Diffusion de composés phénoliques dans des films en polyéthylène
| Autor: | Mendes, M., Touze Foltz, N., Gardoni, M., Mazéas, L. |
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| Přispěvatelé: | Hydrosystèmes et Bioprocédés (UR HBAN), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Departamento de Ciência da Computação [Minas Gerais] (DCC - UFMG), Universidade Federal de Minas Gerais [Belo Horizonte] (UFMG), Hydrosystèmes et bioprocédés (UR HBAN) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Geosynthetics International Geosynthetics International, Thomas Telford, 2014, 21 (2), pp.137-150. ⟨10.1680/gein.14.00005⟩ |
| ISSN: | 1072-6349 |
| Popis: | International audience; This paper presents experimental results of the diffusion of phenolic compounds through virgin and aged polyethylene (PE) films. The study considers five chlorophenols contaminants (4-chlorophenol, 2,4-dichlorophenol, 2,4,6-tricholophenol, 2,3,5,6-tetrachlorophenol, and pentachlorophenol) that are known to be toxic even at very low concentrations. The concentration dynamics in the source and receptor chambers of the diffusion cells is interpreted using the numerical code Pollute. For virgin PE film, partition coefficients ranged from 0.68 to 278, which corresponded to 4-chlorophenol and pentachlorophenol, respectively. Diffusion coefficients ranged from 1.0 3 1014 to 2.7 3 1013 m2/s, which corresponded to pentachlorophenol and 2,4-dichlorophenol, respectively. The study also looked at how the partition and diffusion coefficients were affected by the aqueous solubility, n-octanol-water partition coefficient, molecular diameter, and molecular weight. The trends observed in this study are similar to those found for diffusion of phenolic compounds through PE geomembranes. The results also revealed trends that differ from those previously reported for diffusion of volatile organic compounds (VOCs) through geomembranes. The existing empirical relationships for VOCs are not applicable except for calculating how the diffusion coefficient evolves as a function of solubility in water. Increasing the number of chlorine atoms on the phenolic nucleus causes an increase in the partition coefficient, which is tentatively attributed to the polarity of the molecules under study. |
| Databáze: | OpenAIRE |
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