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Pressure and gas composition effects on the operation of the pulsed flame photometric detector
Author(s) -
Frishman Gad,
Amirav Aviv,
Barak Haim
Publication year - 2001
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1560/r5t2-v8hm-wyjj-41tv
Subject(s) - bar (unit) , chemistry , analytical chemistry (journal) , nitrogen , emission intensity , sulfur , detector , sensitivity (control systems) , total pressure , hydrogen , atmospheric pressure , gas composition , optics , chromatography , thermodynamics , ion , organic chemistry , physics , oceanography , electronic engineering , geology , meteorology , engineering
The effect of pressure and hydrogen/oxygen ratio of a burning gas mixture on pulsed flame emission time‐dependence was investigated in the range of 0.1–5 atm using a specially designed pulsed flame photometric detector (PFPD). We studied the pressure and gas composition effect on the pulsed flame delayed light emission of sulfur, phosphorus, and nitrogen‐containing organic compounds. The optimal pressure conditions for nitrogen detection, intensity, and emission time delay was found to be 0.4 bar, at which the detection sensitivity could be improved by a factor of 2. For phosphorus, the optimal pressure obtained was 1.3 bar with 40% sensitivity improvement (compared with 1 bar). In the case of sulfur detection, two emission maxima were obtained, at 1.1 and 0.6 bar, at H/O ratio of 5. Increasing the H/O ratio resulted in the appearance of only one peak at 1 bar, and enhancement of the sensitivity by a factor of 2.4 at H/O ratio of 10.3. From the analytical point of view, we found that emission intensity is practically unchanged by the pressure and the H/O ratio for all three elements investigated in the range of 0.8–1.1 bar and H/O of 5–6. Thus, in addition to excellent sensitivity and improved selectivity, the PFPD can be applied under a variety of atmospheric pressure conditions in field environmental applications.