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The reactive partitioning of cis and trans β-IEPOXwas investigated on hydrated inorganic seed particles, without the additionof acids. No organic aerosol (OA) formation was observed on dry ammoniumsulfate (AS); however, prompt and efficient OA growth was observed for thecis and trans β-IEPOX on AS seeds at liquid watercontents of 40–75% of the total particle mass. OA formation from IEPOX isa kinetically limited process, thus the OA growth continues if there is areservoir of gas-phase IEPOX. There appears to be no differences, withinerror, in the OA growth or composition attributable to thecis / trans isomeric structures. Reactive uptake of IEPOXonto hydrated AS seeds with added base (NaOH) also produced high OA loadings,suggesting the pH dependence for OA formation from IEPOX is weak for ASparticles. No OA formation, after particle drying, was observed on seedparticles where Na+ was substituted for NH4+. The Henry's Lawpartitioning 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 theparticles, but the chloride (Cl-) anion was substituted for sulfate(SO42-), possibly suggesting differences in nucleophilic strength ofthe anions. Online time-of-flight aerosol mass spectrometry and offlinefilter analysis provide evidence of oxygenated hydrocarbons, organosulfates,and amines in the particle organic composition. The results are consistentwith weak correlations between IEPOX-derived OA and particle acidity orliquid water observed in field studies, as the chemical system isnucleophile-limited and not limited in water or catalyst activity

Organic aerosol formation from the reactive uptake of isoprene epoxydiols (IEPOX) onto non-acidified inorganic seeds