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. On 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. The multilayer construction produces a soft material that won’t scratch or abrade even the most sensitive parts. 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. Pro-Wipe 880 - Cleanroom Supplies Berkshire UK Pro-Wipe 880 Pro-Wipe 880 is ideal for cleaning areas in which acids and solvents are a concern. Indoor surfaces are known to support organic films, but their thickness, composition, and variability between environments remain poorly characterized.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |