Photochemical Aging of Polycyclic Aromatic Hydrocarbons on Asian Particulate Matter

多环芳烃对亚洲颗粒物的光化学老化

• 批准号: 0841165
• 负责人: Staci Simonich
• 金额: $ 27.86万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-02-01 至 2013-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0841165&HistoricalAwards=false
• 关键词: Photochemical; Aging; Polycyclic; Aromatic; Hydrocarbons

The primary objective of the research is to understand the effect of photochemical aging on the polycyclic aromatic hydrocarbon (PAH) composition of Asian particulate matter (PM) during trans-Pacific atmospheric transport to the U.S. West Coast. The principal investigators hypothesize that nitro-PAHs (NPAHs) and oxy-PAHs (OPAHs) are formed on Asian PM during trans-Pacific atmospheric transport. The specific goal of this research is to use aerosol reactors to study the photochemical aging of size-fractionated Asian PM in the laboratory.While incomplete combustion results in the formation of unsubstituted PAHs, both nitro-PAHs and oxy-PAHs result from both direct emission during incomplete combustion and reactions of unsubstituted PAHs with photochemical reactants (ozone, hydroxyl radical and nitrogen oxides) during the daytime and reactions with nitrate radicals at night. It is likely that PAHs react with these oxidants during trans-Pacific transport to form NPAH and OPAH. Existing aerosol samples from both Asia and Oregon, containing Asian PM, will be used for the laboratory studies of PAH aging. Chemical oxidation of PAHs on aerosol samples will be carried out and subsequently analyzed in collaboration with colleagues at the University of Bordeaux.The activity includes training a graduate student and continued inclusion of a faculty member from Central Oregon Community College (COCC) and her undergraduate students in the research. COCC undergraduate students will learn to conduct statistical manipulations of a large research data set, as well as understand the process of identifying and quantifying PAHs using mass spectrometry. Finally, the results of the research could have global environmental policy implications with regard to combustion emission controls in Asia.

本研究的主要目的是了解光化学老化对亚洲颗粒物（PM）的多环芳烃（PAH）组成的影响，在跨太平洋大气传输到美国西海岸。主要研究人员假设，硝基多环芳烃（NPAH）和氧多环芳烃（OPAH）形成的亚洲PM在跨太平洋大气传输。本研究利用气溶胶反应器在实验室中研究了不同粒径的颗粒物的光化学老化过程，不完全燃烧导致未取代多环芳烃的生成，而硝基多环芳烃和氧代多环芳烃都是不完全燃烧直接排放和未取代多环芳烃与光化学反应物反应的产物在白天与臭氧、羟基自由基和氮氧化物反应，在晚上与硝酸根反应。在跨太平洋的迁移过程中，多环芳烃很可能与这些氧化剂发生反应，生成NPAH和OPAH。来自亚洲和俄勒冈州的现有气溶胶样本（含有亚洲PM）将用于PAH老化的实验室研究。将与波尔多大学的同事合作，对气溶胶样品中的多环芳烃进行化学氧化，并随后进行分析。该活动包括培训一名研究生，并继续将一名来自中央俄勒冈州社区学院（COCC）的教师及其本科生纳入研究。COCC本科生将学习进行大型研究数据集的统计操作，以及了解使用质谱法识别和量化多环芳烃的过程。最后，研究结果可能对亚洲的燃烧排放控制产生全球环境政策影响。