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@ARTICLE{Gkatzelis:844858,
author = {Gkatzelis, Georgios I. and Tillmann, Ralf and Hohaus,
Thorsten and Müller, Markus and Eichler, Philipp and Xu,
Kang-Ming and Schlag, Patrick and Schmitt, Sebastian H. and
Wegener, Robert and Kaminski, Martin and Holzinger, Rupert
and Wisthaler, Armin and Kiendler-Scharr, Astrid},
title = {{C}omparison of three aerosol chemical characterization
techniques utilizing {PTR}-{T}o{F}-{MS}: a study on freshly
formed and aged biogenic {SOA}},
journal = {Atmospheric measurement techniques},
volume = {11},
number = {3},
issn = {1867-8548},
address = {Katlenburg-Lindau},
publisher = {Copernicus},
reportid = {FZJ-2018-02209},
pages = {1481 - 1500},
year = {2018},
abstract = {An intercomparison of different aerosol chemical
characterization techniques has been performed as part of a
chamber study of biogenic secondary organic aerosol (BSOA)
formation and aging at the atmosphere simulation chamber
SAPHIR (Simulation of Atmospheric PHotochemistry In a large
Reaction chamber). Three different aerosol sampling
techniques – the aerosol collection module (ACM), the
chemical analysis of aerosol online (CHARON) and the
collection thermal-desorption unit (TD) were connected to
proton transfer reaction time-of-flight mass spectrometers
(PTR-ToF-MSs) to provide chemical characterization of the
SOA. The techniques were compared among each other and to
results from an aerosol mass spectrometer (AMS) and a
scanning mobility particle sizer (SMPS). The experiments
investigated SOA formation from the ozonolysis of β-pinene,
limonene, a β-pinene–limonene mix and real plant
emissions from Pinus sylvestris L. (Scots pine). The SOA was
subsequently aged by photo-oxidation, except for limonene
SOA, which was aged by NO3 oxidation.Despite significant
differences in the aerosol collection and desorption methods
of the PTR-based techniques, the determined chemical
composition, i.e. the same major contributing signals, was
found by all instruments for the different chemical systems
studied. These signals could be attributed to known products
expected from the oxidation of the examined monoterpenes.
The sampling and desorption method of ACM and TD provided
additional information on the volatility of individual
compounds and showed relatively good agreement.Averaged over
all experiments, the total aerosol mass recovery compared to
an SMPS varied within 80 ± 10, 51 ± 5 and
$27 ± 3 \%$ for CHARON, ACM and TD, respectively.
Comparison to the oxygen-to-carbon ratios (O : C)
obtained by AMS showed that all PTR-based techniques
observed lower O : C ratios, indicating a loss of
molecular oxygen either during aerosol sampling or
detection. The differences in total mass recovery and
O : C between the three instruments resulted
predominantly from differences in the field strength (E∕N)
in the drift tube reaction ionization chambers of the
PTR-ToF-MS instruments and from dissimilarities in the
collection/desorption of aerosols. Laboratory case studies
showed that PTR-ToF-MS E∕N conditions influenced
fragmentation which resulted in water and further neutral
fragment losses of the detected molecules. Since ACM and TD
were operated in higher E∕N than CHARON, this resulted in
higher fragmentation, thus affecting primarily the detected
oxygen and carbon content and therefore also the mass
recovery. Overall, these techniques have been shown to
provide valuable insight on the chemical characteristics of
BSOA and can address unknown thermodynamic properties such
as partitioning coefficient values and volatility patterns
down to a compound-specific level.},
cin = {IEK-8},
ddc = {550},
cid = {I:(DE-Juel1)IEK-8-20101013},
pnm = {243 - Tropospheric trace substances and their
transformation processes (POF3-243)},
pid = {G:(DE-HGF)POF3-243},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000427534700001},
doi = {10.5194/amt-11-1481-2018},
url = {https://juser.fz-juelich.de/record/844858},
}