Re-evaluation of the reaction rate coefficient of CH3Br + OH with implications for the atmospheric budget of methyl bromide

Elna Heimdal Nilsson; L. M. T. Joelsson; J. Heimdal; M. S. Johnson; O. J. Nielsen

doi:10.1016/j.atmosenv.2013.07.046

Re-evaluation of the reaction rate coefficient of CH3Br + OH with implications for the atmospheric budget of methyl bromide

Elna Heimdal Nilsson, L. M. T. Joelsson, J. Heimdal, M. S. Johnson, O. J. Nielsen

Combustion Physics

Research output: Contribution to journal › Article › peer-review

Abstract

The reaction rate coefficient k(CH3Br + OH) has been determined in the temperature range 298-373 K, using pulse radiolysis/UV kinetic spectroscopy, and at 298 K using a relative rate method. The Arrhenius expression obtained from a fit to the experimental results is (2.9 +/- 0.9) x 10(-12) exp(-(1230 +/- 125)/T) cm(3) molecule(-1) s(-1), which is greater than the expression currently recommended. The relative rate experiments give k(298 K) = (4.13 +/- 0.63) x 10(-14) cm(3) molecule(-1) s(-1). The results of the absolute and relative rate experiments indicate that the source budget of atmospheric CH3Br should be reinvestigated, as was recently done for CH3Cl. (C) 2013 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	70-74
Journal	Atmospheric Environment
Volume	80
DOIs	https://doi.org/10.1016/j.atmosenv.2013.07.046
Publication status	Published - 2013

Subject classification (UKÄ)

Meteorology and Atmospheric Sciences

Free keywords

Methyl bromide
Atmospheric chemistry
Reaction kinetics

Access to Document

10.1016/j.atmosenv.2013.07.046

Cite this

@article{0fe84c1557b0446f8f9e184a7e9eb4e8,

title = "Re-evaluation of the reaction rate coefficient of CH3Br + OH with implications for the atmospheric budget of methyl bromide",

abstract = "The reaction rate coefficient k(CH3Br + OH) has been determined in the temperature range 298-373 K, using pulse radiolysis/UV kinetic spectroscopy, and at 298 K using a relative rate method. The Arrhenius expression obtained from a fit to the experimental results is (2.9 +/- 0.9) x 10(-12) exp(-(1230 +/- 125)/T) cm(3) molecule(-1) s(-1), which is greater than the expression currently recommended. The relative rate experiments give k(298 K) = (4.13 +/- 0.63) x 10(-14) cm(3) molecule(-1) s(-1). The results of the absolute and relative rate experiments indicate that the source budget of atmospheric CH3Br should be reinvestigated, as was recently done for CH3Cl. (C) 2013 Elsevier Ltd. All rights reserved.",

keywords = "Methyl bromide, Atmospheric chemistry, Reaction kinetics",

author = "{Heimdal Nilsson}, Elna and Joelsson, {L. M. T.} and J. Heimdal and Johnson, {M. S.} and Nielsen, {O. J.}",

year = "2013",

doi = "10.1016/j.atmosenv.2013.07.046",

language = "English",

volume = "80",

pages = "70--74",

journal = "Atmospheric Environment",

issn = "1352-2310",

publisher = "Elsevier",

}

TY - JOUR

T1 - Re-evaluation of the reaction rate coefficient of CH3Br + OH with implications for the atmospheric budget of methyl bromide

AU - Heimdal Nilsson, Elna

AU - Joelsson, L. M. T.

AU - Heimdal, J.

AU - Johnson, M. S.

AU - Nielsen, O. J.

PY - 2013

Y1 - 2013

N2 - The reaction rate coefficient k(CH3Br + OH) has been determined in the temperature range 298-373 K, using pulse radiolysis/UV kinetic spectroscopy, and at 298 K using a relative rate method. The Arrhenius expression obtained from a fit to the experimental results is (2.9 +/- 0.9) x 10(-12) exp(-(1230 +/- 125)/T) cm(3) molecule(-1) s(-1), which is greater than the expression currently recommended. The relative rate experiments give k(298 K) = (4.13 +/- 0.63) x 10(-14) cm(3) molecule(-1) s(-1). The results of the absolute and relative rate experiments indicate that the source budget of atmospheric CH3Br should be reinvestigated, as was recently done for CH3Cl. (C) 2013 Elsevier Ltd. All rights reserved.

AB - The reaction rate coefficient k(CH3Br + OH) has been determined in the temperature range 298-373 K, using pulse radiolysis/UV kinetic spectroscopy, and at 298 K using a relative rate method. The Arrhenius expression obtained from a fit to the experimental results is (2.9 +/- 0.9) x 10(-12) exp(-(1230 +/- 125)/T) cm(3) molecule(-1) s(-1), which is greater than the expression currently recommended. The relative rate experiments give k(298 K) = (4.13 +/- 0.63) x 10(-14) cm(3) molecule(-1) s(-1). The results of the absolute and relative rate experiments indicate that the source budget of atmospheric CH3Br should be reinvestigated, as was recently done for CH3Cl. (C) 2013 Elsevier Ltd. All rights reserved.

KW - Methyl bromide

KW - Atmospheric chemistry

KW - Reaction kinetics

U2 - 10.1016/j.atmosenv.2013.07.046

DO - 10.1016/j.atmosenv.2013.07.046

M3 - Article

SN - 1352-2310

VL - 80

SP - 70

EP - 74

JO - Atmospheric Environment

JF - Atmospheric Environment

ER -

Re-evaluation of the reaction rate coefficient of CH3Br + OH with implications for the atmospheric budget of methyl bromide

Abstract

Subject classification (UKÄ)

Free keywords

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