Publication: Organic aerosol formation from the reactive uptake of isoprene epoxydiols (IEPOX) onto non-acidified inorganic seeds
Publication - Organic aerosol formation from the reactive uptake of isoprene epoxydiols (IEPOX) onto non-acidified inorganic seeds
Title:
Organic aerosol formation from the reactive uptake of isoprene epoxydiols (IEPOX) onto non-acidified inorganic seeds
DOI:
10.5194/acp-14-3497-2014
Publication Year:
2014
Author list:
Tran B Nguyen, Matthew M Coggon, Kelvin H Bates, Xuan Zhang, Rebecca H Schwantes, Katherine A Schilling, Christine L Loza, Richard C Flagan, Paul O Wennberg, John H Seinfeld
Journal Short Name:
ACP
Publisher:
Copernicus
Abstract
The reactive partitioning of cis and trans β-IEPOX was investigated on hydrated inorganic seed particles, without the addition of acids. No organic aerosol (OA) formation was observed on dry ammonium sulfate (AS); however, prompt and efficient OA growth was observed for the cis and trans β-IEPOX on AS seeds at liquid water contents of 40–75% of the total particle mass. OA formation from IEPOX is a kinetically limited process, thus the OA growth continues if there is a reservoir of gas-phase IEPOX. There appears to be no differences, within error, in the OA growth or composition attributable to the cis / trans isomeric structures. Reactive uptake of IEPOX onto hydrated AS seeds with added base (NaOH) also produced high OA loadings, suggesting the pH dependence for OA formation from IEPOX is weak for AS particles. No OA formation, after particle drying, was observed on seed particles where Na+ was substituted for NH4+. The Henry's Law partitioning of IEPOX was measured on NaCl particles (ionic strength ~9 M) to be 3 × 107 M atm−1 (−50 / +100%). A small quantity of OA was produced when NH4+ was present in the particles, but the chloride (Cl-) anion was substituted for sulfate (SO42-), possibly suggesting differences in nucleophilic strength of the anions. Online time-of-flight aerosol mass spectrometry and offline filter analysis provide evidence of oxygenated hydrocarbons, organosulfates, and amines in the particle organic composition. The results are consistent with weak correlations between IEPOX-derived OA and particle acidity or liquid water observed in field studies, as the chemical system is nucleophile-limited and not limited in water or catalyst activity.Additional Notes
Experiments (13)
ID | Name | Start date | Experiment Category | Reaction Type | Reactant(s) | Oxidant Name | Temperature | Humidity | Type of Seed | RO2 Main Fate | Data Sets (count) | Actions |
---|---|---|---|---|---|---|---|---|---|---|---|---|
598 | Caltech Atmospheric Chamber_20130325_cis-beta IEPOX_None_Ammonium sulfate_DarkReactiveUptake_RH53 | 2013-03-25 | Condensed-phase chemical reaction, Multiphase chemical reaction | Heterogeneous oxidation , Other aqueous/aerosol phase | cis-beta IEPOX | None | 22 | 53 | Ammonium sulfate | Not applicable | 3 | Download |
599 | Caltech Atmospheric Chamber_20130327_cis-beta IEPOX_None_Ammonium sulfate_DarkReactiveUptake_RHdry | 2013-03-27 | Condensed-phase chemical reaction, Multiphase chemical reaction | Heterogeneous oxidation , Other aqueous/aerosol phase | cis-beta IEPOX | None | 22 | 2 | Ammonium sulfate | Not applicable | 3 | Download |
600 | Caltech Atmospheric Chamber_20130329_cis-beta IEPOX_None_Ammonium sulfate_DarkReactiveUptake_RH86 | 2013-03-29 | Condensed-phase chemical reaction, Multiphase chemical reaction | Heterogeneous oxidation , Other aqueous/aerosol phase | cis-beta IEPOX | None | 22 | 86 | Ammonium sulfate | Not applicable | 3 | Download |
