Trace element analysis of aqueous samples by laser-induced breakdown spectroscopy based on pre-concentration of electrospray

Kai Ni; Yu Lei; Quan Yu; Jianan Li; Xiang Qian; Xiaohao Wang

doi:10.1117/12.2193270

5 August 2015 Trace element analysis of aqueous samples by laser-induced breakdown spectroscopy based on pre-concentration of electrospray

Kai Ni, Yu Lei, Quan Yu, Jianan Li, Xiang Qian, Xiaohao Wang

Author Affiliations +

Proceedings Volume 9621, 2015 International Conference on Optical Instruments and Technology: Advanced Lasers and Applications; 96210J (2015) https://doi.org/10.1117/12.2193270
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

Abstract

Laser-induced breakdown spectroscopy (LIBS) is characterized as a powerful tool in in-situ online analysis with its fast and multiple detecting abilities. But in the area of detecting trace sample in aqueous solution of low concentration, the turbulence, scattering, absorbance and cooling effect of liquid medium limits its performance. Traditional method includes liquid jet, liquid-solid transformation and pre-concentration on other medium, yet the procedure of sample preparation is complicated and time consuming. In this work, we propose a new method to achieve pre-concentration, in which filter paper and electro-spray ionization (ESI) are used. In our experiment, we choose MnSO₄ as sample. The surface of filter paper is sprayed with MnSO₄ aqueous solution of different concentration by an ESI. The pulsed laser is focused on the surface of filter paper and the plasma is formed in the focusing area. Through an optical fiber the spectrum of plasma is detected by a spectrometer. The ESI system, pulses generator system and the UI on PC are home-made. The spectra lines of Mn at 257.6nm, 259.4nm and 260.6nm are analyzed. Results show that the limit of detection at 257.6nm is sub-ppb and the R² of calibration curve is more than 0.93. Compared with traditional method, like soak and drip processing, our method can increase the concentration of the sample by simply expanding spraying time, achieving a higher signal-to-noise ratio (SNR) and a lower limit of detection (LOD). In addition, the consumption of sample solution is as low as several hundred μl in each detection.

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Kai Ni, Yu Lei, Quan Yu, Jianan Li, Xiang Qian, and Xiaohao Wang "Trace element analysis of aqueous samples by laser-induced breakdown spectroscopy based on pre-concentration of electrospray", Proc. SPIE 9621, 2015 International Conference on Optical Instruments and Technology: Advanced Lasers and Applications, 96210J (5 August 2015); https://doi.org/10.1117/12.2193270

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KEYWORDS

Optical filters

Spectroscopy

Laser induced breakdown spectroscopy

Manganese

Statistical analysis

Liquids

Signal to noise ratio

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