Studies of the Organic Composition of Tropospheric Aerosols

将进行实地和实验室研究，以更好地了解颗粒相有机化合物在大气生物地球化学循环中的作用。这项研究的一个主要目标是完成作为农村氧化剂研究的一部分而收集的气溶胶样本的化学分析，并对数据进行多变量统计分析。通过进一步的实地研究，另一个目标是进一步阐明与蒸气和颗粒相有机化合物的化学有关的不同因素，这些因素已经在科罗拉多州博尔德市的一个城市地点和科罗拉多州尼沃特里奇的一个原始地点进行了测量。最后一个目标是确定对流层颗粒物中含氮和含硫的有机成分的特征，以及这些化合物与大气光解氧化循环的关系。在这些研究中，将使用低体积采样技术确定颗粒相有机成分的每小时变化，然后进行层析分离和灵敏检测。拟议的对颗粒中含氮和含硫有机成分的研究将需要开发新的分析方法，包括超临界流体萃取、化学发光技术和原子发射的选择性检测。

Field and laboratory studies will be conducted to better understand the role of particulate phase organic compounds in atmospheric biogeochemical cycles. One principal objective of the research is the completion of the chemical analysis of aerosol samples that have already been collected as part of a study on rural oxidants and to perform multi-variate statistical analysis of the data. By way of further field studies, another objective is the further elucidation of the different factors that relate to the chemistry of vapor and particle phase organic compounds that have already been measured at an urban location in Boulder, Colorado, and a pristine site at Niwot Ridge, Colorado. A final objective is the characterization of nitrogen- and sulfur- containing organic constituents of tropospheric particulate and of the relationships of such compounds to atmospheric photolytic oxidation cycles. In these studies, hourly variations in the particulate phase organic composition will be determined using a low-volume sampling technique followed by chromatographic separation and sensitive detection. Proposed studies of nitrogen- and sulfur-containting organic constituents of particles will require the development of new analytical methods involving supercritical fluid extractions and selective detection by chemiluminescene techniques and atomic emission.