601 | Caltech Atmospheric Chamber_20130408_cis-beta IEPOX_None_Ammonium sulfate_DarkReactiveUptake_RH42 | 2013-04-08 | Condensed-phase chemical reaction, Multiphase chemical reaction | Heterogeneous oxidation , Other aqueous/aerosol phase | cis-beta IEPOX | None | 22 | 42 | Ammonium sulfate | Not applicable | 3 | Download |
602 | Caltech Atmospheric Chamber_20130603_trans-beta IEPOX_None_Ammonium sulfate_DarkReactiveUptake_RHdry | 2013-06-03 | Condensed-phase chemical reaction, Multiphase chemical reaction | Heterogeneous oxidation , Other aqueous/aerosol phase | trans-beta IEPOX | None | 22 | 2 | Ammonium sulfate | Not applicable | 3 | Download |
603 | Caltech Atmospheric Chamber_20130605_trans-beta IEPOX_None_Ammonium sulfate_DarkReactiveUptake_RH39 | 2013-06-05 | Condensed-phase chemical reaction, Multiphase chemical reaction | Heterogeneous oxidation , Other aqueous/aerosol phase | trans-beta IEPOX | None | 22 | 39 | Ammonium sulfate | Not applicable | 3 | Download |
604 | Caltech Atmospheric Chamber_20130607_trans-beta IEPOX_None_Ammonium sulfate_DarkReactiveUptake_RH57 | 2013-06-07 | Condensed-phase chemical reaction, Multiphase chemical reaction | Heterogeneous oxidation , Other aqueous/aerosol phase | trans-beta IEPOX | None | 22 | 57 | Ammonium sulfate | Not applicable | 3 | Download |
605 | Caltech Atmospheric Chamber_20130902_trans-beta IEPOX_None_Sodium chloride_DarkReactiveUptake_RH60 | 2013-09-02 | Condensed-phase chemical reaction, Multiphase chemical reaction | Heterogeneous oxidation , Other aqueous/aerosol phase | trans-beta IEPOX | None | 22 | 60 | Sodium chloride | Not applicable | 3 | Download |
606 | Caltech Atmospheric Chamber_20130904_trans-beta IEPOX_None_Ammonium chloride_DarkReactiveUptake_RH86 | 2013-09-04 | Condensed-phase chemical reaction, Multiphase chemical reaction | Heterogeneous oxidation , Other aqueous/aerosol phase | trans-beta IEPOX | None | 22 | 86 | Ammonium chloride | Not applicable | 3 | Download |
607 | Caltech Atmospheric Chamber_20130906_trans-beta IEPOX_None_Sodium sulfate_DarkReactiveUptake_RH81 | 2013-09-06 | Condensed-phase chemical reaction, Multiphase chemical reaction | Heterogeneous oxidation , Other aqueous/aerosol phase | trans-beta IEPOX | None | 22 | 81 | Sodium sulfate | Not applicable | 3 | Download |
608 | Caltech Atmospheric Chamber_20130908_trans-beta IEPOX_None_Ammonium sulfate_DarkReactiveUptake_RH69_addedNaOH | 2013-09-08 | Condensed-phase chemical reaction, Multiphase chemical reaction | Heterogeneous oxidation , Other aqueous/aerosol phase | trans-beta IEPOX | None | 22 | 69 | Ammonium sulfate | Not applicable | 3 | Download |
623 | Caltech Atmospheric Chamber_20130410_trans-beta IEPOX/hydrogen peroxide_Hydroxyl radical_Ammonium sulfate | 2013-04-10 | Condensed-phase chemical reaction, Multiphase chemical reaction | Photooxidation , Heterogeneous oxidation , Other aqueous/aerosol phase | trans-beta IEPOX, hydrogen peroxide | Hydroxyl radical | 16-22 | 50-83 | Ammonium sulfate | HO2 | 3 | Download |
624 | Caltech Atmospheric Chamber_20130415_trans-beta IEPOX/hydrogen peroxide_Hydroxyl radical_Ammonium sulfate_AqueousPhotooxidation | 2013-04-15 | Condensed-phase chemical reaction, Multiphase chemical reaction | Photooxidation , Heterogeneous oxidation , Other aqueous/aerosol phase | trans-beta IEPOX, hydrogen peroxide | Hydroxyl radical | 16-22 | 49-80 | Ammonium sulfate | HO2 | 3 | Download |