TY - JOUR
T1 - Gas-to-Particle Partitioning of Products from Ozonolysis of Δ3-Carene and the Effect of Temperature and Relative Humidity
AU - Li, Linjie
AU - Thomsen, Ditte
AU - Wu, Cheng
AU - Priestley, Michael
AU - Iversen, Emil Mark
AU - Tygesen Skønager, Jane
AU - Luo, Yuanyuan
AU - Ehn, Mikael
AU - Roldin, Pontus
AU - Pedersen, Henrik B
AU - Bilde, Merete
AU - Glasius, Marianne
AU - Hallquist, Mattias
PY - 2024/2/8
Y1 - 2024/2/8
N2 - Formation of oxidized products from Δ
3-carene (C
10H
16) ozonolysis and their gas-to-particle partitioning at three temperatures (0, 10, and 20 °C) under dry conditions (<2% RH) and also at 10 °C under humid (78% RH) conditions were studied using a time-of-flight chemical ionization mass spectrometer (ToF-CIMS) combined with a filter inlet for gases and aerosols (FIGAERO). The Δ
3-carene ozonolysis products detected by the FIGAERO-ToF-CIMS were dominated by semivolatile organic compounds (SVOCs). The main effect of increasing temperature or RH on the product distribution was an increase in fragmentation of monomer compounds (from C
10 to C
7 compounds), potentially via alkoxy scission losing a C
3 group. The equilibrium partitioning coefficient estimated according to equilibrium partitioning theory shows that the measured SVOC products distribute more into the SOA phase as the temperature decreases from 20 to 10 and 0 °C and for most products as the RH increases from <2 to 78%. The temperature dependency of the saturation vapor pressure (above an assumed liquid state), derived from the partitioning method, also allows for a direct way to obtain enthalpy of vaporization for the detected species without accessibility of authentic standards of the pure substances. This method can provide physical properties, beneficial for, e.g., atmospheric modeling, of complex multifunctional oxidation products.
AB - Formation of oxidized products from Δ
3-carene (C
10H
16) ozonolysis and their gas-to-particle partitioning at three temperatures (0, 10, and 20 °C) under dry conditions (<2% RH) and also at 10 °C under humid (78% RH) conditions were studied using a time-of-flight chemical ionization mass spectrometer (ToF-CIMS) combined with a filter inlet for gases and aerosols (FIGAERO). The Δ
3-carene ozonolysis products detected by the FIGAERO-ToF-CIMS were dominated by semivolatile organic compounds (SVOCs). The main effect of increasing temperature or RH on the product distribution was an increase in fragmentation of monomer compounds (from C
10 to C
7 compounds), potentially via alkoxy scission losing a C
3 group. The equilibrium partitioning coefficient estimated according to equilibrium partitioning theory shows that the measured SVOC products distribute more into the SOA phase as the temperature decreases from 20 to 10 and 0 °C and for most products as the RH increases from <2 to 78%. The temperature dependency of the saturation vapor pressure (above an assumed liquid state), derived from the partitioning method, also allows for a direct way to obtain enthalpy of vaporization for the detected species without accessibility of authentic standards of the pure substances. This method can provide physical properties, beneficial for, e.g., atmospheric modeling, of complex multifunctional oxidation products.
UR - http://www.scopus.com/inward/record.url?scp=85184664572&partnerID=8YFLogxK
U2 - 10.1021/acs.jpca.3c07316
DO - 10.1021/acs.jpca.3c07316
M3 - Journal article
C2 - 38293769
SN - 1089-5639
VL - 128
SP - 918
EP - 928
JO - The journal of physical chemistry. A
JF - The journal of physical chemistry. A
IS - 5
ER -