权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Naturally produced organohalogens; Atmospheric simulation experiments on halogen activation in aerosol smog chamber facilities with sea salt and secondary organic aerosol (HALOSOA)

天然产生的有机卤素；

基本信息

批准号：
52753310
负责人：
Professor Dr. Cornelius Zetzsch
金额：
--
依托单位：
Abteilung Atmosphärenchemie
依托单位国家：
德国
项目类别：
Research Units
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/52753310?language=en
关键词：
Naturally produced organohalogens Atmospheric simulation

项目摘要

Zusammenfassung (deutsch)Mixing of continental and marine air masses causes an interaction of activated halogens with humic compounds from soil and humic-like substances (HULIS), detected only recently as an ubiquitous aerosol constituent – the well-known secondary organic aerosol (SOA) from gas-to-particle conversion of mainly natural hydrocarbons. The halides from sea-spray are oxidized to halogenating compounds by photochemical, heterogeneous interactions involving ozone, OH radicals and other photooxidants, where reactive oxides of nitrogen (NO, NO2, NO3, N2O5) and acids play a decisive role. The resulting activated halogens (X, X2, XY, XO, HOX, XNO, XNO2 XONO2 with halogens X, Y = Cl, Br and I) may form organohalogen compounds, some of which are gaseous and some of which remain in the particles. The goal of the present study is to simulate this environmental situation (covering the full range from salt lakes and volcanic plumes via marine boundary layer to arctic conditions) in aerosol smog chamber experiments and to investigate it by a large variety of techniques, observing the activated halogens by the radical clock from time profiles of specific indicators and by direct, differential optical and cavity enhanced absorption spectroscopy (DOAS and CEAS), and detecting halogenated organics in gas and particle phase by specific techniques, such as GC-ECD, GC-HID, GC-MS, TPP-MS, direct aerosol-MS, ion chromatography and HPLC-DAD (including ICR-FTMS, AMS and CIMS from external collaborators and guests in campaigns). The contributions of Cl, Br and I to these geochemical cycles are settled by various supporting experiments, not to mention mandatory model calculations of the observations in the chamber experiments to be extrapolated to the boundary layer of the troposphere.

大陆气团和海洋气团的混合导致活性卤素与土壤腐殖质化合物和腐殖质样物质（HULIS）的相互作用，直到最近才被发现是一种普遍存在的气溶胶成分-众所周知的二次有机气溶胶（SOA），主要由天然碳氢化合物的气体到颗粒的转化。海雾中的卤化物通过光化学、臭氧、OH自由基和其他光氧化剂的非均相相互作用被氧化成卤化化合物，其中活性氧化物氮（NO, NO2, NO3, N2O5）和酸起决定性作用。生成的活化卤素（X, X2， XY， XO， HOX， XNO， XNO2 XONO2与卤素X， Y = Cl， Br和I）可以形成有机卤素化合物，其中一些是气态的，一些留在颗粒中。本研究的目标是在气溶胶烟雾室实验中模拟这种环境情况（覆盖从盐湖和火山羽流到海洋边界层到北极条件的全部范围），并通过多种技术进行研究，通过特定指标的时间曲线和直接、微分光学和腔增强吸收光谱（DOAS和CEAS）通过原子钟观察活化卤素。并通过特定技术检测气相和颗粒相中的卤化有机物，如GC-ECD， GC-HID, GC-MS, TPP-MS，直接气溶胶- ms，离子色谱和HPLC-DAD（包括ICR-FTMS， AMS和CIMS来自外部合作者和活动嘉宾）。Cl、Br和I对这些地球化学旋回的贡献是通过各种辅助实验确定的，更不用说将室内实验的观测结果外推到对流层边界层的强制性模式计算。