Comparative Response Characterization of a Universal Acoustic Flame Detector for Chromatography

Autor: Andrea F. Scott, Kevin B. Thurbide
Rok vydání: 2014
Předmět:
Zdroj: Chromatographia. 77:865-872
ISSN: 1612-1112
0009-5893
Popis: The relative response towards a wide variety of hydrocarbons was measured simultaneously in both the acoustic flame detector (AFD) and the flame ionization detector (FID). The compounds examined included alkanes, aromatics, unsaturates, aldehydes, ketones, alcohols, carboxylic acids, and a number of hetero-atomic organic analytes. A very close linear correlation was found between AFD and FID response for these analytes with regression providing an r 2 coefficient of 0.9103. The observed universal AFD response towards hydrocarbons was attributed to a reduction in flame burning velocity through the capture of key propagating species such as hydrogen radicals. While a few minor exceptions to this correlation were observed, the most notable differences occurred for organometallic compounds, which responded 2–3 orders of magnitude more strongly in the AFD than anticipated by their FID response alone. It was found that the metals present in such analytes are directly responsible for generating the greatly increased AFD response observed, which is attributed to their known radical scavenger properties. Results indicate that overall the AFD provides a uniform response towards most hydrocarbons that is qualitatively very similar to that of an FID. For those analytes containing metals or other moieties that may be capable of significantly altering flame burning velocity, an enhanced AFD response is to be anticipated.
Databáze: OpenAIRE
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