Validation of the surface sink model for sorptive interactions between VOCs and indoor materials

Abstract

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/S1352-2310(01)00223-0 Atmospheric Environment, 35, pp. 4479-4488, 2001-04-03 Validation of VALIDATION OF THE SURFACE SINK MODEL FOR SORPTIVE INTERACTIONS BETWEEN VOCS AND INDOOR MATERIALS AbstractAdsorption and desorption by indoor surface materials can have significant impacts on the level of volatile organic compounds (VOCs) indoors. The surface sink model (SSM) was developed to account for these interactions in an indoor air quality model. Two types of scale-up experiments were conducted to validate the SSM that was developed based on small-scale chamber experiments. Conflicting results were obtained from a large-scale laboratory experiment and a field test. From the large-scale laboratory experiment involving three materials and three chemicals, relatively good agreement was observed between measurements and predictions by the SSM. In contrast, the level of sorption in the field test was observed to be at least 9 times greater than was predicted by the SSM.

A comparative analysis of mathematical models for relating indoor and outdoor toxic gas concentrations in accidental releases

“…Faster adsorption was reported for new wallboard than for aged wallboard, and plush surfaces were found to increase sorption rates. This behavior with regard to plush and hard surfaces has also been reported in studies of VOC sorption on indoor surfaces Piadé , D'André s, & Sanders, 1999;Van Der Wal et al, 1998;Won, Corsi, & Rynes, 2000;Won, Sander, et al, 2001;Zhang, Zhang, Chen, & Yang, 2002). In these studies, differences among compounds in sorption rates on the same surfaces were attributed to the vapor pressure of the compounds (high adsorption for low vapor pressure) and to polarity (polar compounds adsorb more easily).…”

“…the concentration difference) to change the direction of the mass transfer. Three kind of models for describing this behavior can be found in the literature: a onesink model based on a simplification of Langmuir's theory (Bouhamra & Elkilani, 1999;Jørgensen, Bjørseth, & Malvik, 1999;Karlsson & Huber, 1996;Won, Sander, Shaw, & Corsi, 2001), a sink-diffusion model (Jørgensen et al, 2000) and a two-sink model (Singer et al, 2004). 2.1.3.1.…”

“…Thus, a mass balance for the material surface can be written as follows: Table 2 shows the values of k a and k d for some toxic substances. Values for VOCs can be found elsewhere (Bouhamra & Elkilani, 1999;Jørgensen et al, 2000;Singer et al, 2004;Van Loy, Riley, Daisey, & Nazaroff, 2001;Won, Sander, et al, 2001;Zhang et al, 2003).…”

Impact of material emissions and sorption of volatile organic compounds on indoor air quality in a low energy building: Field measurements and modeling

“…Comparisons of modeled VOC concentrations to measurements performed either in test chambers or in a test house showed significant differences. One study highlighted that the observed equilibrium coefficient for the field test was at least 9 times greater than in small‐scale experiments, potentially due to underestimation of the sorption processes for real indoor surfaces, which can differ from those measured in the laboratory. Further discrepancies attributed to sink effects were also observed in other studies in experimental houses after application of paint or wax …”

A new model for the drying of droplets containing suspended solids after shell formation

“…This effect can be captured through the incorporation of a sink diffusion term [25,60]. Assuming that the rate of sink diffusion may be modelled by the simple modelṄ…”