Carbon kinetic isotope effects in the gas-phase reactions of aromatic hydrocarbons with the OH radical at 296 ± 4 K -: art. no. L15108
Carbon kinetic isotope effects in the gas-phase reactions of aromatic hydrocarbons with the OH radical at 296 ± 4 K -: art. no. L15108
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DOI：
10.1029/2004gl020089
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发表时间：
2004-08-11
影响因子：
5.2
通讯作者：
Huang, L
中科院分区：
文献类型：
--
作者：
Anderson, RS;Iannone, R;Huang, L
采用气相色谱-在线燃烧-同位素比质谱联用技术（GCC-IRMS），在常压反应室中研究了苯和几种轻烷基苯与OH自由基反应的碳动力学同位素效应（KIE）。KIE以每密耳为单位报告，根据KIE（千分之一）=（KIE-1）× 1000，其中KIE=k（12）/k（13）。获得以下平均KIE（均以千分之一计）：苯7.53+/-0.50;甲苯5.95+/-0.28;甲苯4.34+/-0.28;邻二甲苯4.27+/-0.05，对二甲苯4.83+/-0.81;邻乙基甲苯4.71+/-0.12和1，2，4-三甲基苯3.18+/-0.09。我们对苯+ OH的KIE值与我们已知的唯一报道值一致[Rudolph等人，2000年]。结果表明，轻芳烃化合物的稳定碳同位素比值的测量应是非常有用的研究大气处理的OH自由基。
The carbon kinetic isotope effects (KIEs) of the room temperature reactions of benzene and several light alkyl benzenes with OH radicals were studied in a reaction chamber at ambient pressure using gas chromatography coupled with online combustion and isotope ratio mass spectrometry (GCC-IRMS). The KIEs are reported in per mil according to epsilon (parts per thousand)=(KIE-1) x 1000, where KIE=k(12)/k(13). The following average KIEs were obtained, (all in parts per thousand): benzene 7.53+/-0.50; toluene 5.95+/-0.28; ethylbenzene 4.34+/-0.28; o-xylene 4.27+/-0.05, p-xylene 4.83+/-0.81; o-ethyltoluene 4.71+/-0.12 and 1,2,4-trimethylbenzene 3.18+/-0.09. Our KIE value for benzene + OH agrees with the only reported value known to us [Rudolph et al., 2000]. It is shown that measurements of the stable carbon isotope ratios of light aromatic compounds should be extremely useful to study atmospheric processing by the OH radical.