Evaluation of a radio frequency plasma for oxygen‐selective detection in capillary gas chromatography

Stig Pedersen‐Bjergaard; Tyge Greibrokk

doi:10.1002/jhrc.1240151009

Evaluation of a radio frequency plasma for oxygen‐selective detection in capillary gas chromatography

Stig Pedersen‐Bjergaard^*, Tyge Greibrokk

^*Corresponding author for this work

9 Citations (Scopus)

Abstract

A radio frequency plasma detector for capillary GC has been modified for oxygen‐selective detection. Purification of the plasma gas and purging of both ends of the discharge region with helium were crucial to minimizing oxygen background emission from impurities in the plasma. With a pure helium plasma, eluting hydrocarbons released oxygen from the discharge region resulting in interfering signals on the oxygen channel. These interfering signals were efficiently reduced by using a methane‐doped (0. 15%) low power RF plasma (15 W) sustained in a high make‐up flow (150 mL/min). With this plasma, a 10³:1 oxygen‐to‐carbon selectivity and a 100 pg oxygen/s detection limit were obtained. The detector was linear over three orders of magnitude. The detection system has been used to screen for oxygenated compounds in two environmental samples.

Original language	English
Journal	Journal of High Resolution Chromatography
Volume	15
Issue number	10
Pages (from-to)	677-681
Number of pages	5
ISSN	0935-6304
DOIs	https://doi.org/10.1002/jhrc.1240151009
Publication status	Published - Oct 1992

Keywords

Atomic emission spectroscopy
Capillary GC
Oxygen‐selective detection
Radio frequency plasma

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10.1002/jhrc.1240151009

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T1 - Evaluation of a radio frequency plasma for oxygen‐selective detection in capillary gas chromatography

AU - Pedersen‐Bjergaard, Stig

AU - Greibrokk, Tyge

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N2 - A radio frequency plasma detector for capillary GC has been modified for oxygen‐selective detection. Purification of the plasma gas and purging of both ends of the discharge region with helium were crucial to minimizing oxygen background emission from impurities in the plasma. With a pure helium plasma, eluting hydrocarbons released oxygen from the discharge region resulting in interfering signals on the oxygen channel. These interfering signals were efficiently reduced by using a methane‐doped (0. 15%) low power RF plasma (15 W) sustained in a high make‐up flow (150 mL/min). With this plasma, a 103:1 oxygen‐to‐carbon selectivity and a 100 pg oxygen/s detection limit were obtained. The detector was linear over three orders of magnitude. The detection system has been used to screen for oxygenated compounds in two environmental samples.

AB - A radio frequency plasma detector for capillary GC has been modified for oxygen‐selective detection. Purification of the plasma gas and purging of both ends of the discharge region with helium were crucial to minimizing oxygen background emission from impurities in the plasma. With a pure helium plasma, eluting hydrocarbons released oxygen from the discharge region resulting in interfering signals on the oxygen channel. These interfering signals were efficiently reduced by using a methane‐doped (0. 15%) low power RF plasma (15 W) sustained in a high make‐up flow (150 mL/min). With this plasma, a 103:1 oxygen‐to‐carbon selectivity and a 100 pg oxygen/s detection limit were obtained. The detector was linear over three orders of magnitude. The detection system has been used to screen for oxygenated compounds in two environmental samples.

KW - Atomic emission spectroscopy

KW - Capillary GC

KW - Oxygen‐selective detection

KW - Radio frequency plasma

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Evaluation of a radio frequency plasma for oxygen‐selective detection in capillary gas chromatography

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