 2020, 40(12): 3812

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