Kinetics of dimethyl sulfide (DMS) reactions with isoprene-derived Criegee intermediates studied with direct UV absorption

doi:10.5194/acp-2020-326

GSTDTAP > 地球科学

DOI	10.5194/acp-2020-326
	Kinetics of dimethyl sulfide (DMS) reactions with isoprene-derived Criegee intermediates studied with direct UV absorption
	Mei-Tsan Kuo, Isabelle Weber, Christa Fittschen, and Jim Jr-Min Lin
	2020-04-23
发表期刊	Atmospheric Chemistry and Physics
出版年	2020
英文摘要	Criegee intermediates (CIs) are formed in the ozonolysis of unsaturated hydrocarbons and play a role in atmospheric chemistry as a non-photolytic OH source or a strong oxidant. Using a relative rate method in an ozonolysis experiment, Newland et al. [Atmos. Chem. Phys., 15, 9521–9536, 2015] reported high reactivity of isoprene-derived Criegee intermediates towards dimethyl sulfide (DMS) relative to that towards SO₂ with the ratio of the rate coefficients k_DMS+CI / k_SO₂+CI = 3.5 ± 1.8. Here we reinvestigated the kinetics of DMS reactions with two major Criegee intermediates formed in isoprene ozonolysis, CH₂OO and methyl vinyl ketone oxide (MVKO). The individual CI was prepared following reported photolytic method with suitable (diiodo) precursors in the presence of O₂. The concentration of CH₂OO or MVKO was monitored directly in real time through their intense UV-visible absorption. Our results indicate the reactions of DMS with CH₂OO and MVKO are both very slow; the upper limits of the rate coefficients are 4 orders of magnitude smaller than that reported by Newland et al. These results suggest that the ozonolysis experiment could be complicated such that interpretation should be careful and these CIs would not oxidize atmospheric DMS at any substantial level.
领域	地球科学
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/248937
专题	地球科学
推荐引用方式 GB/T 7714	Mei-Tsan Kuo, Isabelle Weber, Christa Fittschen, and Jim Jr-Min Lin. Kinetics of dimethyl sulfide (DMS) reactions with isoprene-derived Criegee intermediates studied with direct UV absorption[J]. Atmospheric Chemistry and Physics,2020.
APA	Mei-Tsan Kuo, Isabelle Weber, Christa Fittschen, and Jim Jr-Min Lin.(2020).Kinetics of dimethyl sulfide (DMS) reactions with isoprene-derived Criegee intermediates studied with direct UV absorption.Atmospheric Chemistry and Physics.
MLA	Mei-Tsan Kuo, Isabelle Weber, Christa Fittschen, and Jim Jr-Min Lin."Kinetics of dimethyl sulfide (DMS) reactions with isoprene-derived Criegee intermediates studied with direct UV absorption".Atmospheric Chemistry and Physics (2020).