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@ARTICLE{Saarikoski:868114,
author = {Saarikoski, Sanna and Williams, Leah R. and Spielman,
Steven R. and Lewis, Gregory S. and Eiguren-Fernandez,
Arantzazu and Aurela, Minna and Hering, Susanne V. and
Teinilä, Kimmo and Croteau, Philip and Jayne, John T. and
Hohaus, Thorsten and Worsnop, Douglas R. and Timonen,
Hilkka},
title = {{L}aboratory and field evaluation of the {A}erosol
{D}ynamics {I}nc. concentrator ({ADI}c) for aerosol mass
spectrometry},
journal = {Atmospheric measurement techniques},
volume = {12},
number = {7},
issn = {1867-8548},
address = {Katlenburg-Lindau},
publisher = {Copernicus},
reportid = {FZJ-2019-06701},
pages = {3907 - 3920},
year = {2019},
abstract = {An air-to-air ultrafine particle concentrator (Aerosol
Dynamics Inc. concentrator; ADIc) has been designed to
enhance online chemical characterization of ambient aerosols
using aerosol mass spectrometry. The ADIc employs a
three-stage, moderated water-based condensation growth tube
coupled to an aerodynamic focusing nozzle to concentrate
fine particles into a portion of the flow. The system can be
configured to sample between 1.0 and 1.7 L min−1, with
an output concentrated flow between 0.08 and
0.12 L min−1, resulting in a theoretical concentration
factor (sample flow / output flow) ranging from 8 to 21.
Laboratory tests with monodisperse particles show that the
ADIc is effective for particles as small as 10 nm.
Laboratory experiments conducted with the Aerosol Mass
Spectrometer (AMS) showed no shift in the particle size with
the ADIc, as measured by the AMS particle time-of-flight
operation. The ADIc-AMS system was operated unattended over
a 1-month period near Boston, Massachusetts. Comparison to a
parallel AMS without the concentrator showed concentration
factors of 9.7±0.15 and 9.1±0.1 for sulfate and nitrate,
respectively, when operated with a theoretical concentration
factor of 10.5±0.3. The concentration factor of organics
was lower, possibly due to the presence of large particles
from nearby road-paving operations and a difference in
aerodynamic lens cutoff between the two AMS instruments.
Another field deployment was carried out in Helsinki,
Finland. Two ∼10 d measurement periods showed good
correlation for the concentrations of organics, sulfate,
nitrate and ammonium measured with an Aerosol Chemical
Speciation Monitor (ACSM) with the ADIc and a parallel AMS
without the concentrator. Additional experiments with an AMS
alternating between the ADIc and a bypass line demonstrated
that the concentrator did not significantly change the size
distribution or the chemistry of the ambient aerosol
particles.},
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:000475618100001},
doi = {10.5194/amt-12-3907-2019},
url = {https://juser.fz-juelich.de/record/868114},
}