期刊
出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/03601234.2012.676421
关键词
Pesticide; controlled release; leaching; chitosan; clay
资金
- National Natural Science Foundation of China [21047005]
- Research Project for Public Welfare [2010C32086]
- Natural Science Foundation of Zhejiang Province, China [Y5080308]
A novel composite gel composed of carboxymethyl-chitosan (CM-chit) and bentonite (H-bent) was used as the carrier for encapsulating atrazine and imidacloprid to control their release in water and retard their leaching in soil. Strong interactions between CM-chit and H-bent in the composite were confirmed by FT-IR, and good dispersion of pesticides in the carrier was observed by SEM. According to the results of release experiments in water, the CM-chit/H-bent composite carrier showed double advantages of both encapsulation by the polymer and sorption by the bentonite. The time taken for 50 % of active ingredients to be released, t(50), was prolonged to 572 h for atrazine and 24 h for imidacloprid, respectively. The difference between the two pesticides on release behavior was related to their hydrophobicity and water solubility. Leaching experiments through a soil layer showed that this novel carrier reduced the amount of pesticides available for leaching, and would be useful for diminishing the environmental pollution of pesticides.
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