Heterogeneous and Photochemical Transformations on Aerosol Surfaces: Understanding the Link between Hydrogen Peroxide and Carbonates Using Carbon and Oxygen Triple Isotopes
气溶胶表面的异质和光化学转化:利用碳和氧三重同位素了解过氧化氢和碳酸盐之间的联系
基本信息
- 批准号:1259305
- 负责人:
- 金额:$ 43.73万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2013
- 资助国家:美国
- 起止时间:2013-09-01 至 2017-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This project incorporates a novel approach for measuring in-situ formation of peroxide and carbonates using carbon and oxygen triple isotopes to help elucidate heterogeneous chemical transformations on aerosol surfaces. The ozone molecule is unique isotopically as it possesses the highest enrichment (70-120%) in the heavier isotopes of oxygen and serves as a natural tracer of chemical reactions involving ozone interaction. Since hydrogen peroxide is formed on aerosol surfaces, O-triple isotopic measurements of the newly formed peroxide on aerosol surfaces in the laboratory with ozone, water, and CaO indicate that the transfer of anomaly from ozone to carbonates proceeds via peroxide. This project employs both night and daytime aerosol sampling (12h sampling) of ambient air in La Jolla CA to look for day/night differences in 13C and oxygen triple isotopic composition (17O and 18O) of atmospheric carbonates and hydrogen peroxide in coarse and fine fractions of aerosols. The isotopic analyses in this project will help elucidate the molecular-level details of the mechanisms of heterogeneous reactions at aerosol surfaces.This effort will enhance our understanding of the radiative properties of aerosols, the role of oxygen isotopes in ice core data, impacts of aerosol transport to ecosystems, and health impacts of aerosols. The results will address the issue of thin films on aerosol surfaces while at the same time make progress in areas of importance to fundamental physical chemistry.
该项目采用了一种新的方法来测量过氧化氢和碳酸盐的原位形成,使用碳和氧三重同位素来帮助阐明气溶胶表面的非均质化学转化。臭氧分子在同位素上是独特的,因为它在氧的较重同位素中具有最高的富集(70-120%),并且作为涉及臭氧相互作用的化学反应的天然示踪剂。由于过氧化氢是在气溶胶表面形成的,在实验室中,臭氧、水和CaO对气溶胶表面新形成的过氧化氢的o -三重同位素测量表明,臭氧向碳酸盐的异常转移是通过过氧化氢进行的。本项目对La Jolla CA的环境空气进行了夜间和日间气溶胶采样(12h采样),以寻找大气中粗粒和细粒气溶胶中碳酸盐和过氧化氢的13C和氧三同位素组成(17O和18O)的昼夜差异。本项目中的同位素分析将有助于阐明气溶胶表面非均相反应机理的分子水平细节。这项工作将增强我们对气溶胶辐射特性、氧同位素在冰芯数据中的作用、气溶胶运输对生态系统的影响以及气溶胶对健康的影响的理解。研究结果将解决气溶胶表面薄膜的问题,同时在基础物理化学的重要领域取得进展。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Mark Thiemens其他文献
Mark Thiemens的其他文献
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{{ truncateString('Mark Thiemens', 18)}}的其他基金
Collaborative Research: EAGER--Novel Sampling and Isotopic Characterization of Upper Strato- to Mesospheric Photochemistry
合作研究:EAGER——上平层至中层光化学的新型采样和同位素表征
- 批准号:
2204474 - 财政年份:2022
- 资助金额:
$ 43.73万 - 项目类别:
Standard Grant
NSF-BSF: A Coordinated Study of the Isotope effect in the Vacuum Ultraviolet Photodissociation of Astronomically Important Molecules: Implications for the Early Solar System
NSF-BSF:天文重要分子真空紫外光解离中同位素效应的协调研究:对早期太阳系的影响
- 批准号:
2009959 - 财政年份:2020
- 资助金额:
$ 43.73万 - 项目类别:
Standard Grant
Understanding Atmospheric Sulfur Cycle using Triple Isotopes of Oxygen and Sulfur (ASCTIOS)
使用氧和硫三重同位素了解大气硫循环 (ASCTIOS)
- 批准号:
0960594 - 财政年份:2010
- 资助金额:
$ 43.73万 - 项目类别:
Standard Grant
ETBC: Collaborative Research: "The Effect of Climate on the Terrestial Sulfur Cycle"
ETBC:合作研究:“气候对陆地硫循环的影响”
- 批准号:
0819977 - 财政年份:2008
- 资助金额:
$ 43.73万 - 项目类别:
Standard Grant
Collaborative Research: An Isotope MIF Study of Volcanic Events in Greenland Ice Cores
合作研究:格陵兰冰芯火山事件的同位素 MIF 研究
- 批准号:
0612422 - 财政年份:2006
- 资助金额:
$ 43.73万 - 项目类别:
Standard Grant
Scholarships for Quantitative and Interdisciplinary Science Majors
定量和跨学科科学专业奖学金
- 批准号:
0630922 - 财政年份:2006
- 资助金额:
$ 43.73万 - 项目类别:
Standard Grant
Collaborative Research: Multiple-isotope Analysis of Nitrate and Sulfate in the West Antarctic Ice Sheet Divide Ice Core
合作研究:南极西部冰盖分裂冰芯硝酸盐和硫酸盐的多同位素分析
- 批准号:
0538520 - 财政年份:2006
- 资助金额:
$ 43.73万 - 项目类别:
Continuing Grant
Complete Isotopic Analysis of Aerosol Sulfate and Nitrate in Long-Term Samplings from the Tropical Atlantic
热带大西洋长期采样中气溶胶硫酸盐和硝酸盐的完整同位素分析
- 批准号:
0431483 - 财政年份:2004
- 资助金额:
$ 43.73万 - 项目类别:
Continuing Grant
Collaborative Research: Investigation Atomospheric Chemisty and Dynamics Through Oxygen and Sulfur Isotopes in Volcanic Sulfate from South Pole Ice Cores
合作研究:通过南极冰芯火山硫酸盐中的氧和硫同位素研究大气化学和动力学
- 批准号:
0338363 - 财政年份:2004
- 资助金额:
$ 43.73万 - 项目类别:
Standard Grant
U.S.-France Dissertation Enhancement: Variations in Dissociation Energies and Rates for Multiple NO2
美法论文增强:多种 NO2 解离能和速率的变化
- 批准号:
0129286 - 财政年份:2002
- 资助金额:
$ 43.73万 - 项目类别:
Standard Grant
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