Effect of spatial confinement on Pb measurements in soil by femtosecond laser-induced breakdown spectroscopy
- 13 Downloads
This study investigates the spatial confinement effect on Pb measurements in soil by femtosecond laser-induced breakdown spectroscopy (fs-LIBS). Spatial confinement within a cylindrical cavity significantly enhanced the intensities of the Pb plasma emission spectrum and the enhancement increased with decreasing diameter of the cylindrical cavity. When the cavity diameter was increased from 3 to 6 mm, the spectral emission enhancement was more delayed and the spatial confinement effect was weakened. The limit of detection (LOD), coefficient of determination (R2), relative standard deviation (RSD), and root mean squared error of cross-validation (RMSECV) were 8.85 ± 0.16 mg/kg, 98.34%, 4.98%, and 0.45%, respectively in the 3 mm diameter cavity and 33.16 ± 1.45 mg/kg, 97.66%, 8.21%, and 0.54%, respectively, in the unconfined measurements. The cylindrical cavity improved the detection sensitivity (as evidenced by the LODs) and the detection accuracy (as evidenced by the RMSECV and RSD values) of fs-LIBS. Overall, the spatial confinement method promises to improve the analytical figures of merit of the fs-LIBS technology.
This research was financially supported by the National Natural Science Foundation of China (61575030), Natural Science Foundation of Jilin province (20180101283JC), and Department of education of Jilin Province (JJKH20190539KJ) and Funds from CUST (Grant no. XJJLG-2017-10). We thank Novella from Enago (www.enago.cn) for editing the English text of a draft of this manuscript.
- 2.L.B. Guo, X.Y. Li, W. Xiong, X.Y. Zeng, Y.F. Lu, Front Phys-beijing 11, 209–215 (2016)Google Scholar