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<p style="margin:0in;vertical-align:baseline"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#464646">Czech, Hendryk, Yli-Pirilä, Pasi, Tiitta, Petri, Ihalainen, Mika, Hartikainen, Anni, Schneider, Eric, Martens, Patrick, Paul, Andreas,
Hohaus, Thorsten, Rüger, Christopher P., Jokiniemi, Jorma, Zimmermann, Ralf, Sippula, Olli, The effect of aging conditions at equal OH exposure in an oxidation flow reactor on the composition of toluene-derived secondary organic aerosols, Environ. Sci.: Atmos.,
Advance Articles, </span><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:black"><a href="http://dx.doi.org/10.1039/D4EA00027G"><span style="font-size:12.0pt;font-family:"Calibri",sans-serif">http://dx.doi.org/10.1039/D4EA00027G</span></a></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#464646">,
2024. </span><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif;color:#464646">Abstract</span></b><span style="font-family:"Calibri",sans-serif;color:#464646">. Oxidation flow reactors (OFRs) have been increasingly used to conduct research on secondary
aerosol formation potential and composition in laboratory and field studies by exposing aerosols to high levels of oxidants in short time periods. In order to assess the atmospheric relevance of the triggered chemical reactions, kinetic models have been developed
to reveal the production of atmospheric oxidants and the fate of volatile organic compounds (VOCs). However, it is unknown how different OFR conditions generating the same OH exposure affect the chemical and physical properties of the secondary aerosol particle
phase because the model is based on gas phase chemistry. Toluene as a well-investigated precursor of secondary organic aerosols (SOAs) was aged in the high-volume OFR “PEAR” at three different external OH reactivities (OHRext) and in an environmental chamber
at the same OH exposure of (1.09 ± 0.09) × 10<sup>11</sup> s cm<sup>−3</sup>. These specific OFR conditions altered the majority of the investigated chemical and physical properties of the toluene-derived SOA (tol-SOA). However, OFR-aging at low OHRext associated
with atmospherically relevant conditions did not lead to physical and chemical SOA properties most similar to chamber-generated SOAs at the same low OHRext. Particularly, for the most detailed chemical analysis by electrospray (ESI) high-resolution Orbitrap
mass spectrometry (HRMS), tol-SOA from the PEAR at high OHRext, deviating from atmospherically relevant conditions, and the chamber were most different to tol-SOA from the PEAR with low and medium OHRext. Our study challenges the concept of atmospherically
relevant OFR aerosol aging and motivates further exploration of OFR conditions on secondary aerosol composition.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#464646"><o:p> </o:p></span></p>
<p class="MsoNormal"><a href="https://sites.google.com/site/pamwiki/publications-using-other-oxidation-flow-reactors">PAM Wiki - Publications Using Other Oxidation Flow Reactors (google.com)</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-ligatures:none">Andrew Lambe<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-ligatures:none">Principal Scientist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-ligatures:none">Aerodyne Research, Inc. <o:p>
</o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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