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Related Experiment Videos

Liquid-interfaced oscillating glow discharge detector for a flowing liquid system

C J Herring1, E H Piepmeier

  • 1Department of Chemistry, Oregon State University, Corvallis 97331-4003, USA.

Analytical Chemistry
|March 1, 1995
PubMed
Summary

A novel liquid-interfaced oscillating glow discharge detector achieves femtomole and picomole sensitivity for potassium nitrate and sucrose. This detector utilizes a unique glow discharge in argon, offering high-frequency oscillations for sensitive detection in aqueous solutions.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Spectroscopy

Background:

  • Traditional detectors often lack sensitivity for trace analytes.
  • Glow discharge techniques offer potential for sensitive elemental and molecular detection.
  • Liquid-interfaced detection methods can bridge the gap between solution-based samples and gas-phase detection.

Purpose of the Study:

  • To develop and characterize a novel liquid-interfaced oscillating glow discharge detector.
  • To evaluate the detector's sensitivity and response to specific analytes.
  • To investigate the physical characteristics of the liquid-interfaced glow discharge.

Main Methods:

  • Formation of a glow discharge in an argon atmosphere at ambient pressure.
  • Utilizing a platinum anode and an aqueous conducting solution as the cathode.

Related Experiment Videos

  • Injecting potassium nitrate and sucrose into a flowing aqueous eluent.
  • Monitoring frequency and current responses of the detector.

    • Main Results:

    • The detector demonstrated frequency response to femtomole quantities of potassium nitrate.
    • The detector showed current response to picomole quantities of sucrose.
    • Detailed observations of the liquid-interfaced glow discharge at varying electrode distances were recorded.
    • High-frequency oscillations within the glow discharge were observed and described.

    Conclusions:

    • The developed liquid-interfaced oscillating glow discharge detector offers high sensitivity for trace analytes in aqueous solutions.
    • The detector's performance is suitable for quantitative analysis of specific ions and molecules.
    • The study provides insights into the behavior of liquid-interfaced glow discharges and their potential applications.