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The reactive uptake of carbonyl-containing volatile organic compounds (cVOCs)by aqueous atmospheric aerosols is a likely source of particulate organicmaterial. The aqueous-phase secondary organic products of some cVOCs aresurface-active. Therefore, cVOC uptake can lead to organic film formation atthe gas-aerosol interface and changes in aerosol surface tension. We examinedthe chemical reactions of two abundant cVOCs, formaldehyde and acetaldehyde, inwater and aqueous ammonium sulfate (AS) solutions mimicking troposphericaerosols. Secondary organic products were identified using Aerosol ChemicalIonization Mass Spectrometry (Aerosol-CIMS), and changes in surface tensionwere monitored using pendant drop tensiometry. Hemiacetal oligomers and aldolcondensation products were identified using Aerosol-CIMS. Acetaldehydedepresses surface tension to 65(\pm2) dyn/cm in pure water (a 10% surfacetension reduction from that of pure water) and 62(\pm1) dyn/cm in AS solutions(a 20.6% reduction from that of a 3.1 M AS solution). Surface tensiondepression by formaldehyde in pure water is negligible; in AS solutions, a 9%reduction in surface tension is observed. Mixtures of these species were alsostudied in combination with methylglyoxal in order to evaluate the influence ofcross-reactions on surface tension depression and product formation in thesesystems. We find that surface tension depression in the solutions containingmixed cVOCs exceeds that predicted by an additive model based on thesingle-species isotherms.

Reactive processing of formaldehyde and acetaldehyde in aqueous aerosol mimics: Surface tension depression and secondary organic products