Mechanism of sulfur emission quenching in flame photometric detectors

Lev Kalontarov, Hongwu Jing, Aviv Amirav, Sergey Cheskis

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of sulfur emission quenching by CH4, CO, CO2 and octane was studied using pulsed flame photometric detection (PFPD). It was established that quenching is more efficient at the long time delayed emission. The dependence of quenching efficiency on quencher concentration was found to be similar for all of the above compounds when it was normalized to the concentration of carbon atoms. It is proposed that the dominant reaction leading to sulfur emission quenching is CO + S = COS whereas CO is probably the main product of hydrocarbon combustion in a hydrogen-rich hydrogen-air flame. The experiments and model calculation indicate that CO-induced catalytic hydrogen recombination also promotes quenching and thus quenching is a universal phenomenon in FPD. A quenching-free dynamic range is defined; it is 105 for pulsed FPD. It is shown how quenching is identified and largely reduced with pulsed FPD.

Original languageEnglish
Pages (from-to)245-256
Number of pages12
JournalJournal of Chromatography A
Volume696
Issue number2
DOIs
StatePublished - 14 Apr 1995

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