[1] Luo Y M, Teng Y. Status of soil pollution degradation and countermeasures in China[J]. Soils, 38, 505-508(2006).
[2] Luo W, Tian P, Dong W T et al. Detection of Pb contents in soil using LIBS coupled with univariate calibration curve methods[J]. Spectroscopy and Spectral Analysis, 41, 886-891(2021).
[3] Lin X M, Cao Y Y, Zhao S Y et al. Quantitative analysis of Cr in soil by laser-induced breakdown spectroscopy[J]. Spectroscopy and Spectral Analysis, 41, 875-879(2021).
[4] Du C, Gao X, Shao Y et al. Analyses of heavy metals by soil using dual-pulsed laser induced breakdown spectroscopy[J]. Acta Physica Sinica, 62, 045202(2013).
[5] Yu D, Sun Y, Feng Z S et al. Effects of the combination of sample temperature and spatial confinement on laser-induced breakdown spectroscopy[J]. Chinese Optics, 14, 336-343(2021).
[6] Wang Y P, Wang Q Y, Chen A M et al. Influence of sample temperature on nanosecond laser-induced Cu plasma spectra[J]. Optik, 230, 166338(2021).
[7] Babushok V I, DeLucia F C, Jr, Gottfried J L et al. Double pulse laser ablation and plasma: laser induced breakdown spectroscopy signal enhancement[J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 61, 999-1014(2006).
[8] Lin Z H, Li R H, Jiang Y H et al. Signal enhancement in target-enhanced orthogonal double-pulse laser-induced breakdown spectroscopy[J]. Chinese Journal of Lasers, 48, 2411001(2021).
[9] Wang Z, Hou Z Y, Lui S L et al. Utilization of moderate cylindrical confinement for precision improvement of laser-induced breakdown spectroscopy signal[J]. Optics Express, 20, A1011-A1018(2012).
[10] Liu Y K, Hao X J, Yang Y W et al. Analysis of Ba content in soil based on cavity confinement LIBS combined with multivariate regression[J]. Laser & Optoelectronics Progress, 59, 0530005(2022).
[11] Dai Y Y, Yu D, Li Y H et al. Effect of different numbers of spatial confinement walls on laser-induced Cu plasma spectra[J]. Chinese Journal of Lasers, 49, 0611001(2022).
[12] Li C, Gao X, Li Q et al. Spectral enhancement of laser-induced breakdown spectroscopy in external magnetic field[J]. Plasma Science and Technology, 17, 919-922(2015).
[13] Nassef O A, Elsayed-Ali H E. Spark discharge assisted laser induced breakdown spectroscopy[J]. Spectrochimica Acta Part B: Atomic Spectroscopy, 60, 1564-1572(2005).
[14] Kiris V V, Tarasenko N V, Nevar E A et al. Enhancement of analytical signal of laser induced breakdown spectroscopy by deposition of gold nanoparticles on analyzed sample[J]. Journal of Applied Spectroscopy, 86, 900-907(2019).
[15] Yu D, Sun Y, Feng Z S et al. Improving emission intensity of femtosecond laser-induced breakdown spectroscopy by using circular polarization[J]. Chinese Journal of Lasers, 48, 0111001(2021).
[16] Huang Y C. Research on the detection method of heavy metals in soil under the enhancement of LIBS signal[D], 30-35(2020).
[17] Liu X D. Application of laser induced breakdown spectroscopy in the detection of soil and plant information[D], 98-100(2021).
[18] Meng D S, Zhao N J, Ma M J et al. Research on Boltzmann plot used in soil laser induced breakdown spectroscopy for spectral line identification[J]. Laser & Optoelectronics Progress, 52, 103004(2015).
