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Chamber study of biogenic volatile organic compounds : plant emission, oxidation products and their OH reactivity / author: Zhujun Yu. Wuppertal, July 2018
Content
Abstract
Introduction
Volatile Organic Compounds (VOCs)
Sources of atmospheric VOCs
Sinks of atmospheric VOCs
Atmospheric oxidants
Tropospheric OH radicals formation
Tropospheric O3 formation
Tropospheric NO3 radicals formation
Total OH reactivity
Introduction to total OH reactivity
Missing kOH in the world
Focus of this thesis
Methods and Instruments
Proton Transfer Reaction-Time Of Flight-Mass Spectrometry (PTR-TOF-MS)
Ion-molecule reactions
Mass separation and ion detection
Mass spectra analysis
Quantification of VOCs concentrations
Gas-Chromatograph (GC)
Laser Flash Photolysis-Laser Induced Fluorescence (LP-LIF)
Experimental section
Chamber svaporystem
Experiments characterizing plant emission intensity and patterns
VOCs oxidation experiments
BVOCs Oxidation
AVOCs Oxidation
Data evaluation
Product yields determination
Missing OH reactivity investigation
O/C ratio calculation
Plant emitted BVOC measurements
Overall plant emissions
Light- and temperature-dependent plant emissions
Product yields from BVOCs oxidations
Single BVOCs
BVOC mixture
BVOCs from plant emission
Results and discussion of the OH reactivity
Missing OH reactivity for BVOCs oxidations
Missing OH reactivity for AVOCs oxidations
Discussion of missing OH reactivity
Summary and conclusion
Sensitivity table
kOH comparison time series
Yield plot
Bibliography
Acknowledgements