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Rates of the reactions of 111‐trichloroethane (methyl chloroform) and 112‐trichloroethane with OH
Author(s) -
Jeong KyuMan,
Kaufman Frederick
Publication year - 1979
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl006i010p00757
Subject(s) - chloroform , arrhenius equation , chemistry , ozone depletion , catalysis , ozone , atmospheric temperature range , troposphere , analytical chemistry (journal) , chromatography , activation energy , organic chemistry , meteorology , physics
Highly purified samples of the two chlorocarbons were reacted with OH over the temperature range 278 to 460 K in a discharge‐flow system with resonance fluorescence detection of OH. Arrhenius expressions within 95% confidence limitsnot including systematic errorsare (5.49 ± 1.40) × 10 −12 exp[−(1832 ± 98)/T] cm³ s −1 for CH 3 CCl 3 and (1.57 ± 0.20) × 10 −12 exp[−(463 ± 46)/T] cm³ s −1 for CH 2 ClCHCl 2 . The important methyl chloroform reaction is slower and its temperature dependence somewhat steeper than earlier measurements had indicatedpresumably due to the presence of faster reacting olefinic impurities in prior studies. Implications for stratospheric ozone reduction by ClO x catalysis and for the tropospheric OH‐budget are discussed briefly.