A new oxidation flow reactor for the measurements of secondary aerosol formation: Characterisation and a case study
Description
Oxidation flow reactors (OFRs) have been extensively used to investigate secondary aerosol formation of the ambient air or emission sources such as biomass burning or vehicular emissions, and they can provide useful information on the mechanisms of secondary aerosol formation. Here we present the design and characteristics of a newly developed OFR, named the Rapid Aerosol Ageing Device (RAAD). The RAAD was specially designed to provide time-resolved and fast-response chemical evolution of aged aerosols and can be applied to investigate how oxidative stress levels change upon ageing. The characterisation experiments included optimisation of the flow rate, residence time distributions for gas and particles, transmission efficiencies of particles, OH exposures with varying O3 concentrations and relative humidity conditions. Results show that the RAAD has near-laminar flow conditions at a total flow rate of 45 slpm with a low surface-area-to-volume ratio of 26.52 m-1. Wall losses for particles with mobility diameters greater than 40 nm are negligible, and narrow residence time distributions of gas and particles were observed. These features allow a better response to the ageing of rapid-changing emission sources, and measurements can be taken directly for instruments demanding high flow rates without diluting the samples. Additionally, the performance of the RAAD was further evaluated by measuring the secondary aerosol formation of biomass burning emissions. The organic aerosol enhancement ratios were comparable with other ageing studies, with an average value of 1.31 ± 0.05. In addition, the absorption Ångström exponent (AAE) value decreased from 1.7 ± 0.05 (primary emissions) to 1.4 ± 0.06 upon ageing. Overall, the RAAD is suitable for studying the formation mechanisms of photochemically aged aerosols from emission sources, and future work will aim to provide more details on the secondary aerosol production from ambient air.
Impact and interest:
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| ID Code: | 244133 | ||||||
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| Item Type: | Contribution to Journal (Journal Article) | ||||||
| Refereed: | Yes | ||||||
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| Additional Information: | Funding Information: The design and construction of the RAAD was supported by the National Natural Science Foundation of China (NSFC) grant (Grant No. 21650110455). This study was also partially supported by the Australian Research Council (ARC) Discovery grant (DP180102632). The first author thanks for the financial support from Queensland University of Technology (QUT) and Jinan University for the PhD scholarship. The authors would like to appreciate Dr Joel Alroe from ILAQH, QUT for the calibration of AMS prior to the commencement of the experiment. The authors also thank the Lone Pine Koala Sanctuary, Brisbane for providing the eucalyptus leaves. | ||||||
| Measurements or Duration: | 10 pages | ||||||
| Keywords: | Eucalyptus leaves burning, Flaming, Light absorption, Oxidation flow reactor, Secondary aerosol formation | ||||||
| DOI: | 10.1016/j.atmosenv.2023.119886 | ||||||
| ISSN: | 1352-2310 | ||||||
| Pure ID: | 148642437 | ||||||
| Divisions: | Current > QUT Faculties and Divisions > Faculty of Science Current > Schools > School of Earth & Atmospheric Sciences |
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| Funding Information: | The design and construction of the RAAD was supported by the National Natural Science Foundation of China (NSFC) grant (Grant No. 21650110455). This study was also partially supported by the Australian Research Council (ARC) Discovery grant (DP180102632). The first author thanks for the financial support from Queensland University of Technology (QUT) and Jinan University for the PhD scholarship. The authors would like to appreciate Dr Joel Alroe from ILAQH, QUT for the calibration of AMS prior to the commencement of the experiment. The authors also thank the Lone Pine Koala Sanctuary, Brisbane for providing the eucalyptus leaves. The design and construction of the RAAD was supported by the National Natural Science Foundation of China (NSFC) grant (Grant No. 21650110455 ). This study was also partially supported by the Australian Research Council (ARC) Discovery grant ( DP180102632 ). The first author thanks for the financial support from Queensland University of Technology (QUT) and Jinan University for the PhD scholarship. The authors would like to appreciate Dr Joel Alroe from ILAQH, QUT for the calibration of AMS prior to the commencement of the experiment. The authors also thank the Lone Pine Koala Sanctuary, Brisbane for providing the eucalyptus leaves. | ||||||
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| Copyright Owner: | 2023 Elsevier Ltd | ||||||
| Copyright Statement: | This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au | ||||||
| Deposited On: | 27 Oct 2023 00:54 | ||||||
| Last Modified: | 23 Jul 2024 22:26 |
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