SGER: Smog Chamber Investigations into Reactions of Tertiary Amines with NOy

PI及其同事将在加州大学滨江分校进行一系列烟雾室实验，以研究小胺与活性氮（NOy）化合物的反应动力学和产物。 尽管有越来越多的证据表明，烷基胺可能是前体颗粒成分，一些实验室研究可能的化学机制已经进行，并没有看到胺与硝酸根（NO3）和五氧化二氮（N2 O 5）的相互作用。 粒子的形成速率和机制将与受控的实验室研究模拟烷基胺在大气中的反应进行调查。 这些研究将集中在胺与硝酸根和五氧化二氮的反应，以及它们的凝相（颗粒）产物。 气相胺浓度将使用质子转移反应质谱仪（PTRMS）进行监测，而气溶胶成分将使用高分辨率飞行时间气溶胶质谱仪（TOF-AMS）进行表征。 气溶胶粒度分布也将从扫描迁移率粒度仪（SMPS）获得，重量样品将使用质谱技术进行离线化学分析。对胺的气溶胶形成反应的研究将产生关于氮的全球循环的信息。 目前，在全球有机氮模型中没有考虑颗粒相胺。 这项工作将更清楚地阐明还原有机氮在大气中的归宿，并将有助于了解农业空气污染物的归宿。 其他更广泛的影响包括支持一个博士学位。学生进行烟雾室研究，这将成为他/她的论文的一部分，并支持本科生研究助理进行数据分析和颗粒的离线化学分析。

The PI and coworkers will conduct a series of smog chamber experiments at the University of California, Riverside to study the reaction kinetics and products of small amines with reactive nitrogen (NOy) compounds. Despite mounting evidence that alkyl amines may be precursors to particle constituents, few laboratory studies of the possible chemical mechanisms have been conducted, and none have looked at the interactions of amines with the nitrate radical (NO3) and dinitrogen pentoxide (N2O5). Particle formation rates and mechanisms will be investigated with controlled laboratory studies simulating alkyl amine reactions in the atmosphere. The studies will focus on amine reactions with nitrate radical and dinitrogen pentoxide, and their condensed-phase (particulate) products. Gas-phase amine concentrations will be monitored using a proton transfer reaction mass spectrometer (PTRMS) while aerosol composition will be characterized with a high resolution time-of-flight aerosol mass spectrometer (TOF-AMS). Aerosol size distributions will also be obtained from a scanning mobility particle sizer (SMPS), and gravimetric samples will be chemically analyzed off-line using mass spectrometry techniques. Studies of aerosol formation reactions from amines will yield information on the global cycle of nitrogen. Currently, particulate phase amines are not accounted for in global models of organic nitrogen. This work should more clearly elucidate the fate of reduced organic nitrogen in the atmosphere, and will be helpful for understanding the fate of agricultural air pollutants. Other broader impacts include support for one Ph.D. student to perform the smog chamber studies, which will become part of his/her dissertation, and support for undergraduate research assistants to perform data analysis and off-line chemical analysis of particles.