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Atomic spectroscopy with surface wave plasmas.

J Hubert1, S Bordeleau, K C Tran

  • 1Départment de Chimie and Départment de Physique, Université de Montréal, C.P. 6128, Succursale Centre Ville, H3C 3J7, Montréal, Qc, Qc, Canada.

Analytical and Bioanalytical Chemistry
|June 1, 1996
PubMed
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Microwave-induced plasmas, especially surface wave plasmas, show promise as detectors for elemental analysis using atomic emission spectrometry. Optimizing helium-nitrogen mixtures in high-power plasmas significantly improves detection limits for non-metals like bromine.

Area of Science:

  • Analytical Chemistry
  • Plasma Physics
  • Spectroscopy

Background:

  • Microwave-induced plasmas (MIPs) are explored as sensitive detectors in atomic emission spectrometry (AES).
  • Surface wave plasmas (SWPs) offer potential for elemental analysis due to their stability and efficiency.
  • Previous research has focused on MIPs, but SWPs require further investigation for specific analytical applications.

Purpose of the Study:

  • To review the application of microwave-induced plasmas, particularly SWPs, as detectors in AES for elemental analysis.
  • To investigate the analytical performance of SWPs as gas chromatographic detectors for non-metals.
  • To study the excitation behavior of non-metals in helium-based mixed gas-plasmas and optimize detection limits.

Main Methods:

  • Utilized surface wave plasmas (SWPs) generated at low radio frequency (RF) power.

Related Experiment Videos

  • Employed SWPs as detectors in conjunction with gas chromatography (GC).
  • Analyzed non-metal detection using Fourier transform spectrometry and a two-channel filter unit.

    • Main Results:

    • Demonstrated the feasibility of using SWPs as GC detectors for non-metal analysis.
    • Systematically investigated the excitation behavior of non-metals in helium-nitrogen mixed gas-plasmas.
    • Achieved a nine-fold improvement in detection limits for bromine by operating in a high-power (900 W) helium-nitrogen (0.1-0.2%) plasma.

    Conclusions:

    • Surface wave plasmas are effective detectors for elemental analysis in atomic emission spectrometry.
    • Optimizing plasma conditions, such as power and gas composition, significantly enhances detection capabilities for specific elements.
    • The study highlights the potential of tailored plasma environments for improving the sensitivity of non-metal detection.