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Influence of suspended particles on indoor semi-volatile organic compounds emission
Abstract Semi-volatile organic compounds (SVOCs) have been attracting more and more attentions to many researchers in these years. Because SVOCs have a strong tendency for adsorption to suspended particles, we take the effect of suspended particles into account to study the transport mechanism of SVOCs in the air. We establish a mathematical model to describe the transport mechanism of SVOCs, and study the transport processes of both gas- and particle-phase di-2-ethylhexyl phthalate (DEHP) in Field and Laboratory Emission Cells (FLECs). The predictions by the proposed model not only fit well with the experimental data of previous studies, but also show that the gas-phase DEHP concentration increases rapidly in the first few seconds and increases slowly during the following 200 days due to different transport mechanisms in the two periods. Meanwhile, when the particle radiuses are of the order of micron and the air changes per hour (ACH) is large enough, the characteristic time for DEHP getting gas/particle equilibrium is much longer than the residence time of a particle in the flow field, and thus there is no significant influence of suspended particles on the total concentration of DEHP in the air. Oppositely, the influence of particles on DEHP emission will be enhanced for a cycling air flow system with a small ACH, where increasing ACH will reduce the concentrations of particle-phase SVOCs. Besides, if the particle radiuses are of the order of nanometer, decreasing the particle radiuses will shorter the characteristic time for DEHP getting gas/particle equilibrium, and finally increase the particle-phase concentration of DEHP.
Highlights The adsorption of suspended particles is considered for SVOCs transport in the air. SVOCs diffusion in particles can be described by the lumped parameter method. A model of SVOCs transport in the air with suspended particles is established. The gas-phase DEHP concentration increases rapidly in the first few seconds. Increasing ACH can effectively reduce the particle-phase concentration of SVOCs.
Influence of suspended particles on indoor semi-volatile organic compounds emission
Abstract Semi-volatile organic compounds (SVOCs) have been attracting more and more attentions to many researchers in these years. Because SVOCs have a strong tendency for adsorption to suspended particles, we take the effect of suspended particles into account to study the transport mechanism of SVOCs in the air. We establish a mathematical model to describe the transport mechanism of SVOCs, and study the transport processes of both gas- and particle-phase di-2-ethylhexyl phthalate (DEHP) in Field and Laboratory Emission Cells (FLECs). The predictions by the proposed model not only fit well with the experimental data of previous studies, but also show that the gas-phase DEHP concentration increases rapidly in the first few seconds and increases slowly during the following 200 days due to different transport mechanisms in the two periods. Meanwhile, when the particle radiuses are of the order of micron and the air changes per hour (ACH) is large enough, the characteristic time for DEHP getting gas/particle equilibrium is much longer than the residence time of a particle in the flow field, and thus there is no significant influence of suspended particles on the total concentration of DEHP in the air. Oppositely, the influence of particles on DEHP emission will be enhanced for a cycling air flow system with a small ACH, where increasing ACH will reduce the concentrations of particle-phase SVOCs. Besides, if the particle radiuses are of the order of nanometer, decreasing the particle radiuses will shorter the characteristic time for DEHP getting gas/particle equilibrium, and finally increase the particle-phase concentration of DEHP.
Highlights The adsorption of suspended particles is considered for SVOCs transport in the air. SVOCs diffusion in particles can be described by the lumped parameter method. A model of SVOCs transport in the air with suspended particles is established. The gas-phase DEHP concentration increases rapidly in the first few seconds. Increasing ACH can effectively reduce the particle-phase concentration of SVOCs.
Influence of suspended particles on indoor semi-volatile organic compounds emission
Hu, Kang (author) / Chen, Qun (author) / Hao, Jun-Hong (author)
Atmospheric Environment ; 79 ; 695-704
2013-07-05
10 pages
Article (Journal)
Electronic Resource
English
Understanding semi-volatile organic compounds in indoor dust
| SAGE Publications | 2022
| British Library Online Contents | 2015