Addition of Modified Bentonites in Polymer Gel Formulation of 2,4-D for Its Controlled Release in Water and Soil

作者：Li Jianfa; Jiang Man; Wu Huan; Li Yimin

来源：Journal of Agricultural and Food Chemistry, 2009, 57(7): 2868-2874.

DOI：10.1021/jf803744w

• 2,4-D
• controlled release
• clay
• carboxymethylcellulose
• gel

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.

• 出版日期2009-4-8