Diffusion studies of VOC mixtures in a building material.
Volatile organic compound (VOC) adsorption by indoor materials will reduce peak concentrations, and subsequent desorption will prolong the presence of a compound indoors. Diffusion within materials plays an important role in this context. The purpose of this paper is to present two experimental set-ups to study VOC diffusion, and to show corresponding experimental results. The Field and Laboratory Emission Cell (FLEC) is in both cases an integral part of the set-up. The mass flow of VOC mixtures across gypsum board is studied. Diffusion of less polar VOCs in gypsum board can be fast (diffusion coefficients of 0.001-0.003 m2/h). Diffusion coefficients of chlorinated compounds are correlated with boiling points and molecular areas. Different compounds show similar diffusion properties.
Meininghaus
R
R
Air Quality Unit, Environment Institute, Joint Research Center, Italy.
Uhde
E
E
D000327:Adsorption; D000392:Air Movements; D016902:Air Pollution, Indoor / Q000032:analysis*; D003252:Construction Materials; D004058:Diffusion; D009930:Organic Chemicals / Q000032:analysis; D014835:Volatilization
D009930:Organic Chemicals