Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (6): 909-913.doi: 10.1007/s40242-015-5210-3

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Quantitative Determination of Cr in Ink by Laser-induced Breakdown Spectroscopy(LIBS) Using ZnO as Adsorbent

WEI Jiao1,2, ZHANG Tianlong1,2, DONG Juan1,2, SHENG Liwen1,2, TANG Hongsheng1,2, YANG Xiaofeng2, LI Hua1,2,3   

  1. 1. Institute of Analytical, Northwest University, Xi'an 710069, P. R. China;
    2. College of Chemistry & Materials Science, Northwest University, Xi'an 710069, P. R. China;
    3. College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an 710065, P. R. China
  • Received:2015-05-28 Revised:2015-09-02 Online:2015-11-01 Published:2015-09-08
  • Contact: LI Hua E-mail:huali@nwu.edu.cn
  • Supported by:

    Supported by the National Special Fund for the Development of Major Scientific Instruments and Equipment of China (No.2011YQ030113), the National Natural Science Foundation of China(Nos.21175106, 21375105) and the Research Fund for the Doctoral Program of Higher Education of China(No.20126101110019).

Abstract:

Laser-induced breakdown spectroscopy(LIBS) technique was applied to detecting chromium in ink with ZnO as adsorbent, and the LIBS spectra were preprocessed by wavelet denoising. The laser energy and delay time were optimized depending on the signal-to-noise ratio(SNR) and intensity of three analysis atomic lines(Cr 425.43 nm, Cr 427.48 nm and Cr 428.97 nm). Compared with other analysis lines, atomic line of Cr 427.48 nm was selected as the analysis line for the quantitative analysis of Cr in ink as the calibration curve of it showed a better linear relationship (correlation coefficient R2=0.9778), and the relative error of Cr in the measured ink was 52.96%. Since the single spectral line used for calibration curve method is often influenced by matrix effect and other factors, partial least squares regression(PLS) as multivariate calibration method has been applied to predicting the concentration of Cr in ink, and the relative error of Cr in the measured ink was 10.48%. The result obtained from the PLS method was better than that from the calibration curve when comparing the relative error, demonstrating that, based on adsorbent, LIBS combined with PLS provides an effective, practical and convenient technique for the determination of trace element in aqueous solution.

Key words: Laser-induced breakdown spectroscopy, Zinc oxide, Partial least square, Chromium, Ink