Mechanisms affecting the dissolution of nonaqueous phase liquids into the aqueous phase in slow-stirring batch systems.

Détails

ID Serval
serval:BIB_FB28E7959027
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Mechanisms affecting the dissolution of nonaqueous phase liquids into the aqueous phase in slow-stirring batch systems.
Périodique
Environmental Toxicology and Chemistry / SETAC
Auteur(s)
Schluep M., Imboden D.M., Gälli R., Zeyer J.
ISSN
0730-7268
Statut éditorial
Publié
Date de publication
03/2001
Peer-reviewed
Oui
Volume
20
Numéro
3
Pages
459-466
Langue
anglais
Notes
Publication types: Journal Article
Résumé
Understanding the kinetics of the exchange processes between nonaqueous phase liquids (NAPLs) and water is important in predicting the fate of anthropogenic compounds such as petroleum hydrocarbons, i.e., benzene, toluene, ethylbenzene, and xylene (BTEX) as well as polynuclear aromatic hydrocarbons (PAHs). Exchange processes occurring in the environment resemble the experimental setup of the slow-stirring method (SSM) designed to determine solubilities and octanol-water partition coefficients. Data obtained from SSM experiments for diesel fuel compounds are interpreted by a linear transfer model that is characterized by an aqueous molecular boundary layer and the water/NAPL equilibrium partition coefficient. For the chosen experimental setup, the boundary layer thickness is 2.42 x 10(-2) cm. Typical equilibration times lie between 1 and 2 d. Due to the temperature dependence of the aqueous diffusivity, this time increases with decreasing temperature. Transport within the NAPL phase can slow down the exchange process for the more water-soluble compounds (e.g., benzene) provided that the stirring rate exceeds a critical value.
Mots-clé
Alkanes/chemistry, Gasoline, Least-Squares Analysis, Linear Models, Models, Chemical, Organic Chemicals/chemistry, Polycyclic Hydrocarbons, Aromatic, Solubility, Water/chemistry, Water Pollutants, Chemical
Pubmed
Web of science
Création de la notice
25/01/2008 12:46
Dernière modification de la notice
20/08/2019 16:26
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