Jinmei Wang, Zhi Yang, Peichao Zheng, Guanghui Chen, Xufeng Liu, Zhicheng Sun, Daming Dong, Hongwu Tian, Lianbo Guo. Analysis of Cu Elements in Soil by Spatially Constrained LIBS Combined with Resin Enrichment[J]. Chinese Journal of Lasers, 2025, 52(6): 0611001
- Chinese Journal of Lasers
- Vol. 52, Issue 6, 0611001 (2025)
Fig. 1. Diagram of LIBS experimental setup
Fig. 2. LIBS sample preparation process for detection of soil heavy metals
Fig. 3. Spectral line selection. (a) Comparison of spectra before and after enrichment of chelating resins; (b) comparison of spectral intensity between resin enrichment method and soil tableting method
Fig. 4. Effects of enrichment time on intensity values of Cu characteristic lines
Fig. 5. Effects of resin dosage on intensity values of Cu characteristic spectral lines
Fig. 6. Effects of pH value on intensity values of Cu characteristic lines
Fig. 7. Effects of laser energy on intensity values of Cu characteristic lines. (a) Cu I 324.75 nm; (b) Cu I 327.39 nm
Fig. 8. Effects of ICCD delay time on intensity values of Cu characteristic lines. (a) Cu I 324.75 nm; (b) Cu I 327.39 nm
Fig. 9. Space constraint device. (a) Enhancement effect of plasma; (b) V-shaped space constraint device
Fig. 10. Effects of spatial constraint on intensity values of Cu characteristic lines. (a) Cu I 324.75 nm; (b) Cu I 327.39 nm
Fig. 11. Comparison of calibration curves before and after adding spatial constraint. (a) Cu I 324.75 nm;(b) Cu I 327.39 nm
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Table 1. Comparison of analytical performance of different methods for detecting Cu elements in soil
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Table 2. Standard samples and their spiked recovery rates
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