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@ARTICLE{Hohaus:276179,
author = {Hohaus, Thorsten and Gensch, Iulia and Kimmel, Joel and
Worsnop, Douglas R. and Kiendler-Scharr, Astrid},
title = {{E}xperimental determination of the partitioning
coefficient of β-pinene oxidation products in {SOA}s},
journal = {Physical chemistry, chemical physics},
volume = {17},
number = {22},
issn = {1463-9084},
address = {Cambridge},
publisher = {RSC Publ.},
reportid = {FZJ-2015-06646},
pages = {14796 - 14804},
year = {2015},
abstract = {The composition of secondary organic aerosols (SOAs) formed
by β-pinene ozonolysis was experimentally investigated in
the Juelich aerosol chamber. Partitioning of oxidation
products between gas and particles was measured through
concurrent concentration measurements in both phases.
Partitioning coefficients (Kp) of 2.23 × 10−5 ± 3.20 ×
10−6 m3 μg−1 for nopinone, 4.86 × 10−4 ± 1.80 ×
10−4 m3 μg−1 for apoverbenone, 6.84 × 10−4 ± 1.52
× 10−4 m3 μg−1 for oxonopinone and 2.00 × 10−3 ±
1.13 × 10−3 m3 μg−1 for hydroxynopinone were derived,
showing higher values for more oxygenated species. The
observed Kp values were compared with values predicted using
two different semi-empirical approaches. Both methods led to
an underestimation of the partitioning coefficients with
systematic differences between the methods. Assuming that
the deviation between the experiment and the model is due to
non-ideality of the mixed solution in particles, activity
coefficients of 4.82 × 10−2 for nopinone, 2.17 × 10−3
for apoverbenone, 3.09 × 10−1 for oxonopinone and 7.74 ×
10−1 for hydroxynopinone would result using the vapour
pressure estimation technique that leads to higher Kp. We
discuss that such large non-ideality for nopinone could
arise due to particle phase processes lowering the effective
nopinone vapour pressure such as diol- or dimer formation.
The observed high partitioning coefficients compared to
modelled results imply an underestimation of SOA mass by
applying equilibrium conditions.},
cin = {IEK-8},
ddc = {540},
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:000355633400055},
doi = {10.1039/C5CP01608H},
url = {https://juser.fz-juelich.de/record/276179},
}