Career: Photochemical Oxidation of Dissolved Sulfur Dioxide and Other Sulfur (IV) Species in the Presence of Iron Organic Complexes in Atmospheric Waters

二氧化硫（SO2）的水相氧化是大气硫循环的重要组成部分。云中溶解的SO2被O2催化铁氧化被认为是硫酸盐形成的三种主要途径之一，然而，大气模型中铁催化氧化途径的参数化目前存在相当大的不确定性。这个CAREER项目是对大气液体中存在铁和有机化合物时硫iv类的光化学氧化的研究。本研究的目的是：1)确定硫- iv在真实的大气水体（如雨、雾和云水）和含有铁-有机络合物（如草酸、乙草酸和丙酮酸铁络合物）的模拟系统中的光化学氧化速率2)检查其他有机污染物（如甲醛、乙醛、甲酸和醋酸盐）和过渡金属（如Cu和Mn）对存在铁-有机络合物时溶解的二氧化硫光氧化的影响；3)研究溶解SO2对fe -有机配合物光化学循环的影响；4)评价fe -有机配合物存在下硫- iv光化学氧化对大气液相中硫酸盐整体形成的相对贡献。本项目的教育内容包括通过演示、实验室练习、实地研究和独立研究项目，将大气水生光化学整合到教学计划中。

Aqueous-phase oxidation of sulfur dioxide (SO2) is an important component of the atmospheric sulfur cycle. The Fe-catalyzed oxidation of dissolved SO2 by O2 in clouds is considered one of the three major pathways for the formation of sulfate, however parameterization of the Fe-catalyzed oxidation pathway in atmospheric models currently involves considerable uncertainty. This CAREER project is an investigation of the photochemical oxidation of sulfur-IV species in the presence of iron and organic compounds in atmospheric liquids. The objectives of this study are to: 1) determine the photochemical oxidation rates of sulfur-IV in both authentic atmospheric waters (e.g. rain, fog, and cloud waters) and modeled systems containing iron-organo complexes (e.g. oxalato-, glyoxalato-, and pyruvato iron complexes) 2) examine the influence of other organic pollutants (e.g. formaldehyde, acetaldehyde, formate and acetate) and transition metals (e.g. Cu and Mn) on the photooxidation of dissolved S02 in the presence of Fe-organo complexes; 3) examine the effects of dissolved SO2 on the photochemical cycling of Fe-organo complexes; and 4) evaluate the relative contribution of photochemical oxidation of sulfur-IV in the presence of Fe-organo complexes to the overall formation of sulfate in atmospheric liquid phases. The educational component of this project involves the integration of atmospheric aquatic photochemistry into a teaching program by using demonstrations, laboratory exercises, field studies, and independent research projects,