A Laboratory Study to Investigate Inorganic and Organic Sulfate Formation in Multiphase Processes Involving Mineral Dust and Other Metal-Containing Aerosols

研究涉及矿物粉尘和其他含金属气溶胶的多相过程中无机和有机硫酸盐形成的实验室研究

基本信息

批准号：
1702488
负责人：
Vicki Grassian
金额：
$ 48.24万
依托单位：
University of California-San Diego
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-07-01 至 2021-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1702488&HistoricalAwards=false
关键词：
Laboratory Study Investigate Inorganic Organic

项目摘要

This project focuses on laboratory studies to better understand particulate sulfate formation from sulfur dioxide oxidation in the atmosphere. A major focus of the proposed studies will be to quantify rates and extent of sulfate formation in multiphase pathways involving mineral dust and other metal-containing aerosols as a function of pH, temperature and light.The mechanisms for sulfate formation that will be investigated in a series of laboratory studies that include the: (1) catalytic effects of transition metal ions present in mineral and anthropogenic metal-containing dusts; (2) enhanced sulfate formation in the presence of photoactive semiconductor oxides; and (3) role of organic compounds in mineral mediated sulfate processes. In addition, new methods to investigate the chemistry within individual cloud droplets will be developed, including an optical tweezer with cavity enhanced Raman spectroscopy to investigate sulfur oxidation chemistry within micron sized single droplets containing a dust inclusion. The experiments will be done in the presence and absence of atmospherically important organic species that can react to yield organosulfates. This project will also assess the importance of surface reactivity versus bulk reactivity, important for modeling cloud processes.

该项目侧重于实验室研究，以更好地了解大气中二氧化硫氧化形成的颗粒硫酸盐。拟议研究的一个主要重点是量化涉及矿物粉尘和其他含金属气溶胶的多相途径中硫酸盐形成的速率和程度，作为 pH、温度和光的函数。硫酸盐形成的机制将在以下方面进行研究：一系列实验室研究，包括：（1）矿物和人为含金属粉尘中存在的过渡金属离子的催化作用； (2)在光敏半导体氧化物存在下增强硫酸盐形成； (3)有机化合物在矿物介导的硫酸盐过程中的作用。此外，还将开发研究单个云滴内化学的新方法，包括具有空腔增强拉曼光谱的光镊，以研究含有灰尘夹杂物的微米级单滴内的硫氧化化学。这些实验将在存在或不存在可以反应产生有机硫酸盐的大气中重要的有机物质的情况下进行。该项目还将评估表面反应性与本体反应性的重要性，这对于云过程建模很重要。