光谱学与光谱分析 |
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Quantitative Analysis of Cu in Water by Collinear DP-LIBS |
ZHENG Mei-lan, YAO Ming-yin, CHEN Tian-bing, LIN Yong-zeng, LI Wen-bing, LIU Mu-hua* |
Optics-Electrics Application of Biomaterials Laboratory, Jiangxi Agricultural University, Nanchang 330045, China |
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Abstract The purpose of this research is to study the influence of double pulse laser induced breakdown spectroscopy (DP-LIBS) on the sensitivity of Cu in water. The water solution of Cu was tested by collinear DP-LIBS in this article. The results show that spectral intensity of Cu can be enhanced obviously by DP-LIBS, compared with single pulse laser induced breakdown spectroscopy (SP-LIBS). Besides, the experimental results were significantly impacted by delay time between laser pulse and spectrometer acquisition, delay time of double laser pulse and energy of laser pulse and so on. The paper determined the best conditions for DP-LIBS detecting Cu in water. The optimal acquisition delay time was 1 380 ns. The best laser pulse delay time was 25 ns. The most appropriate energy of double laser pulse was 100 mJ. Characteristic analysis of spectra of Cu at 324.7 and 327.4 nm was done for quantitative analysis. The detection limit was 3.5 μg·mL-1 at 324.7 nm, and the detection limit was 4.84 μg·mL-1 at 327.4 nm. The relative standard deviation of the two characteristic spectral lines was within 10%. The calibration curve of characteristic spectral line, established by 327.4 nm, was verified with 500 μg·mL-1 sample. Concentration of the sample was 446 μg·mL-1 calculated by the calibration curve. This research shows that the detection sensitivity of Cu in water can be improved by DP-LIBS. At the same time, it had high stability.
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Received: 2013-08-25
Accepted: 2014-01-17
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Corresponding Authors:
LIU Mu-hua
E-mail: suikelmh@sohu.com
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