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)

气溶胶质谱仪（AMS，ATOFMS）在大气气溶胶研究中的应用是当前与气候，环境或健康相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化合物中最不了解的一组，通常使用AMS（气溶胶质谱仪），特别是由于其能够提供关于有机部分的尺寸分辨信息以及一定量的化学信息（区分3-4种化合物类别，如HOA，OOA，BBOA或估计O/C比）。单个化合物或化合物类别（HOA、OOA等除外）无法衡量。这是所提出的研究提案的目标：在气溶胶颗粒进入AMS之前，使用气体试剂对选定的化合物类别（重点是有机过氧化物）进行衍生化。对于颗粒相过氧化物的测定，将使用气态碘化氢，其将在颗粒相中氧化成分子碘，产物（分子碘）最终将被输送到AMS中，在AMS中电离（EI）并定量。最终目标是提供一种移动的研究仪器，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.