DIFFERENT CONCENTRATIONS OF GLYOXAL AND AMMONIUM

不同浓度的乙二醛和铵

• 批准号: 8361169
• 负责人: FRANK KEUTSCH
• 金额: $ 0.06万
• 依托单位: UNIVERSITY OF WISCONSIN-MADISON
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-03-01 至 2012-02-29
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8361169
• 关键词: Aerosols; Ammonia; Ammonium; Ammonium Sulfate; Chemistry; Funding; Glyoxal; Grant; Hydrocarbons; Imidazole; Individual; Kinetics; NMR Spectroscopy; National Center for Research Resources; Principal Investigator; Reaction; Research; Research Infrastructure; Resources; Scientist; Solutions; Source; Spectrum Analysis; Time; United States National Institutes of Health; cost; interest; oxidation; pressure; vapor

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.

这个子项目是利用资源的许多研究子项目之一。 由NIH/NCRR资助的中心拨款提供。对子项目的主要支持 子项目的首席调查员可能是由其他来源提供的， 包括美国国立卫生研究院的其他来源。为子项目列出的总成本可能 表示该子项目使用的中心基础设施的估计数量， 不是由NCRR赠款提供给次级项目或次级项目工作人员的直接资金。 乙二醛是最小的α-二羰基，在大气中许多碳氢化合物的氧化过程中形成。大气科学家对它越来越感兴趣，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，不可逆地生成取代的咪唑类化合物。虽然这一反应对化学家来说并不新鲜，但这是大气化学中首次在气溶胶中发现咪唑类化合物。本研究将利用紫外-可见光谱和核磁共振技术来探索在溶液中硫酸铵与乙二醛的反应动力学，以了解气溶胶中发生的反应。核磁共振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品的产率，因为紫外-可见光谱只能给我们一个速率的概念，而不是单个产品的形成。