Influence of organic acids on the surface composition of sea spray aerosol
Unger, Isaak; Saak, Clara-Magdalena; Salter, Matthew; Zieger, Paul; Patanen, Minna; Björneholm, Olle (2019-12-13)
J. Phys. Chem. A 2020, 124, 2, 422-429. https://doi.org/10.1021/acs.jpca.9b09710
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of physical chemistry A, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpca.9b09710.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe202001233146
Tiivistelmä
Abstract
Recent studies on sea spray aerosol indicate an enrichment of Ca2+ in small particles, which are often thought to originate from the very surface of a water body when bubbles burst. One model to explain this observation is the formation of ion pairs between Ca2+(aq) and surface-active organic species. In this study, we have used X-ray photoelectron spectroscopy to probe aqueous salt solutions and artificial sea spray aerosol to study whether ion pairing in the liquid environment also affects the surface composition of dry aerosol. Carboxylic acids were added to the sample solutions to mimic some of the organic compounds present in natural seawater. Our results show that the formation of a core–shell structure governs the surface composition of the aerosol. The core–shell structure contrasts previous observations of the dry sea spray aerosol on substrates. As such, this may indicate that substrates can impact the morphology of the dried aerosol.
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