J4 ›› 2014, Vol. 31 ›› Issue (1): 99-106.

• Laser Applications • Previous Articles     Next Articles

Analysis of Cu in liquid jet using Double Laser Induced Breakdown Spectroscopy

Hu Zhenhua, Zhang Qiao, Ding Lei, Wang Yingping, Zheng Haiyang, Fang Li   

  1. Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, China
  • Received:2013-07-02 Revised:2013-07-15 Published:2014-01-28 Online:2013-12-31

Abstract: In order to study the heavy metal elements in liquid by double pulse laser induced breakdown spectroscopy, double pulsed laser induced breakdown spectroscopy(DP-LIBS) was used, the LIBS characteristics of Cu elements in a vertical flow of aqueous solution of CuSO4 were measured and analyzed. Two Q-switched Nd:YAG lasers operating at 532nm was utilized to generate plasma on a flowing liquid surface, and plasma signal by detecting the CCD grating spectrometer. The experiment investigated gate delay, the delay time between two lasers of DP-LIBS. The results show that the intensity and SNR of Cu emission lines excited by double pulse is about 2 and 3.3 times than the intensity of line emission excited by the single pulse separately. When the delay time between two lasers at 2~3μs, emission line intensity reached maximum enhancement. The detection limit of metal ion in water solution under the optimized operation conditions was found to be 9.87mg/L for Cu, which is about 6 times than single pulse.

Key words: Spectroscopy, laser induced breakdown spectroscopy, double pulse, liquid jet, limmit of detection

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