Quantitative analysis of lead in aqueous solutions by ultrasonic nebulizer assisted laser induced breakdown spectroscopy

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• 作者：Shi-Lei Zhong 钟石磊 ; Yuan Lu 卢渊 ; Wei-Jin Kong 孔金伟 ; Kai Cheng 程凯…
• 关键词：laser ; induced breakdown spectroscopy (LIBS) ; ultrasonic nebulizer ; quantitative analysis ; water solution ; plasma diagnostics
• 刊名：Frontiers of Physics
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：11
• 期：4
• 全文大小：451 KB
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• 作者单位：Shi-Lei Zhong 钟石磊 (1) (2)
  Yuan Lu 卢渊 (2)
  Wei-Jin Kong 孔金伟 (1)
  Kai Cheng 程凯 (2)
  Ronger Zheng 郑荣儿 (2)
  
  1. College of Physics Science, Qingdao University, Qingdao, 266071, China
  2. Optics and Optoelectronics Laboratory, Ocean University of China, Qingdao, 266100, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Chinese Library of Science
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：2095-0470

文摘

In this study, an ultrasonic nebulizer unit was established to improve the quantitative analysis ability of laser-induced breakdown spectroscopy (LIBS) for liquid samples detection, using solutions of the heavy metal element Pb as an example. An analytical procedure was designed to guarantee the stability and repeatability of the LIBS signal. A series of experiments were carried out strictly according to the procedure. The experimental parameters were optimized based on studies of the pulse energy influence and temporal evolution of the emission features. The plasma temperature and electron density were calculated to confirm the LTE state of the plasma. Normalizing the intensities by background was demonstrated to be an appropriate method in this work. The linear range of this system for Pb analysis was confirmed over a concentration range of 0–4,150ppm by measuring 12 samples with different concentrations. The correlation coefficient of the fitted calibration curve was as high as 99.94% in the linear range, and the LOD of Pb was confirmed as 2.93ppm. Concentration prediction experiments were performed on a further six samples. The excellent quantitative ability of the system was demonstrated by comparison of the real and predicted concentrations of the samples. The lowest relative error was 0.043% and the highest was no more than 7.1%. Keywords laser-induced breakdown spectroscopy (LIBS) ultrasonic nebulizer quantitative analysis water solution plasma diagnostics