文献类型：期刊文献

英文题名：Controlled release and retarded leaching of pesticides by encapsulating in carboxymethyl chitosan /bentonite composite gel

作者：Li, Jianfa[1];Yao, Jian[1];Li, Yimin[1];Shao, Ying[1]

机构：[1]Shaoxing Univ, Dept Chem, Shaoxing 312000, Zhejiang, Peoples R China

年份：2012

卷号：47

期号：8

起止页码：795

外文期刊名：JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES

收录：SCI-EXPANDED(收录号：WOS:000304308600004)、、EI(收录号：20122215075662)、Scopus(收录号：2-s2.0-84861512917)、WOS

基金：Funding was provided by the National Natural Science Foundation of China (21047005), Research Project for Public Welfare (2010C32086) & Natural Science Foundation (Y5080308) of Zhejiang Province, China.

语种：英文

外文关键词：Pesticide; controlled release; leaching; chitosan; clay

外文摘要：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.