Development and application of a real-time method for the determination of selected compound classes (especially organic peroxides) in atmospheric aerosol particles using an aerosol mass spectrometer (AMS)

在大气气溶胶研究中使用气溶胶质谱仪(AMS，ATOFMS)是目前与气候、环境或健康有关的研究项目的重要组成部分。对于有机分析物，仍然是构成大气气溶胶的最不为人所知的一组化合物，通常使用AMS(气溶胶质谱仪)，特别是因为它能够提供关于有机组分的尺寸分辨信息和一定量的化学信息(区分3-4个化合物类别，如HOA、OOA、BBOA或估计O/C比)。个别化合物或化合物类别(HOA、OOA等除外)无法测量。这就是本研究提案的目标：在气溶胶颗粒进入AMS之前，使用气态试剂对选定的化合物类--重点是有机过氧化物类--进行衍生化。对于颗粒相过氧化氢的测定，将使用气态碘化氢，它将在颗粒相中被氧化成分子碘，最终产物(分子碘)将被输送到AMS中，在那里被电离(EI)和定量。最终目标是提供一种移动研究仪器，然后可用于大气模拟室的重点研究活动或专门的实地研究。

The use of aerosol mass spectrometers (AMS, ATOFMS) in atmospheric aerosol research is an essential part of current research projects in connection with climate, environmental or health related projects. For organic analytes, still the least understood group of compounds composing atmospheric aerosols, often the AMS (aerosol mass spectrometer) is used, especially due to its ability to deliver size-resolved information about the organic fraction with a certain amount of chemical information (differentiation of 3-4 compound classes, such as HOA, OOA, BBOA, or estimation of the O/C-ratio). Individual compounds or compound classes (other than HOA, OOA etc.) cannot be measured. This is the goal of the presented research proposal: Before the aerosol particles enter the AMS, selected compound classes - with a focus on organic peroxides - are derivatized using gaseous reagents. For the determination of particle phase peroxides gaseous hydrogen iodide will be used, which will be oxidized in the particle phase to molecular iodine and the product (molecular iodine) will finally be transported into the AMS where it is ionized (EI) and quantified. The final objective is to provide a mobile research instrument, which can then be used in focused research campaigns at atmospheric simulation chambers or in dedicated field studies.