Quantitative Analysis of Heavy Metals in Water with LIBS Based on Signal-to-Background Ratio
HU Li1,2, ZHAO Nan-jing1*, LIU Wen-qing1, FANG Li1, ZHANG Da-hai1, WANG Yin1, MENG De-shuo1, YU Yang1, MA Ming-jun1
1. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China 2. School of Electronic and Information Engineering, Hefei Normal University，Hefei 230011, China
Abstract：There are many influence factors in the precision and accuracy of the quantitative analysis with LIBS technology. According to approximately the same characteristics trend of background spectrum and characteristic spectrum along with the change of temperature through in-depth analysis, signal-to-background ratio(S/B) measurement and regression analysis could compensate the spectral line intensity changes caused by system parameters such as laser power, spectral efficiency of receiving. Because the measurement dates were limited and nonlinear, we used support vector machine (SVM) for regression algorithm. The experimental results showed that the method could improve the stability and the accuracy of quantitative analysis of LIBS, and the relative standard deviation and average relative error of test set respectively were 4.7% and 9.5%. Data fitting method based on signal-to-background ratio(S/B) is Less susceptible to matrix elements and background spectrum etc, and provides data processing reference for real-time online LIBS quantitative analysis technology.
Key words：Heavy metal in water;LIBS;Signal-to-background ratio;Quantitative analysis
胡 丽1, 2，赵南京1*，刘文清1，方 丽1，张大海1，王 寅1，孟德硕1，余 洋1，马明俊1 . 基于信背比拟合的水体重金属LIBS定量分析研究 [J]. 光谱学与光谱分析, 2015, 35(07): 2017-2020.
HU Li1,2, ZHAO Nan-jing1*, LIU Wen-qing1, FANG Li1, ZHANG Da-hai1, WANG Yin1, MENG De-shuo1, YU Yang1, MA Ming-jun1 . Quantitative Analysis of Heavy Metals in Water with LIBS Based on Signal-to-Background Ratio. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(07): 2017-2020.
[1] Sadegh M，Cheri S H. Applied Optics, 2011, 50(9): 1227. [2] SUN Dui-xiong, SU Mao-gen, DONG Chen-zhong(孙对兄, 苏茂根, 董晨钟). Acua Physica Sinica(物理学报)，2010, 59(7): 4571. [3] LU Cui-ping, LIU Wen-qing, ZHAO Nan-jing，et al(鲁翠萍, 刘文清, 赵南京，等). Acta Physica Sinica(物理学报)，2011, 60(4): 45206. [4] WANG Chun-long, LIU Jian-guo, ZHAO Nan-jing，et al(王春龙，刘建国，赵南京，等). Acta Phys. Sin.(物理学报)，2013, 62(12). [5] XIE Cheng-li(谢承利). Huazhong University of Seience and Technology(华中科技大学)，2009. [6] David A. Cremers and Leon J. Radziemski. Cambridge，2006. [7] WANG Chun-long, LIU Jian-guo, ZHAO Nan-jing，et al(王春龙，刘建国，赵南京，等). Chinese J. Laser(中国激光)，2011, 38(11). [8] XIU Jun-shan, HOU Hua-ming, ZHENG Rong-er，et al(修俊山，侯华明，郑荣儿，等). Chinese J. Laser(中国激光)，2011, 38(8): 0815003. [9] LU Cui-ping(鲁翠萍). Hefei Institute of Physical Science, Chinese Academy of Sciences(中国科学院合肥物质科学研究院). 2011. [10] Body D. Spectrochimica Acta Part B，2001: 725. [11] Bekefi G. York: Wiley, 1966. [12] David A C. Radziemski Leon J. Cambridge，2006. [13] Editorial emission spectrum analysis(发射光谱分析编写组). Beijing: Metallurgical Industry Press(北京：冶金工业出版社)，1977. [14] XU Hong-min, WANG Hai-ying, LIANG Jin，et al(徐红敏, 王海英, 梁 瑾，等). Journal of Beijing Institute of Petrochemical(北京石油化工学院学报), 2010, 18(1): 62. [15] CHEN Guo, ZHOU Jia(陈 果, 周 伽). Acta Metrol. Sin.(计量学报)，2008, 29(1): 92. [16] GUO Shui-xia, WANG Yi-fu, CHEN An(郭水霞, 王一夫, 陈 安). Comput. Engineer. Appl.(计算机工程与应用), 2007, 43(5). [17] Ministry of Environmental Protection(环境保护部). Environmental Monitoring Analysis Method Standard System Revision Technical Guidance(环境监测分析方法标准制修订技术导则)，2010.
