Transport of polar and non-polar volatile compounds in polystyrene foam and oriented strand board |
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| Institution: | 1. Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA, USA;2. Indoor Environment Department, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;1. UFZ Department of Effect-Directed Analysis, Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318 Leipzig, Germany;2. Institute for Organic Chemistry, Technical University Bergakademie Freiberg, Leipziger Str. 29, 09596 Freiberg, Germany;3. UFZ Department of Ecological Chemistry, Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318 Leipzig, Germany;1. Department of Medicine, National University Hospital, Singapore;2. Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore;3. Department of Statistics and Applied Probability, Faculty of Science, National University of Singapore, Singapore;4. Department of Pathology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore;1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea;2. School of Chemical Engineering and SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University, Suwon 440-746, Republic of Korea;3. Department of Semiconductor Science and Technology, Chonbuk National University, Jeonju 561-756, Republic of Korea;4. Electrical, Computer and Systems Engineering Department, Rensselaer Polytechnic Institute, Troy, NY 12180, USA;1. Department of Chemistry, Faculty of Science, University of Kragujevac, Radoja Domanovića 12, 34000 Kragujevac, Serbia;2. Faculty of Medical Sciences, University of Kragujevac, Svetozara Markovića 69, 34000 Kragujevac, Serbia;3. Department of Biology and Ecology, Faculty of Science, University of Kragujevac, Radoja Domanovića 12, 34000 Kragujevac, Serbia;4. Faculty of Chemistry, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia |
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| Abstract: | Transport of hexanal and styrene in polystyrene foam (PSF) and oriented strand board (OSB) was characterized. A microbalance was used to measure sorption/desorption kinetics and equilibrium data. While styrene transport in PSF can be described by Fickian diffusion with a symmetrical and reversible sorption/desorption process, hexanal transport in both PSF and OSB exhibited significant hysteresis, with desorption being much slower than sorption. A porous media diffusion model that assumes instantaneous local equilibrium governed by a nonlinear Freundlich isotherm was found to explain the hysteresis in hexanal transport. A new nonlinear sorption and porous diffusion emissions model was, therefore, developed and partially validated using independent chamber data. The results were also compared to the more conventional linear Fickian-diffusion emissions model. While the linear emissions model predicts styrene emissions from PSF with reasonable accuracy, it substantially underestimates the rate of hexanal emissions from OSB. Although further research and more rigorous validation is needed, the new nonlinear emissions model holds promise for predicting emissions of polar VOCs such as hexanal from porous building materials. |
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