Determining the permeability of organic solvents through PVC pipes using a direct SPME model |
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| Institution: | 1. Department of Occupational Safety & Health, China Medical University, Taichung, Taiwan, ROC;2. Department of Civil Engineering, Chien Hsin University of Science & Technology, Taoyuan, Taiwan, ROC;1. Dipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia, Via Branze 38, 25123 Brescia, Italy;2. Istituto per lo Studio delle Macromolecole, Consiglio Nazionale delle Ricerche, Via De Marini 6, 16149 Genova, Italy;1. Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan;2. PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan;1. Department of Chemical, Materials and Production Engineering (DICMAPI), University of Naples “Federico II”, P. le Tecchio, 80-80125, Naples, Italy;2. Centre for NanoEngineering, Departament de Màquines i Motors Tèrmics, ETSEIAT, Universitat Politècnica de Catalunya, 08222, Terrassa, Barcelona, Spain |
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| Abstract: | The permeability of aromatic hydrocarbons, i.e. BTEX and styrene, through PVC pipes was investigated using a 6-cm pipe-bottle model with direct solid-phase microextraction (SPME) sampling. It was found that an aromatic hydrocarbon with a large molecular size or low polarity may be less permeable through PVC pipes. In addition, the diffusion coefficients of BTEX and styrene in PVC pipes ranged from 4.87 to 7.64 × 10?8 cm2/s. According to the simulation results of a one-dimensional diffusion model, it is speculated that diffusion transport of benzene and toluene in PVC pipes may have non-Fickian behavior. The advantage of using the innovated test model is that SPME provides a nondestructive analytical means to monitor the concentrations of organic compounds in pipe-water. Therefore, the pipe-bottle model developed herein has potential applications in determining the resistance of polymeric pipes to permeation by solvents in the aqueous solution. |
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| Keywords: | Permeability Aromatic hydrocarbon Solid-phase microextraction (SPME) Pipe-bottle model |
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