Response of the Flame Ionization Detector to Water and Formic Acid

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Abstract
Water and formic acid have been examined for possible responses in the hydrogen flame ionization detector (HFID). Water gives both negative and positive responses in flames which have a high background current due either to added hydrocarbon or to “emission” from a red-hot burner jet. The responses found may have a limited application in analysis, such as the detection of traces of water in certain liquids, and a mechanism for the response is suggested. Formic acid gives no response under any of the conditions used; it may, therefore, have applications as a solvent in gas chromatography with the HFID, but being hygroscopic it absorbs water and then gives a response.

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