Analysis of Ba Content in Soil Based on Cavity Confinement LIBS Combined with Multivariate Regression

Yekun Liu; Xiaojian Hao; Yanwei Yang; Peng Sun

doi:10.3788/LOP202259.0530005

Laser & Optoelectronics Progress, Volume. 59, Issue 5, 0530005(2022)

Analysis of Ba Content in Soil Based on Cavity Confinement LIBS Combined with Multivariate Regression

Yekun Liu^1,1、">, Xiaojian Hao^1、*, Yanwei Yang^{1,1,2,2、">">}, and Peng Sun^1,1、">

¹Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan , Shanxi 030051, China

²Department of Physics, Luliang University, Lüliang, Shanxi 033000, China

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Figures & Tables(11)

Fig. 1. Cavity confinement LIBS experimental device diagram

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Fig. 2. Comparison diagram of Ba element spectra under traditional LIBS and CC-LIBS

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Fig. 3. Spectral intensity of Ba Ⅱ 495.709 nm change with delay time under two LIBS conditions

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Fig. 4. SNR of Ba element under different conditions

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Fig. 5. Calibration curves of Ba element by spectral line intensity integration method. (a) LIBS; (b) CC-LIBS

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Fig. 6. Cumulative contribution rate of principal components

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Fig. 7. Calibration curves of Ba element with multivariate analysis method. (a) PCR; (b) ANN

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Table 1. Contents of Ba element in soil samples
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Table 1. Contents of Ba element in soil samples
Sample number Content of Ba element /（mg·kg^-1）
1 1100
2 750
3 450
4 800
5 500
6 400
7 350
8 200
9 160

Table 2. Prediction results of Ba element content in soil samples by spectral line integration method

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Table 2. Prediction results of Ba element content in soil samples by spectral line integration method

Methods	Sample number	Real Ba contents	Predicted Ba contents	R $_{c}^{2}$	Relative Ba error /%	Mean relative error /%
Spectral line intensity integral	4	800	990.30	0.63	23.78	47.52
	6	400	595.77		48.94
	8	200	339.69		69.85
CC-LIBS and spectral line intensity integral	4	800	923.46	0.84	15.43	23.44
	6	400	485.09		21.27
	8	200	267.24		33.62

Table 3. LOD of Ba element in soil samples
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Table 3. LOD of Ba element in soil samples
Codintion δ LOD /（mg·kg^-1）
Traditional LIBS 5.006 64.73
CC-LIBS 9.845 38.76

Table 4. Prediction results of Ba element content in soil samples by multivariate analysis method

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Table 4. Prediction results of Ba element content in soil samples by multivariate analysis method

Method	Sample number	Real Ba contents	Predicted Ba contents	R $_{c}^{2}$	Relative Ba error /%	R $_{p}^{2}$	Mean Relative error /%
CC-LIBS+PCR	4	800	819.41	0.941	2.42	0.734	9.93
	6	400	432.84		8.21
	8	200	161.67		19.16
CC-LIBS+ANN	4	800	790.37	0.999	1.20	0.949	5.35
	6	400	373.11		6.72
	8	200	216.31		8.15

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Yekun Liu, Xiaojian Hao, Yanwei Yang, Peng Sun. Analysis of Ba Content in Soil Based on Cavity Confinement LIBS Combined with Multivariate Regression[J]. Laser & Optoelectronics Progress, 2022, 59(5): 0530005

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Paper Information

Category: Spectroscopy

Received: Jul. 6, 2021

Accepted: Sep. 13, 2021

Published Online: Mar. 8, 2022

The Author Email: Hao Xiaojian (NUOCHXJ69@163.com)

DOI:10.3788/LOP202259.0530005

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Contents of Ba element in soil samples

Table 1. Contents of Ba element in soil samples

Table 2. Prediction results of Ba element content in soil samples by spectral line integration method

Table 2. Prediction results of Ba element content in soil samples by spectral line integration method

Table 3. LOD of Ba element in soil samples

Table 3. LOD of Ba element in soil samples

Table 4. Prediction results of Ba element content in soil samples by multivariate analysis method

Table 4. Prediction results of Ba element content in soil samples by multivariate analysis method