Observations on the formation, growth and chemical composition of aerosols in an urban environment
Data(s) |
2014
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Resumo |
The charge and chemical composition of ambient particles in an urban environment were determined using a Neutral Particle and Air Ion Spectrometer and an Aerodyne compact Time-Of-Flight Aerosol Mass Spectrometer. Particle formation and growth events were observed on 20 of the 36 days of sampling, with eight of these events classified as strong. During these events, peaks in the concentration of intermediate and large ions were followed by peaks in the concentration of ammonium and sulphate, which were not observed in the organic fraction. Comparison of days with and without particle formation events revealed that ammonium and sulphate were the dominant species on particle formation days while high concentrations of biomass burning OA inhibited particle growth. Analyses of the degree of particle neutralisation lead us to conclude that an excess of ammonium enabled particle formation and growth. In addition, the large ion concentration increased sharply during particle growth, suggesting that during nucleation the neutral gaseous species ammonia and sulphuric acid react to form ammonium and sulphate ions. Overall, we conclude that the mechanism of particle formation and growth involved ammonia and sulphuric acid, with limited input from organics. |
Formato |
application/pdf |
Identificador | |
Publicador |
American Chemical Society |
Relação |
http://eprints.qut.edu.au/73848/2/73848.pdf DOI:10.1021/es5019509 Crilley, Leigh R., Jayaratne, Rohan, Ayoko, Godwin A., Miljevic, Branka, Ristovski, Zoran, & Morawska, Lidia (2014) Observations on the formation, growth and chemical composition of aerosols in an urban environment. Environmental Science and Technology, 48(12), pp. 6588-6596. |
Direitos |
Copyright 2014 American Chemical Society This document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental Science and Technology, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/es5019509 |
Fonte |
School of Chemistry, Physics & Mechanical Engineering; Institute of Health and Biomedical Innovation; Science & Engineering Faculty |
Palavras-Chave | #040101 Atmospheric Aerosols #050206 Environmental Monitoring #090799 Environmental Engineering not elsewhere classified #air quality #ambient particles #urban environment #particle formation |
Tipo |
Journal Article |