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Kinetic and product studies of the hydroxyl radical initiated oxidation of dimethyl sulfide in the temperature range 250 - 300 K / submitted by Mihaela Albu. 2008
Inhalt
Chapter 1
Introduction
1.1 Importance of sulfur chemistry in the atmosphere
1.2 Sulfur compounds in the atmosphere
1.3 Atmospheric sulfur cycle
1.4 Dimethyl sulfide in the atmosphere
Chapter 2
Gas-phase chemistry of dimethyl sulfide (DMS) with hydroxyl (OH) radicals: state of knowledge
2.1 Kinetics of the reaction of OH radicals with DMS
2.2 Product and mechanistic studies of the reaction of OH radicals with DMS
2.2.1 O2-dependent channel
2.2.2 O2-independent channel
2.3 Aim of the work
Chapter 3
Experimental section
3.1 Experimental set-up
3.1.1 Description of the reaction chamber
3.1.2 Description of the sampling system for ion chromatography analysis
3.2 Typical experimental procedure
3.2.1 Kinetic experiments on the system DMS ( OH radicals
3.2.2 Product study experiments on the system DMS ( OH radicals
3.3 Generation of OH radicals
3.4 Data analysis
3.4.1 Relative rate method
3.4.2 Product analysis
Chapter 4
Kinetic study of the OH radical initiated oxidation of dimethyl sulfide
4.1 Results
4.2 Discussion
4.2.1 Possible source of errors in the system
4.2.2 Comparison with previous work
4.3 Summary of the kinetic results
Chapter 5
Product study of the OH radical initiated oxidation of dimethyl sulfide
5.1 Experimental results
5.1.1 Dimethyl sulfoxide (DMSO)
5.1.2 Dimethyl sulfone (DMSO2)
5.1.3 Sulfur dioxide (SO2)
5.1.4 Methyl sulfonyl peroxynitrate (MSPN)
5.1.5 Methyl thiol formate (MTF)
5.1.6 Carbonyl sulfide (OCS)
5.1.7. Methane sulfonic acid (MSA) and methane sulfinic acid (MSIA)
5.2 Discussion of the results and comparison with literature data
5.2.1 Dimethyl sulfoxide (DMSO) and dimethyl sulfone (DMSO2) formation
5.2.2 Sulfur dioxide (SO2), methyl thiol formate (MTF), methane sulfonic acid (MSA) and methyl sulfonyl peroxynitrate (MSPN) formation
5.2.3 Carbonyl sulfide (OCS) formation
5.2.4 Methane sulfonic acid (MSA) and methane sulfinic acid (MSIA) formation
5.3 Summary of the product results
Chapter 6
Atmospheric implications
Summary
Appendix I
Synthesis of methyl nitrite (CH3ONO)
Appendix II
Gas-phase infrared absorption cross sections
Calibration method
Appendix III
Literature product yields in the reaction of dimethyl sulfide with OH radicals.
Appendix IV
Gases and chemicals
IV.1: Gases employed in this work
IV.2: Chemicals employed in this work
Appendix V
Abbreviations
References