| 项目编号: | 1405610
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| 项目名称: | Investigations of the Photochemical HONO Formation Reactions of Atmospheric Importance |
| 作者: | Lei Zhu
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| 承担单位: | Health Research Incorporated/New York State Department of Health
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| 批准年: | 2013
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| 开始日期: | 2014-08-01
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| 结束日期: | 2018-07-31
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| 资助金额: | USD709932
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Atmospheric and Geospace Sciences
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| 英文关键词: | nitrous acid
; hono
; dark reaction
; photochemical hono
; atmospheric pollutant oxidation
; hono yield
; gas phase photolysis reaction
; nitrophenol
; relative importance
; wavelength-dependent hono yield
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| 英文摘要: | This research is focused on determining the sources of nitrous acid to the atmosphere. Nitrous acid can form hydroxyl radical, an important compound responsible for creating the air pollutant ozone. Nitrous acid can be produced on some environmental surfaces, in the presence of water and nitrogen dioxide. Quantifying the relative importance of the sources of nitrous acid to the atmosphere will improve the understanding of some of the causes of air pollution and climate change.
The objective of this research is to characterize and quantify photochemical sources of nitrous acid (HONO), an important precursor to the hydroxyl radical (OH). The photolysis of HONO significantly influences atmospheric pollutant oxidation and ozone production. Recent laboratory studies have shown that nitrophenols formed from the dark reaction of nitrogen dioxide (NO2) with surface adsorbed polyphenolic compounds and the subsequent photolysis of surface-adsorbed nitrophenols may be a substantial source of HONO. But wavelength-dependent HONO yields, from the photolysis of the adsorbed nitrophenols, have not been characterized. This work will quantify photochemical HONO and the OH quantum yields from heterogeneous and gas phase photolysis reactions using laser photolysis combined with cavity ring-down spectroscopy and determine the UV/visible absorption cross sections of surface-adsorbed NO3 and nitrophenols as a function of wavelength using Brewster angle cavity ringdown spectroscopy. Additional experiments will provide data on the absorption cross sections of gas phase nitrophenols and HONO yields from nitrate and 2-nitrophenol adsorbed on surfaces that serve as surrogates for various environmentally relevant surfaces. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/96243
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Lei Zhu. Investigations of the Photochemical HONO Formation Reactions of Atmospheric Importance. 2013-01-01.
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