TY - JOUR
T1 - Mechanism of sulfur emission quenching in flame photometric detectors
AU - Kalontarov, Lev
AU - Jing, Hongwu
AU - Amirav, Aviv
AU - Cheskis, Sergey
N1 - Funding Information:
This research was partially supported by a grant from the Israel Ministry for Science and Technology, by the James Franck Germany-Israel Binational Program in Laser Matter Interaction and by a grant from the Israel National Science Fund administered by the Israel Academy of Sciences and Humanities.
PY - 1995/4/14
Y1 - 1995/4/14
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0028947584&partnerID=8YFLogxK
U2 - 10.1016/0021-9673(94)01273-H
DO - 10.1016/0021-9673(94)01273-H
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AN - SCOPUS:0028947584
VL - 696
SP - 245
EP - 256
JO - Journal of Chromatography A
JF - Journal of Chromatography A
SN - 0021-9673
IS - 2
ER -