DIFFERENT CONCENTRATIONS OF GLYOXAL AND AMMONIUM

该子项目是利用资源的许多研究子项目之一 由NIH/NCRR资助的中心赠款提供。子项目的主要支持 而子项目的主要调查员可能是由其他来源提供的， 包括其它NIH来源。 列出的子项目总成本可能 代表子项目使用的中心基础设施的估计数量， NCRR赠款不直接向子项目或子项目工作人员提供资金。 乙二醛是最小的α-二羰基，在许多碳氢化合物的大气氧化中形成。它越来越引起大气科学家的兴趣，因为它分解成大气气溶胶的速度比其蒸汽压所显示的要快得多。最近的研究表明，乙二醛与硫酸铵气溶胶中的氨反应，不可逆地形成取代的咪唑化合物。虽然这种反应对化学家来说并不新鲜，但这是第一次在大气化学中的气溶胶中发现咪唑。本研究将使用紫外-可见光谱和NMR来探测散装溶液中硫酸铵和乙二醛之间的反应动力学，以了解气溶胶内发生的反应。NMR对于这项工作至关重要，因此我们可以明确地识别和确定溶液中产物的产率，因为紫外可见光谱只能给我们一个速率的概念，而不是单个产物的形成。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. Glyoxal, the smallest alpha-dicarbonyl, is formed in the atmospheric oxidation of many hydrocarbons. It is becoming increasingly interesting to atmospheric scientists due to the fact that it partitions into atmospheric aerosol much more quickly than its vapor pressure would suggest. Recent studies have shown that glyoxal reacts with the ammonia in ammonium sulfate aerosol to irreversibly form substituted imidazole compounds. While this reaction is not new to chemists, this is the first time imidazoles have been identified within the aerosol in the atmospheric chemistry. This study will use uv-visible spectroscopy and NMR to probe the kinetics of the reaction between ammonium sulfate and glyoxal in bulk solution in order to understand the reactions occurring within the aerosol. NMR is vital to this effort so we can unequivocably identify and determine yields of the products in solution, as uv-visible spectroscopy will only give us an idea of rates, but not individual product formation.