Size resolved online chemical analysis of nano aerosol particles : a thermal desorption differential mobility analyzer coupled to a chemical ionization time of flight mass spectrometer

  • A new method for size resolved chemical analysis of nucleation mode aerosol particles (size range from ~10 to ~30 nm) is presented. The Thermal Desorption Differential Mobility Analyzer (TD-DMA) uses an online, discontinuous principle. The particles are charged, a specific size is selected by differential mobility analysis and they are collected on a filament by electrostatic precipitation. Subsequently, the sampled mass is evaporated in a clean carrier gas and analyzed by a chemical ionization mass spectrometer. Gas phase measurements are performed with the same mass spectrometer during the sampling of particles. The characterization shows reproducible results, with a particle size resolution of 1.19 and the transmission efficiency for 15 nm particles being slightly above 50 %. The signal from the evaporation of a test substance can be detected starting from 0.01 ng and shows a linear response in the mass spectrometer. Instrument operation in the range of pg/m3 is demonstrated by an example measurement of 15 nm particles produced by nucleation from dimethylamine, sulfuric acid and water.

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Author:Andrea Christine Wagner, Anton Bergen, Sophia Brilke, Claudia Fuchs, Markus Ernst, Jesica Hoker, Martin Heinritzi, Mario Simon, Bertram Bühner, Joachim CurtiusORCiD, Andreas Kürten
Parent Title (English):Atmospheric measurement techniques discussions
Place of publication:Katlenburg-Lindau
Document Type:Article
Year of Completion:2019
Date of first Publication:2018/05/28
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2019/02/26
Page Number:34
First Page:1
Last Page:34
© Author(s) 2018. CC BY 4.0 License.
Institutes:Geowissenschaften / Geographie / Geowissenschaften
Wissenschaftliche Zentren und koordinierte Programme / Starker Start ins Studium: Qualitätspakt Lehre
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
Open-Access-Publikationsfonds:Geowissenschaften / Geographie
Licence (German):License LogoCreative Commons - Namensnennung 4.0