Surface composition of size-selected sea salt particles under the influence of organic acids studied in situ using synchrotron radiation X-ray photoelectron spectroscopy

Minna Patanen; Isaak Unger; Clara-Magdalena Saak; Geethanjali Gopakumar; Rebecka Lexelius; Olle Björneholm; Matthew Salter; Paul Zieger
2022 | Environ. Sci. Atmos.

Sea spray aerosols play a key role in the climate system by scattering solar radiation and by serving as cloud condensation nuclei. Despite their importance, the impact of sea spray aerosols on global climate remains highly uncertain. One of the key knowledge gaps in our understanding of sea spray aerosol is the chemical composition of the particle surface, important for various atmospheric chemical processes, as a function of size and bulk composition. Here, we have applied X-ray photoelectron spectroscopy (XPS) to determine the surface composition of both pure inorganic sea salt aerosols and sea salt aerosols spiked with an amino acid (phenylalanine) and a straight chain fatty acid (octanoic acid). Importantly, the use of a differential mobility analyser allowed size-selection of 150, 250 and 350 nm monodisperse aerosol particles for comparison to polydisperse aerosol particles. We observed enrichment of magnesium at the particle surfaces relative to chloride in all aerosols tested, across all particle sizes. Interestingly, the magnitude of this enrichment was dependent on the type of organic present in the solution as well as the particle size. Our results suggest that the observed enrichment in magnesium is an inorganic effect which can be either enhanced or diminished by the addition of organic substances.

Probing the impact of a phytoplankton bloom on the chemistry of nascent sea spray aerosol using high-resolution mass spectrometry

Radoman, N.; Christiansen, S.; Johansson, J.H..; Hawkes, J.A.; Bilde, M.; Cousins, I.T.; Salter, M.E.
2022 | Environ. Sci. Atmos. | 2 (1152)

Socioeconomic status and public health in Australia: A wastewater-based study

Nikolaos I. Rousis; Zhe Li; Richard Bade; Michael S. McLachlan; Jochen F. Mueller; Jake W. O'Brien; Saer Samanipour; Benjamin J. Tscharke; Nikolaos S. Thomaidis; Kevin V. Thomas
2022 | Environ Int | 167

Grouping of PFAS for Human Health Risk Assessment: Findings from an Independent Panel of Experts

Anderson, J.K.; Brecher, R.W.; Cousins, I.T.; DeWitt, J.; Fiedler, H.5.; Kannan, K.; Kirman, C.R.; Lipscomb, J.8.; Priestly, B.; Schoeny. R.; Seed, J.; Verner, M.; Hays, S.M.
2022 | Regul. Toxicol. Pharmacol. | 134 (105226)

European scale assessment of the potential of ozonation and activated carbon treatment to reduce micropollutant emissions with wastewater

Pistocchi, A.; Alygizakisj, N.A.; Brack, W.; Boxall, A.; Cousins, I.T.; Drewes, J.E.; Finckh. S.; Gallé, T.; Launay, M.A.; McLachlan, M.S.; Petrovic, M.; Schulze, T.; Slobodnik, J.; Ternes, T.; Van Wezel, A.; Verlicchi, P.; Whalley, C.
2022 | Sci. Total Environ. | 848 (157124)

Combined Application of the Essential-Use and Functional Substitution Concepts: Accelerating Safer Alternatives

Roy, M.A..; Cousins, I.T.; Harriman, E.; Scheringer, M.; Tickner, J.A.; Wang, Z.
2022 | Environ. Sci. Technol. | 56 (14) (9842-9846)

Provningsjämförelse / Proficiency Test 2022-3, Närsalter / Nutrients

2022 | ACES rapport, Department of Environmental Science and Analytical Chemistry, Stockholm University | Report No: 52

Augmenting the Grammar of Science – The Community Science Exchange

Kevin J. Noone Jean J. Schensul Paula R. Buchanan
2022 | Community Science | 1 (1)

Physical and Chemical Properties of Cloud Droplet Residuals and Aerosol Particles During the Arctic Ocean 2018 Expedition

Linn Karlsson; Andrea Baccarini; Patrick Duplessis; Darrel Baumgardner; Ian M. Brooks; Rachel Y.-W. Chang; Lubna Dada; Kaspar R. Dällenbach; Liine Heikkinen; Radovan Krejci; W. Richard Leaitch; Caroline Leck; Daniel G. Partridge; Matthew E. Salter; Heini Wernli; Michael J. Wheeler; Julia Schmale; Paul Zieger
2022 | J. Geophys. Res.-Atmos. | 127 (e2021JD036383)

Detailed knowledge of the physical and chemical properties and sources of particles that form clouds is especially important in pristine areas like the Arctic, where particle concentrations are often low and observations are sparse. Here, we present in situ cloud and aerosol measurements from the central Arctic Ocean in August–September 2018 combined with air parcel source analysis. We provide direct experimental evidence that Aitken mode particles (particles with diameters ≲70 nm) significantly contribute to cloud condensation nuclei (CCN) or cloud droplet residuals, especially after the freeze-up of the sea ice in the transition toward fall. These Aitken mode particles were associated with air that spent more time over the pack ice, while size distributions dominated by accumulation mode particles (particles with diameters ≳70 nm) showed a stronger contribution of oceanic air and slightly different source regions. This was accompanied by changes in the average chemical composition of the accumulation mode aerosol with an increased relative contribution of organic material toward fall. Addition of aerosol mass due to aqueous-phase chemistry during in-cloud processing was probably small over the pack ice given the fact that we observed very similar particle size distributions in both the whole-air and cloud droplet residual data. These aerosol–cloud interaction observations provide valuable insight into the origin and physical and chemical properties of CCN over the pristine central Arctic Ocean.

Provningsjämförelse / Proficiency Test 2022-2, Metaller och spårämnen. Lukt och smak. / Metals and trace elements. Odor and taste.

2022 | ACES rapport, Department of Environmental Science and Analytical Chemistry, Stockholm University | Report No: 51

An analysis of how the current REACH processes may serve as a basis for implementing the “essential-use” concept for PFASs

Wang, Z.; Figuière, R.; Cousins, I.T.
2022 | Society of Environmental Toxicology and Chemistry (SETAC)

SETAC Europe 32nd Annual Meeting | May 19, 2022 | Copenhagen

Contact information

Visiting addresses:

Geovetenskapens Hus,
Svante Arrhenius väg 8, Stockholm

Arrheniuslaboratoriet, Svante Arrhenius väg 16, Stockholm (Unit for Toxicological Chemistry)

Mailing address:
Department of Environmental Science
Stockholm University
106 91 Stockholm

Press enquiries should be directed to:

Stella Papadopoulou
Science Communicator
Phone +46 (0)8 674 70 11