Chinese Optics, Volume. 16, Issue 1, 103(2023)
Quantitative analysis of thorium in graphite using femtosecond laser-induced breakdown spectroscopy
Fig. 1. Schematic diagram of the experimental setup for proposed femtosecond LIBS
Fig. 2. (a) LIBS spectra obtained by the with moving method and without moving method; (b) reproducibility of the Th I 396.21 nm line from five measurements
Fig. 3. The time-resolved spectra for the sample 5# at laser energy of 0.5 mJ
Fig. 4. (a)Effect of laser pulse energy on the LIBS spectra; (b) SBR and Peak intensity of the Th I 396.21 nm line as a function of laser pulse energy
Fig. 5. LIBS spectra as a function of Th concentration: (a) C I 247.85 nm; (b)~(f) emission lines of Th
Fig. 6. The peak area and peak intensity for Th I 394.42 nm line as a function of pulse energy
Fig. 7. The performance of basic calibration method for sample 5#: (a)prediction concentrations; (b)relative errors
Fig. 8. Calibration curves with C I 247.85 nm line as the internal standard line
Fig. 9. The performance of internal standard for sample 5#: (a)prediction concentrations; (b)relative errors
Table 1. Fitted parameters from the curves for analytical lines using exponential equation
View tableView in ArticleTable 1. Fitted parameters from the curves for analytical lines using exponential equation
Area Intensity 394.42 nm 396.21 nm 766.53 nm 394.42 nm 396.21 nm 766.53 nm Y0 117.82 182.75 330.22 568.25 960.34 551.86 A −108.81 −162.09 −326.49 −528.86 −826.96 −534.61 t 8.27 7.78 14.62 6.04 6.07 10.25 R2 0.994 0.996 0.989 0.990 0.981 0.993
Table 2. Fitted parameters from the calibration curves for analytical lines in the lower concentration region
View tableView in ArticleTable 2. Fitted parameters from the calibration curves for analytical lines in the lower concentration region
Area Intensity 394.42 nm 396.21 nm 766.53 nm 394.42 nm 396.21 nm 766.53 nm a 13.04 26.99 8.62 65.05 0.218 26.08 b 8.04 0.135 16.31 49.06 13.24 32.31 R2 0.996 0.959 0.897 0.950 0.931 0.978
Table 3. Fitted parameters from the calibration curves for analytical lines using internal standard
View tableView in ArticleTable 3. Fitted parameters from the calibration curves for analytical lines using internal standard
Rarea Rintensity 394.42 nm 396.21 nm 766.53 nm 394.42 nm 396.21 nm 766.53 nm a 0.12 0.24 0.04 0.08 0.22 0.02 b 0.08 0.13 0.19 0.06 0.10 0.05 R2 0.972 0.959 0.929 0.928 0.921 0.941
Table 4. Fitted parameters of the calibration curves using internal standard and the results of the prediction for 9# sample
View tableView in ArticleTable 4. Fitted parameters of the calibration curves using internal standard and the results of the prediction for 9# sample
Creal / wt% Wavelength/nm 766.53 a b $ {R}^{2} $ Cprediction / wt% ER/% 35.12 Peak area −0.04 0.23 0.951 33.99 3.2 Peak intensity 0.0005 0.06 0.941 29.75 15.3
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Xiao-liang LIU, Lan WANG, Ling-ling PENG, Xiao-yan LI, Yun-hai LIU, Chun-yan ZOU. Quantitative analysis of thorium in graphite using femtosecond laser-induced breakdown spectroscopy[J]. Chinese Optics, 2023, 16(1): 103
Category: Original Article
Received: Apr. 25, 2022
Accepted: --
Published Online: Jul. 5, 2023
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