Detection of Metallic Elements in Lubricating Oil by Substrate-Assisted Laser-Induced Breakdown Spectroscopy

Peichao Zheng; Guining Tan; Jinmei Wang; Huaidong Zhao; Ranning Liu

doi:10.3788/CJL201946.0711002

Chinese Journal of Lasers, Volume. 46, Issue 7, 0711002(2019)

Detection of Metallic Elements in Lubricating Oil by Substrate-Assisted Laser-Induced Breakdown Spectroscopy

Peichao Zheng^*, Guining Tan, Jinmei Wang^*, Huaidong Zhao, and Ranning Liu

Chongqing Key Laboratory of Photoelectronic Information Sensing and Transmitting Technology, College of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

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Figures & Tables(15)

Fig. 1. Schematic of LIBS experimental setup

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Fig. 2. Schematic of sample pretreatment procedure

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Fig. 3. Spectrum of Aluminum substrate with purity of 99.99%

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Fig. 4. Spectra in different wavelength ranges of 300 μg·g-1 standard oil and base oil. (a) 275-286 nm; (b) 330-338 nm; (c) 349-362 nm; (d) 424-430 nm

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Fig. 5. Spectra of Mg II 279.55 nm in different resting time. (a) 3 min; (b) 10 min

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Fig. 6. Spectral intensity and SBR of Mg II 279.55 nm as function of sampling volume

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Fig. 7. Spectral intensity and SBR as function of ICCD delay. (a) Mg II 279.55 nm; (b) Ti I 334.94 nm;(c) Ni I 352.45 nm; (d) Cr I 425.44 nm

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Fig. 8. Spectral intensity and SBR as function of laser energy. (a) Mg II 279.55 nm; (b) Ti I 334.94 nm;(c) Ni I 352.45 nm; (d) Cr I 425.44 nm

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Fig. 9. Calibration curves. (a) Mg II 279.55 nm; (b) Ti I 334.94 nm; (c) Ni I 352.45 nm; (d) Cr I 425.44 nm

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Table 1. Optimum spectral lines of Mg, Ti, Ni, and Cr for quantitative analysis
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Table 1. Optimum spectral lines of Mg, Ti, Ni, and Cr for quantitative analysis
Element Wavelength /nm Transitionprobability /(10⁸ s^-1) E_i /cm^-1 E_k /cm^-1
Mg 279.55 2.60 0.00 35760.88
Ti 334.94 1.68 393.45 30240.94
Ni 352.45 1.00 204.79 28569.20
Cr 425.44 0.315 0.00 23498.82

Table 2. RSD of Mg II 279.55 nm spectral signal intensity in different resting time
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Table 2. RSD of Mg II 279.55 nm spectral signal intensity in different resting time
Time /min 3 10 15 20 30
RSD /% 17.6 10.4 9.7 10.8 10.3

Table 3. Average thicknesses of oil film in different sampling volumes
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Table 3. Average thicknesses of oil film in different sampling volumes
Volumes /μL 100 200 300 400 500 600
Thickness /μm 21.9 43.9 65.8 87.8 109.7 131.6

Table 4. Parameters of calibration curves and standard deviation of background signals
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Table 4. Parameters of calibration curves and standard deviation of background signals
Elements s a R² Standard deviation σ
Mg 8.70×10² 2.37×10⁴ 0.978 9.00×10²
Ti 2.23×10² -4.81×10³ 0.984 6.47×10²
Ni 1.55×10² -2.03×10³ 0.979 9.73×10²
Cr 5.42×10² 3.30×10³ 0.970 1.10×10³

Table 5. LOD of Mg, Ti, Ni, and Cr elements μg·g-1
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Table 5. LOD of Mg, Ti, Ni, and Cr elements μg·g-1
Elements Mg Ti Ni Cr
LOD 3.10 8.17 18.79 6.10

Table 6. Mass ratio and relative error of Mg, Ti, Ni, and Cr in predicted oil samples

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Table 6. Mass ratio and relative error of Mg, Ti, Ni, and Cr in predicted oil samples

Sample mass ratio /(μg·g^-1)	Predicted mass ratio /(μg·g^-1)				Relative error /%
Sample mass ratio /(μg·g^-1)	Mg	Ti	Ni	Cr	Mg	Ti	Ni	Cr
50	44.16	57.94	66.09	40.46	-11.68	15.88	32.18	-19.08
150	163.82	131.13	177.90	172.90	9.21	-12.58	18.60	15.27
250	261.49	265.46	269.30	229.25	4.60	6.18	7.72	-8.30
350	327.00	367.95	330.69	368.43	-6.57	5.13	-5.52	5.27
450	472.99	428.57	430.69	431.56	5.11	-4.76	-4.29	-4.10

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Peichao Zheng, Guining Tan, Jinmei Wang, Huaidong Zhao, Ranning Liu. Detection of Metallic Elements in Lubricating Oil by Substrate-Assisted Laser-Induced Breakdown Spectroscopy[J]. Chinese Journal of Lasers, 2019, 46(7): 0711002

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Paper Information

Category: spectroscopy

Received: Mar. 4, 2019

Accepted: Mar. 28, 2019

Published Online: Jul. 11, 2019

The Author Email: Zheng Peichao (wangjm@cqupt.edu.cn), Wang Jinmei (wangjm@cqupt.edu.cn)

DOI:10.3788/CJL201946.0711002

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Optimum spectral lines of Mg, Ti, Ni, and Cr for quantitative analysis

Table 1. Optimum spectral lines of Mg, Ti, Ni, and Cr for quantitative analysis

Table 2. RSD of Mg II 279.55 nm spectral signal intensity in different resting time

Table 2. RSD of Mg II 279.55 nm spectral signal intensity in different resting time

Table 3. Average thicknesses of oil film in different sampling volumes

Table 3. Average thicknesses of oil film in different sampling volumes

Table 4. Parameters of calibration curves and standard deviation of background signals

Table 4. Parameters of calibration curves and standard deviation of background signals

Table 5. LOD of Mg, Ti, Ni, and Cr elements μg·g-1

Table 5. LOD of Mg, Ti, Ni, and Cr elements μg·g-1

Table 6. Mass ratio and relative error of Mg, Ti, Ni, and Cr in predicted oil samples

Table 6. Mass ratio and relative error of Mg, Ti, Ni, and Cr in predicted oil samples