Journal
INDOOR AIR
Volume 30, Issue 5, Pages 914-924Publisher
WILEY
DOI: 10.1111/ina.12662
Keywords
cooking; indoor surfaces; ozone; skin oil; surface alkenes; surface films
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Funding
- Alfred P. Sloan Foundation [G-2016-7173]
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Indoor surfaces are known to support organic films, but their thickness, composition, and variability between environments remain poorly characterized. Alkenes are expected to be a significant component of these films, with the reaction with O-3 being a major sink for O-3 and source of airborne chemicals. Here, we present a sensitive, microscale, nanospectrophotometric method for quantifying the alkene (C=C bond) content of surface films and demonstrate its applicability in five studies relevant to indoor air chemistry. Collection efficiencies determined for a filter wipe method were similar to 64%, and the overall detection limit for monoalkenes was similar to 10 nmol m(-2). On average, painted walls and glass windows sampled across the University of Colorado Boulder campus were coated by similar to 4 nm thick films containing similar to 20% alkenes, and a simple calculation indicates that the lifetime for these alkenes due to reaction with O-3 is similar to 1 hour, indicating that the films are highly dynamic. Measurements of alkenes in films of skin oil, pan-fried cooking oils, a terpene-containing cleaner, and on various surfaces in a closed classroom overnight (where carboxyl groups were also measured) provided insight into the effects of chemical and physical processes on film and air composition.
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