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Unsaturated dicarbonyl products from the OH-initiated photo-oxidation of furan, 2-methylfuran and 3-methylfuran
AbstractThis study presents the application of O-(2,3,4,5,6)-pentafluorobenzyl-hydroxylamine hydrochloride (PFBHA) on-fibre derivatisation Solid Phase Microextraction (SPME) to the sampling and quantification of the unsaturated 1,4-dicarbonyl products obtained in the photo-oxidation of furan, 2-methylfuran and 3-methylfuran with HONO: butenedial, 4-oxo-2-pentenal and 2-methylbutenedial, respectively. The use of Proton Transfer Reaction Mass Spectrometry (PTR-MS) is also considered and the advantages of the combined use of both methodologies is discussed. The 1,4 unsaturated dicarbonyl products sampled by SPME were quantified by GC-FID.The experiments were carried out in the EUPHORE outdoor simulation chambers. The results confirm that 1,4-dicarbonyls are the main products of the OH-initiated oxidation of furan and its methylated derivatives, a fact with environmental implications. Molar yields of (1.09±0.41) and (0.90±0.36) were obtained in two experiments of furan photo-oxidation. The yields of 4-oxo-2-pentenal and methylbutenedial were estimated to be (0.60±0.24) and (0.83±0.33) respectively, assuming the same SPME response factor as for butenedial. Furthermore, the unsaturated 1,4-dicarbonyls have also been identified in the chemical characterisation of the aerosols formed in the reactions. The yield of aerosols quantified were (8.5±0.8)% in the photo-oxidation of furan, (1.85±0.18)% in the photo-oxidation of 2-methylfuran and (5.5±0.5)% in the photo-oxidation of 3-methylfuran, at the following concentrations of their precursors: 829±249ppbV and 748±224 (in two furan experiments), 633±190 in the 2-methylfuran and 641±192ppbV in the 3-methylfuran experiment.
Unsaturated dicarbonyl products from the OH-initiated photo-oxidation of furan, 2-methylfuran and 3-methylfuran
AbstractThis study presents the application of O-(2,3,4,5,6)-pentafluorobenzyl-hydroxylamine hydrochloride (PFBHA) on-fibre derivatisation Solid Phase Microextraction (SPME) to the sampling and quantification of the unsaturated 1,4-dicarbonyl products obtained in the photo-oxidation of furan, 2-methylfuran and 3-methylfuran with HONO: butenedial, 4-oxo-2-pentenal and 2-methylbutenedial, respectively. The use of Proton Transfer Reaction Mass Spectrometry (PTR-MS) is also considered and the advantages of the combined use of both methodologies is discussed. The 1,4 unsaturated dicarbonyl products sampled by SPME were quantified by GC-FID.The experiments were carried out in the EUPHORE outdoor simulation chambers. The results confirm that 1,4-dicarbonyls are the main products of the OH-initiated oxidation of furan and its methylated derivatives, a fact with environmental implications. Molar yields of (1.09±0.41) and (0.90±0.36) were obtained in two experiments of furan photo-oxidation. The yields of 4-oxo-2-pentenal and methylbutenedial were estimated to be (0.60±0.24) and (0.83±0.33) respectively, assuming the same SPME response factor as for butenedial. Furthermore, the unsaturated 1,4-dicarbonyls have also been identified in the chemical characterisation of the aerosols formed in the reactions. The yield of aerosols quantified were (8.5±0.8)% in the photo-oxidation of furan, (1.85±0.18)% in the photo-oxidation of 2-methylfuran and (5.5±0.5)% in the photo-oxidation of 3-methylfuran, at the following concentrations of their precursors: 829±249ppbV and 748±224 (in two furan experiments), 633±190 in the 2-methylfuran and 641±192ppbV in the 3-methylfuran experiment.
Unsaturated dicarbonyl products from the OH-initiated photo-oxidation of furan, 2-methylfuran and 3-methylfuran
Gómez Alvarez, E. (author) / Borrás, E. (author) / Viidanoja, J. (author) / Hjorth, J. (author)
Atmospheric Environment ; 43 ; 1603-1612
2008-12-01
10 pages
Article (Journal)
Electronic Resource
English
Synthesis of (5S)-5-methylfuran-2(5H)-one and its dihydro derivative
| British Library Online Contents | 2008