Interfacial Fenton Chemistry on Aqueous Organic Aerosols

本研究的重点是研究气相物质如何在对流层气溶胶中转化和处理。提出的实验代表了一种创新的方法来理解在空气-水界面存在过渡金属离子的情况下，反应气体和有机物之间化学相互作用的本质。预计这些结果将提供关于对流层气溶胶的形成和演变的新信息，特别是那些已知对健康有不利影响的气溶胶。这项工作包括在对流层相关的实验条件下，系统研究在选定的基质的水和水/水溶性有机溶液表面发生的气液反应，暴露于环境空气中的主要气态O3、H2O2和NO2氧化剂。中心目标是绘制芬顿化学程度对以下因素的依赖性：(1)pH值；(2)单独或合成混合物中典型有机底物的性质；(3)二级有机气溶胶中具有代表性的配体的存在，以及隔离配体；(4)Cu离子的存在。该项目将提供新的数据，以改进大气中有机物质的界面反应模型。

This research is focused on the study of how gas-phase species are converted to and processed in tropospheric aerosols. The proposed experiments represent an innovative approach to understanding the nature of the chemical interactions between reactive gases and organic matter in the presence of transition metal ions at air-aqueous interfaces. The results are expected to provide new information on the formation and evolution of tropospheric aerosols, especially those that are known to have adverse health impacts.This effort includes a systematic study of gas-liquid reactions taking place on the surface of aqueous and aqueous/water soluble organic solutions of selected substrates, exposed to the major gaseous O3, H2O2 and NO2 oxidants in ambient air under experimental conditions relevant to the troposphere. The central aim is to map the dependence of the extent of Fenton chemistry on: (1) pH, (2) the nature of typical organic substrates, either alone or in synthetic mixtures, (3) the presence of ligands representative of those found in secondary organic aerosol, as well as sequestering ligands, and (4) the presence of Cu ions. The project will provide new data to improve models of interfacial reactions on organic material in the atmosphere.