Document Detail


Organo-clay formulation of acetochlor for reduced movement in soil.
MedLine Citation:
PMID:  11714329     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study aimed to design ecologically acceptable formulations of acetochlor by adsorbing it on montmorillonite exchanged by a small organic cation, phenyltrimethylammonium (PTMA). Adsorption of acetochlor on the clay mineral exchanged with different organic cations and its release from these complexes were determined by GC and modeled by Langmuir equation. Interactions between acetochlor molecules and the exchanged organic cation on the clay surface were studied by Fourier transform infrared spectroscopy. Leaching of acetochlor in soil was determined by a bioassay using a column technique and Setaria viridis as a test plant. The adsorbed amounts of acetochlor on montmorillonite exchanged by PTMA at a loading of 0.5 mmol/g of clay were higher than at a loading up to the cation-exchange capacity, i.e., 0.8 mmol/g, and were higher than obtained by using a clay mineral exchanged by other organic cations. Preloading montmorillonite by PTMA at 0.5 mmol/g yielded maximal shifts of the infrared peaks of the herbicide. The above formulation of acetochlor yielded slow release in water and showed improved weed control in field and greenhouse experiments in comparison with the commercial formulation. The PTMA-clay formulation of acetochlor maintained herbicidal activity in the topsoil and yielded the most significant reduction in herbicide leaching and persistence under field conditions. The application of this formulation can minimize the risk to groundwater and can reduce the applied rates.
Authors:
Y El-Nahhal; S Nir; C Serban; O Rabinovitz; B Rubin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  49     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2001 Nov 
Date Detail:
Created Date:  2001-11-20     Completed Date:  2002-01-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5364-71     Citation Subset:  IM    
Affiliation:
Seagram Center for Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, Rehovot 76100, Israel.
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MeSH Terms
Descriptor/Qualifier:
Adsorption
Aluminum Silicates / chemistry*
Herbicides / chemistry*
Soil*
Spectroscopy, Fourier Transform Infrared
Toluidines / chemistry*
Chemical
Reg. No./Substance:
0/Aluminum Silicates; 0/Herbicides; 0/Soil; 0/Toluidines; 1302-87-0/clay; 34256-82-1/acetochlor

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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