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Issue 12, 2017
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Increasing flame ionization detector (FID) sensitivity using post-column oxidation–methanation

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Abstract

The flame ionization detector (FID) is a robust tool in gas chromatography (GC) due to its sensitivity and linear response in the detection of common organic compounds. However, FID response to oxygenated or highly functionalized organic molecules is low, or in some cases non-existent, making it difficult or impossible to detect and quantify some organic compounds. In this work, the combination of a GC/FID system with a catalytic microreactor, which performs post-column combustion–methanation to convert organic compounds to methane, is shown to be an effective approach for quantifying low-response organic compounds. Molecules that were previously undetectable by conventional FID, including carbon monoxide and carbon dioxide, respond with the same high response of methane in the FID. Low-response molecules, including formaldehyde, formic acid, formamide, and ten other oxygenates also demonstrated enhanced detector response equivalent to that of methane in the FID. The linear response of the FID to these molecules and the equivalent sensitivity to methane indicate that accurate quantification is possible without the usual calibration-corrections (e.g., response factors or correction factors) to the FID response.

Graphical abstract: Increasing flame ionization detector (FID) sensitivity using post-column oxidation–methanation

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Article information


Submitted
15 Dec 2016
Accepted
04 Mar 2017
First published
06 Mar 2017

Anal. Methods, 2017,9, 1928-1934
Article type
Paper

Increasing flame ionization detector (FID) sensitivity using post-column oxidation–methanation

C. S. Spanjers, C. A. Beach, A. J. Jones and P. J. Dauenhauer, Anal. Methods, 2017, 9, 1928
DOI: 10.1039/C6AY03363F

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