Role of sea salt aerosols in the formation of aromatic secondary organic aerosol: yields and hygroscopic properties
Ross Beardsley A , Myoseon Jang A C , Baber Ori A , Yunseok Im A , Carrie A. Delcomyn B and Ned Witherspoon B
+ Author Affiliations
- Author Affiliations
A Department of Environmental Engineering Sciences, University of Florida, PO Box 116450, Gainesville, FL 32611, USA.
B Science, Technology, Analysis and Simulation Department, Naval Surface Warfare Center, Panama City, FL 32407, USA.
C Corresponding author. Email: mjang@ufl.edu
Environmental Chemistry 10(3) 167-177 https://doi.org/10.1071/EN13016
Submitted: 24 January 2013 Accepted: 27 April 2013 Published: 28 June 2013
Environmental context. In the coastal and ocean environment, oil spills and ship movement can produce hazardous, organic aerosols. In this study, the role of sea salt in the formation processes of crude-oil-derived organic aerosols derived was explored, and it was found that sea salt can greatly increase the formation and growth of these toxic aerosols. Understanding of this process is crucial for evaluating the effect of oil spills and ship movements on air quality and human health.
Abstract. Dual, large (52 m3), outdoor chambers were used to investigate the effect of aerosol aqueous phase chemistry on the secondary organic aerosol (SOA) yields of the photooxidation products of aromatic hydrocarbons in the coastal environment. Toluene and 1,3,5-trimethylbenzene were photochemically oxidised in the presence and absence of inorganic seeds (sea salt aerosol (SSA) or NaCl) at low NOx conditions. Overall, the presence of SSA, which was shown to contain water even at low relative humidities (RHs), led to higher SOA yields than the presence of NaCl seeds and the seedless condition. The results suggest that SOA yields in the coastal environment will be higher than those produced in terrestrial environment. To study the effect of SOA formation on the chemical composition of SSA, inorganic species were measured using a particle-into-liquid-sampler coupled to an ion chromatograph. The hygroscopic properties of the SSA internally mixed with SOA were analysed using a Fourier-transform infrared spectrometer. The fresh SSA shows a weak phase transition whereas no clear phase transition appeared in the aged SSA. The depletion of Cl– due to the accommodation of nitric acid and carboxylic acids on the surface of SSA coincides with changes in aerosol hygroscopic properties.
Additional keywords: aerosol water content, toluene, 1,3,5-trimethylbenzene.
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