Document Detail

Novel system for reducing leaching of the herbicide metribuzin using clay-gel-based formulations.
MedLine Citation:
PMID:  19053382     Owner:  NLM     Status:  MEDLINE    
Metribuzin is an herbicide widely used for weed control that has been identified as a groundwater pollutant. It contaminates the environment even when it is used according to the manufacturer's instructions. To reduce herbicide leaching and increase weed control, new controlled release formulations were developed by entrapping metribuzin within a sepiolite-gel-based matrix using two clay/herbicide proportions (0.5/0.2 and 1/0.2) (loaded at 28.6 and 16.7% a.i.) as a gel (G28, G16) or as a powder after freeze-drying (LF28, LF16). The release of metribuzin from the control released formulations into water was retarded, when compared with commercial formulation (CF) except in the case of G28. The mobility of metribuzin from control released formulations into soil columns of sandy soil was greatly diminished in comparison with CF. Most of the metribuzin applied as control released formulations (G16, LF28 and LF16) was found at a depth of 0-8 cm depth. In contrast, residues from CF and G28 along the column were almost negligible. Bioassays from these control released formulations showed high efficacy at 0-12 cm depth. The use of these novel formulations could minimize the risk of groundwater contamination while maintaining weed control for a longer period.
Celia Maqueda; Jaime Villaverde; Fátima Sopeña; Tomás Undabeytia; Esmeralda Morillo
Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  56     ISSN:  1520-5118     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-12-24     Completed Date:  2009-01-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  11941-6     Citation Subset:  IM    
Instituto de Recursos Naturales y Agrobiología de Sevilla (CSIC), Apartado 1052, 41080 Sevilla, Spain.
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MeSH Terms
Aluminum Silicates
Chemistry, Pharmaceutical / methods*
Herbicides / chemistry*
Soil Pollutants / chemistry*
Triazines / chemistry*
Water Pollutants, Chemical / chemistry
Reg. No./Substance:
0/Aluminum Silicates; 0/Herbicides; 0/Soil Pollutants; 0/Triazines; 0/Water Pollutants, Chemical; 1302-87-0/clay; 21087-64-9/metribuzin

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

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