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

Details

Serval ID
serval:BIB_FB28E7959027
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Mechanisms affecting the dissolution of nonaqueous phase liquids into the aqueous phase in slow-stirring batch systems.
Journal
Environmental Toxicology and Chemistry / SETAC
Author(s)
Schluep M., Imboden D.M., Gälli R., Zeyer J.
ISSN
0730-7268
Publication state
Published
Issued date
03/2001
Peer-reviewed
Oui
Volume
20
Number
3
Pages
459-466
Language
english
Notes
Publication types: Journal Article
Abstract
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.
Keywords
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
Create date
25/01/2008 12:46
Last modification date
20/08/2019 16:26
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