The Flame lonization Detector: Further Comments on Molecular Breakdown and Fundamental Group Responses

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Abstract
Some factors affecting the concept of relative molar responses in the FID as arising from the sum of effective carbon responses of subunits formed by thermal cracking of molecules in the hydrogen flame are reviewed in the light of recent literature data. Occasional exceptional behaviour of long-chain hydrocarbon chains is discussed. 4-Methyl-4-methoxy-pentanone-2 is proposed as a low molecular weight material suitable for interlaboratory and interapparatus comparisons of FID response of exotic low molecular weight materials or biological and water-soluble materials. The present “state of the art” of volatile free fatty acid quantitation in the FID is briefly reviewed.