| Author: | Li, Wenqi |
| Title: | Formation of OVOCs and alkyl nitrates from the dark reaction of isoprene with nitrates (NO₃) |
| Advisors: | Lee, Shuncheng (CEE) |
| Degree: | M.Sc. |
| Year: | 2020 |
| Subject: | Atmospheric chemistry Organic compounds Air -- Pollution Hong Kong Polytechnic University -- Dissertations |
| Department: | Department of Civil and Environmental Engineering |
| Pages: | viii, 51 pages : color illustrations |
| Language: | English |
| Abstract: | Alkyl nitrates (RONO₂), important reservoirs of atmospheric nitrogen, have been concerned by many scholars after proved to have effects on aerosols and ozone in the atmosphere. Isoprene (2-methyl-1,3-butadiene), the most naturally emitted non-methane volatile organic compound (NMVOC), can react with NO₃ and produce alkyl nitrates. Because isoprene has a large presence in the atmosphere, alkyl nitrate generated from this approach cannot be ignored and is worth studying. Alkyl nitrates and gas-phase products formation from the reaction of isoprene with NO₂ and O₃ is investigated in the 6 m³ Teflon reaction chamber at The Hong Kong Polytechnic University. Experiment are carried out in dark and dry (30-40% relative humidity) conditions. NO₂ and O₃ is used as a source of NO₃ radicals. A detailed literature review of most kind of widely used measuring instruments is presented in this paper. After comparing applicability and limitation, proton-transfer-reaction time-of-flight mass spectrometer (PTR-TOF-MS) is appropriate for real-time detect alkyl nitrates. So, PTR-TOF-MS and chemical ionization mass spectrometry (CIMS) are used to detected alkyl nitrates and oxygenated volatile organic compounds (OVOCs) in this study. And the result shows that nitrogen oxides have a significant effect on the alkyl nitrates. |
| Rights: | All rights reserved |
| Access: | restricted access |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| 5364.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 777.92 kB | Adobe PDF | View/Open |
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