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Atmospheric Chemistry of Camphor
Author(s) -
Reissell Anni,
Arey Janet,
Atkinson Roger
Publication year - 2000
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/1097-4601(20010101)33:1<56::aid-kin7>3.0.co;2-y
Subject(s) - chemistry , radical , reaction rate constant , camphor , acetone , yield (engineering) , chemical ionization , mass spectrometry , reaction mechanism , hydroxyl radical , photochemistry , organic chemistry , ionization , ion , chromatography , kinetics , catalysis , physics , materials science , quantum mechanics , metallurgy
Rate constants have been measured at 296 ± 2 K for the gas‐phase reactions of camphor with OH radicals, NO 3 radicals, and O 3 . Using relative rate methods, the rate constants for the OH radical and NO 3 radical reactions were (4.6 ± 1.2) × 10 −12 cm 3 molecule −1 s −1 and <3 × 10 −16 cm 3 molecule −1 s −1 , respectively, where the indicated error in the OH radical reaction rate constant includes the estimated overall uncertainty in the rate constant for the reference compound. An upper limit to the rate constant for the O 3 reaction of <7 × 10 −20 cm 3 molecule −1 s −1 was also determined. The dominant tropospheric loss process for camphor is calculated to be by reaction with the OH radical. Acetone was identified and quantified as a product of the OH radical reaction by gas chromatography, with a formation yield of 0.29 ± 0.04. In situ atmospheric pressure ionization tandem mass spectrometry (API‐MS) analyses indicated the formation of additional products of molecular weight 166 (dicarbonyl), 182 (hydroxydicarbonyl), 186, 187, 213 (carbonyl‐nitrate), 229 (hydroxycarbonyl‐nitrate), and 243. A reaction mechanism leading to the formation of acetone is presented, as are pathways for the formation of several of the additional products observed by API‐MS. © 2000 John Wiley and Sons, Inc. Int J Chem Kinet 33: 56–63, 2001