Collaborative Research: Aerosol Formation from Agricultural Volatile Organic Compounds

合作研究：农业挥发性有机化合物形成气溶胶

• 批准号: 1460402
• 负责人: Kathleen Purvis-Roberts
• 金额: $ 14.25万
• 依托单位: Claremont McKenna College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1460402&HistoricalAwards=false
• 关键词: Collaborative; Research; Aerosol; Formation; Agricultural

This project is investigating the potential for agricultural emissions of nitrogen and sulfur gases from sources such as dairy farms, piggeries, and other animal production sources to lead to the formation of very small particles in the atmosphere. Previous studies have shown that gas phase compounds related to waste management practices from animal agriculture could influence the formation of atmospheric particles. This project includes laboratory, field and modeling studies to investigate the environmental fate of nitrogen and sulfur compounds from these sources. An environmental chamber will be used to quantify secondary aerosol formation potentials at different relative humidities and temperatures for select amines (diethylamine (DEA), trimethylamine (TMA), butylamine (BA), a diamine, or NH3) oxidized in the presence of an organosulfur compound (methanethiol, dimethylsulfide (DMS), or dimethyldisulfide (DMDS)) or hydrogen sulfide. The investigators will perform field sampling of particulate matter and precursors at agricultural operations in Kentucky at the USDA-Agricultural Research Station (ARS) laboratory to determine the impact of elevated amine and sulfur concentrations on atmospheric chemistry.Kinetic modeling calculations will help clarify the sequence of chemical reactions responsible for the data seen in laboratory experiments. This will, in turn, help explain emission rates observed in field observations. The investigators expect to elucidate the atmospheric oxidation routes for reduced sulfur compounds and amines. Empirical estimates of the aerosol formation potential of key agricultural emissions will be developed for use in predicting local and regional air quality impacts and emissions inventories of the reduced nitrogen and sulfur species will be developed as an additional input to air quality models.

该项目正在调查农业排放的氮和硫气体的可能性，这些气体来自奶牛场、养猪场和其他动物生产来源，从而导致大气中形成非常小的颗粒。以前的研究表明，与畜牧业废物管理实践相关的气相化合物可能会影响大气颗粒物的形成。该项目包括实验室、现场和模型研究，以调查来自这些来源的氮和硫化合物的环境命运。将使用环境室来量化在不同相对湿度和温度下选择的胺(二乙胺(DEA)、三甲胺(TMA)、丁胺(BA)、二胺或NH3)在有机硫化合物(甲硫醇、二甲硫醚(DMS)或二甲基二硫化物(DMDS))或硫化氢存在下氧化的二次气溶胶形成潜力。调查人员将在美国农业部农业研究站(ARS)实验室对肯塔基州农业作业的颗粒物和前体进行现场采样，以确定胺和硫浓度升高对大气化学的影响。动力学模拟计算将有助于澄清实验室实验数据的化学反应顺序。这反过来将有助于解释在野外观测中观察到的排放率。调查人员希望阐明还原硫化物和胺的大气氧化途径。将制定对主要农业排放的气溶胶形成潜力的经验估计，用于预测当地和区域空气质量影响，并将编制减少的氮和硫物种的排放清单，作为空气质量模型的额外输入。