Please use this identifier to cite or link to this item:
Title: Sorption, diffusion, and desorption of alachlor in oxidized and reduced smectite membranes
Authors: Kocherginsky, N.M. 
Stucki, J.W.
Issue Date: 1-Sep-2000
Citation: Kocherginsky, N.M., Stucki, J.W. (2000-09-01). Sorption, diffusion, and desorption of alachlor in oxidized and reduced smectite membranes. Environmental Science and Technology 34 (17) : 3574-3578. ScholarBank@NUS Repository.
Abstract: The fate of pesticides in the environment depends to a large extent on their interactions with clay mineral surfaces in soils and sediments. Most studies of these interactions typically employ batch suspension methods. Another method, which may be much faster and simpler, is to cast the clay into the form of a self-supporting film immobilized between two porous nitrocellulose filters. The objective of this study was to investigate the kinetics of alachlor transport through such a membrane. We found that at least two kinetic phases (rapid and slow) exist. Herbicide disappearance from donor solutions, its appearance in acceptor solutions (including time lag and the rate at steady state), and its retention by the membrane revealed that adsorption on the clay surface plays a prominent role in transmembrane transport processes. The oxidation state of structural Fe in the clay film changed the surface chemical properties of the clay and modified both the fast adsorption and slow transport of alachlor through the membrane. Transport through the reduced clay was accompanied by chemical alterations of alachlor. No chemical alterations were observed if the clay film was in its oxidized state.
Source Title: Environmental Science and Technology
ISSN: 0013936X
DOI: 10.1021/es980873h
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Jun 29, 2020


checked on Jun 29, 2020

Page view(s)

checked on Jun 28, 2020

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.