5/28/2023 0 Comments Berkshire pro wipe 880On average, painted walls and glass windows sampled across the University of Colorado Boulder campus were coated by ~4 nm thick films containing ~20% alkenes, and a simple calculation indicates that the lifetime for these alkenes due to reaction with O 3 is ~1 hour, indicating that the films are highly dynamic. Collection efficiencies determined for a filter wipe method were ~64%, and the overall detection limit for monoalkenes was ~10 nmol m −2. 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. 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. Indoor surfaces are known to support organic films, but their thickness, composition, and variability between environments remain poorly characterized.
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