Kinetics of metribuzin release from bentonite-polymer composites in water

A series of bentonite polymer-composites (BPCs) loaded with metribuzin were studied for their controlled release in aqueous medium. The release of active ingredient from BPCs was significantly lower as compared to commercial metribuzin formulation. The results revealed that the cumulative metribuzin...

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Bibliographic Details
Published in:	Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes Vol. 49; no. 8; pp. 591 - 600
Main Authors:	Sahoo, Sonalika, Manjaiah, K.M., Datta, S.C., Ahmed Shabeer, T.P., Kumar, Jitendra
Format:	Journal Article
Language:	English
Published:	Philadelphia, PA Taylor & Francis 01-01-2014 Taylor & Francis Ltd
Subjects:	Agronomy. Soil science and plant productions Animal, plant and microbial ecology Applied ecology Aqueous solutions Bentonite Bentonite - chemistry Biological and medical sciences Chromatography, Gas Crops Fundamental and applied biological sciences. Psychology half-life Herbicides Herbicides - chemistry Ingredients Kinetics metribuzin Parasitic plants. Weeds Pest control Phytopathology. Animal pests. Plant and forest protection Polymer matrix composites polymer-composites Polymers - chemistry Triazines - chemistry Water - chemistry Water Pollutants, Chemical - chemistry Water Pollution, Chemical - prevention & control Weeds Water Triazine derivatives Pesticides Metribuzin Bentonite Environment Polymer Kinetics half-life Herbicide polymer-composites Half life metribuzin
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Summary:	A series of bentonite polymer-composites (BPCs) loaded with metribuzin were studied for their controlled release in aqueous medium. The release of active ingredient from BPCs was significantly lower as compared to commercial metribuzin formulation. The results revealed that the cumulative metribuzin release was highest (81%) from the BPCs containing 8% clay (commercial bentonite) and 2% metribuzin which correspond to the lowest (14 days) half-life values i.e., time required for 50% release of active ingredient (t 1/2 ). The metribuzin release from the BPCs decreased with increased concentration of clays in polymer matrix and the release was further decreased with BPCs prepared with pure nano-bentonite. BPCs containing 12% clay and 2% metribuzin showed maximum t 1/2 values i.e., 25 and 51 days for commercial bentonite and pure nano-bentonite as clay sources, respectively. The differential behaviour in the metribuzin release rates from BPCs was ascribed due to variations in crosslinking of metribuzin in the composites. As metribuzin release was found to be slower in BPCs compared to commercial formulation, it could be used for control of weeds tailored to different crops.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0360-1234 1532-4109
DOI:	10.1080/03601234.2014.911578