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首页> 外文会议>2015 International Conference on Optical Instruments and Technology: Advanced Lasers and Applications >Trace element analysis of aqueous samples by laser-induced breakdown spectroscopy based on pre-concentration of electrospray
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Trace element analysis of aqueous samples by laser-induced breakdown spectroscopy based on pre-concentration of electrospray

机译：基于电喷雾预浓缩的激光诱导击穿光谱法分析水性样品中的痕量元素

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摘要

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 MnSO_4 as sample. The surface of filter paper is sprayed with MnSO_4 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.
机译：激光诱导击穿光谱法（LIBS）具有快速和多种检测能力，是现场在线分析的强大工具。但是在检测低浓度水溶液中的痕量样品方面，液体介质的湍流，散射，吸收和冷却作用限制了其性能。传统方法包括液体喷射，液固转化和在其他介质上的预浓缩，但样品制备过程复杂且耗时。在这项工作中，我们提出了一种实现预浓缩的新方法，其中使用了滤纸和电喷雾电离（ESI）。在我们的实验中，我们选择MnSO_4作为样品。通过ESI用不同浓度的MnSO 4水溶液喷雾滤纸表面。脉冲激光聚焦在滤纸的表面，在聚焦区域形成等离子体。通过光纤，光谱仪检测到等离子体的光谱。 ESI系统，脉冲发生器系统和PC上的UI是自制的。分析了Mn在257.6nm，259.4nm和260.6nm处的光谱线。结果表明，在257.6nm处的检出限低于ppb，校准曲线的R2大于0.93。与传统方法（如浸泡和滴注处理）相比，我们的方法可以通过简单地延长喷涂时间来提高样品的浓度，从而实现更高的信噪比（SNR）和更低的检测下限（LOD）。此外，每次检测中样品溶液的消耗低至几百微升。

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  • 来源
  • 会议地点 Beijing(CN)
  • 作者

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

  • 作者单位

    Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China 518055;

    Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China 518055;

    Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China 518055;

    Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China 518055;

    Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China 518055;

    Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China 518055,State Key Laboratory of Precision Measure Technology and Instruments, Tsinghua University, Beijing, China 100084;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    LIBS; electrospray; filter paper; aqueous solution; pre-concentration;

    机译：LIBS；电喷雾过滤纸;水溶液预浓缩;

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