期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 57, 期 7, 页码 2868-2874出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf803744w
关键词
2,4-D; controlled release; clay; carboxymethylcellulose; gel
资金
- Natural Science Foundation of Zhejiang Province, China [Y307106]
Carboxymethylcellulose (CIVIC) gel was used for encapsulating anionic herbicide 2,4-D for its controlled release. The slower release rate of 2,4-D in water and soil was obtained by adding in the gel formulation some modified bentonites, which were prepared by intercalating inorganic or organic cations in interlayers of Na+-saturated bentonite. The higher encapsulation efficiencies of 2,4-D were observed on the bentonite/CMC gel formulations due to the sorption of 2,4-D on modified bentonites. The time taken for 50% of 2,4-D to be released in water, t(50), showed a variation (8.8-19.8 h) for these gel formulations, the largest value corresponding to the formulation incorporated with hydroxy-iron intercalated bentonite that has the highest sorption capacity to 2,4-D. The gel formulations could also control the release of 2,4-D when applied to a thin soil layer and demonstrated potential to reduce leaching of such anionic herbicides in soil.
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