双脉冲激光诱导土壤中Pb和Ba光谱增强研究
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摘要
为获得共线双脉冲激发方式对土壤中Pb和Ba元素的谱线增强效果,研究了1064nm单脉冲和(355nm+1064nm),(1064nm+355nm)共线双脉冲三种激发方式下,谱线强度随采集延迟时间的变化规律和谱线增强倍数随双脉冲时间间隔的变化规律。研究发现,与单脉冲激发方式相比,在双脉冲激发方式下,谱线Pb I 405.78nm和Ba I 553.55nm强度的最大增强倍数分别为5和8。该研究结果为检测土壤中重金属元素提供了参考。
In order to explore the enhancement effect of collinear dual-pulse excitation on the spectral intensity of Pb and Ba elements in soil,the variations of spectral intensity with the acquisition delay time and spectral enhancement times with the time interval of dual-pulses under the three excitation modes of 1064 nm single pulse,(355 nm+1064 nm)and(1064 nm+355 nm)collinear dual-pulses were studied.The results show that,compared to a single 1064 nm pulse,maximum enhancements by times of 5 for the Pb I 405.78 nm and 8 for the Ba I 553.55 nm were observed under the mode of dual-pulses.The results provide a reference for the detection of heavy metals in soil.
In order to explore the enhancement effect of collinear dual-pulse excitation on the spectral intensity of Pb and Ba elements in soil,the variations of spectral intensity with the acquisition delay time and spectral enhancement times with the time interval of dual-pulses under the three excitation modes of 1064 nm single pulse,(355 nm+1064 nm)and(1064 nm+355 nm)collinear dual-pulses were studied.The results show that,compared to a single 1064 nm pulse,maximum enhancements by times of 5 for the Pb I 405.78 nm and 8 for the Ba I 553.55 nm were observed under the mode of dual-pulses.The results provide a reference for the detection of heavy metals in soil.
引文
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[3] Cui Minchao,Deguchi Y,Wang Zhenzhen,et al.Enhancement and stabilization of plasma using collinear long-short double-pulse laser-induced breakdown spectroscopy[J].Spectrochimica Acta Part B Atomic Spectroscopy,2018,142:14-22.
[4] Song Chao,Gao Xun,Shao Yan.Pre-ablation laser parameter effects on the spectral enhancement of 1064nm/1064nm dual-pulse laser induced breakdown spectroscopy[J].Optik-International Journal for Light and Electron Optics,2016,127(8):3979-3983.
[5] Gu Yanhong,Zhao Nanjing,Ma Mingjun,et al.Mapping analysis of heavy metal elements in polluted soils using laser-induced breakdown[J].Spectroscopy and Spectral Analysis,2018,38(3):982-989.
[6] Popov A M,Labutin T A,Zaytsev S M,et al.Determination of Ag,Cu,Mo and Pb in soils and ores by laser-induced breakdown spectrometry[J].Journal of Analytical Atomic Spectrometry,2014,29(10):1925-1933.
[7] Zaytsev S M,Krylov I N,Popov A M,et al.Accuracy enhancement of a multivariate calibration for lead determination in soils by laser induced breakdown spectroscopy[J].Spectrochimica Acta Part B Atomic Spectroscopy,2018,140:65-72.
[8]杜闯,高勋,邵妍,等.土壤中重金属元素的双脉冲激光诱导击穿光谱研究[J].物理学报,2013,62:045202.(Du Chuang,Gao Xun,Shao Yan,et al.Analyses of heavy metals by soils using dual-pulsed laser induced breakdown spectroscopy.Acta Physica Sinica,2013,62:045202)
[9] Yu Yang,Zhao Nanjing,Fang Li,et al.Comparative study on laser induced breakdown spectroscopy based on single pulse and re-heating orthogonal dual pulse[J].Spectroscopy and Spectral Analysis,2017,37(2):588-593.
[10] Burakov V S,Tarasenko N V,Nedelko M I,et al.Analysis of lead and sulfur in environmental samples by double pulse laser induced breakdown spectroscopy[J].Spectrochimica Acta Part B Atomic Spectroscopy,2009,64(2):141-146.
[11] Nicolodelli G,Senesi G S,Romano R A,et al.Signal enhancement in collinear double-pulse laser-induced breakdown spectroscopy applied to different soils[J].Spectrochimica Acta Part B Atomic Spectroscopy,2015,111:23-29.
[12] Stonge L,Detalle V,Sabsabi M.Enhanced laser-induced breakdown spectroscopy using the combination of fourth-harmonic and fundamental Nd:YAG laser pulses[J].Spectrochimica Acta Part B Atomic Spectroscopy,2002,57(1):121-135.
[13] Sobral H,Villagran M M,Navarro G R,et al.Temporal evolution of the shock wave and hot core air in laser induced plasma[J].Applied Physics Letters,2000,77(20):3158-3160.
[14] Giacomo A D,Dell A M,Pascale O D,et al.From single pulse to double pulse ns-laser induced breakdown spectroscopy under water:Elemental analysis of aqueous solutions and submerged solid samples[J].Spectrochimica Acta Part B Atomic Spectroscopy,2007,62(8):721-738.