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• W2057479843 abstract "In this work, light-absorption measurements were carried out on quartz-fibre and PTFE (i.e. Teflon ® ) filters using a home-made polar photometer in order to assess the role of organic sampling artefacts on optical measurements. Filter-based light-absorption instruments are generally operated with quartz/glass-fibre filter tapes and – as far as we know – currently there are no systematic studies on the sampling artefacts affecting the light absorption coefficient measurements. In this work, particulate matter (PM) samples were collected in Milan (Italy) during different sampling campaigns with the aim of (1) validating the polar photometer; (2) comparing the absorption properties measured on PM collected on different filter media; (3) investigating the causes of the observed differences. The polar photometer was demonstrated to give aerosol light absorption coefficients ( σ ap in Mm −1 ) fully comparable to those obtained by a Multi-Angle Absorption Photometer (MAAP) when using quartz-fibre filters to collect atmospheric particles. The aerosol light absorption coefficients determined on samples collected in parallel on quartz-fibre and PTFE filters showed significant differences (about 40%). These differences were much lower (i.e. 8%) when the quartz-fibre filter sampling line was equipped with a denuder to remove organic gases from the incoming air stream evidencing a relevant role of organic sampling artefacts in light absorption measurements by filter-based systems. • Set-up of an optical system for aerosol light absorption measurements on filters. • Validation of the home made instrument using a MAAP as benchmark. • Differences in light absorption coefficients recorded on different filter media. • Role of organic sampling artefacts in optical measurements." @default.
• W2057479843 created "2016-06-24" @default.
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• W2057479843 date "2014-04-01" @default.
• W2057479843 modified "2023-09-24" @default.
• W2057479843 title "A filter-based light-absorption measurement with polar photometer: Effects of sampling artefacts from organic carbon" @default.
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• W2057479843 doi "https://doi.org/10.1016/j.jaerosci.2013.12.012" @default.
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