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Scoping studies to establish the capability and utility of a real-time bioaerosol sensor to characterise emissions from environmental sources

Nasir, Zaheer Ahmad; Hayes, Enda; Williams, Ben; Gladding, Toni; Rolph, Catherine; Khera, Shagun; Jackson, Simon; Bennett, Allan; Collins, Samuel; Parks, Simon; Attwood, Alexis; Kinnersley, Robert; Walsh, Kerry; Garcia-Alcega, Sonia; Pollard, Simon; Drew, Gill; Coulon, Frederic; Tyrrel, Sean

Authors

Zaheer Ahmad Nasir

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Enda Hayes enda.hayes@uwe.ac.uk
Professor in Air Quality and Carbon Management

Ben Williams Ben3.Williams@uwe.ac.uk
Research Fellow in Air Quality Management Resource Centre

Toni Gladding

Catherine Rolph

Shagun Khera

Simon Jackson

Allan Bennett

Samuel Collins

Simon Parks

Alexis Attwood

Robert Kinnersley

Kerry Walsh

Sonia Garcia-Alcega

Simon Pollard

Gill Drew

Frederic Coulon

Sean Tyrrel



Abstract

A novel dual excitation wavelength based bioaerosol sensor with multiple fluorescence bands called Spectral Intensity Bioaerosol Sensor (SIBS) has been assessed across five contrasting outdoor environments. The mean concentrations of total and fluorescent particles across the sites were highly variable being the highest at the agricultural farm (2.6 cm−3 and 0.48 cm−3, respectively) and the composting site (2.32 cm−3 and 0.46 cm−3, respectively) and the lowest at the dairy farm(1.03 cm−3 and 0.24 cm−3, respectively) and the sewage treatment works (1.03 cm−3 and 0.25 cm−3, respectively). In contrast, thenumber-weighted fluorescent fraction was lowest at the agricultural site (0.18) in comparison to the other sites indicating high variability in nature and magnitude of emissions from environmental sources. The fluorescence emissions data demonstrated that the spectra at different sites were multimodal with intensity differences largely at wavelengths located in secondary emission peaks for λex 280 and λex 370. This finding suggests differences in the molecular composition of emissions at these sites which can help to identify distinct fluorescence signature of different environmental sources. Overall this study demonstrated that SIBS provides additional spectral information compared to existing instruments and capability to resolve spectrally integrated signals fromrelevant biological fluorophores could improve selectivity and thus enhance discrimination and classification strategies for real-time characterisation of bioaerosols

Journal Article Type Article
Publication Date Jan 15, 2019
Journal Science of the Total Environment
Print ISSN 0048-9697
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 648
Pages 25-32
APA6 Citation Nasir, Z. A., Hayes, E., Williams, B., Gladding, T., Rolph, C., Khera, S., …Tyrrel, S. (2019). Scoping studies to establish the capability and utility of a real-time bioaerosol sensor to characterise emissions from environmental sources. Science of the Total Environment, 648, 25-32
Keywords real-time monitoring, bioaerosols, emissions characterisation, fluorescence spectra

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