文献类型：期刊文献

中文题名：改性膨润土对乙草胺-海藻酸钙制剂释放性能的影响

英文题名：Influence of Modified Bentonites on the Release of Acetochlor from Alginate Carriers

作者：李建法[1];李益民[1];沈良燕[1];董华平[1]

机构：[1]绍兴文理学院化学系

年份：2008

期号：1

起止页码：17

中文期刊名：农药

外文期刊名：Agrochemicals

收录：CSTPCD、、北大核心2004、北大核心

基金：浙江省自然科学基金资助项目(Y506288;Y307106);绍兴市科技计划项目(2006A32004)

语种：中文

中文关键词：农药;控制释放;膨润土;海藻酸盐

外文关键词：herbicide; controlled release; bentonite; alginate

中文摘要：在海藻酸钙制剂中添加改性膨润土以延缓其对乙草胺的释放,采用50%活性成分被释放所消耗时间(t50)来评价改性膨润土对乙草胺释放速率的影响。结果表明,膨润土经改性后吸附能力显著提高,加入海藻酸钙制剂中使乙草胺释放速率明显下降,t50值由纯海藻酸盐制剂FA20的38.4h分别延长到羟基铁柱撑膨润土复合制剂FF24的85.7h、酸活化膨润土复合制剂FS24的102.4h和羟基铝柱撑膨润土复合制剂FL24的108.5h,相对提高两倍以上。根据拟合方程得到复合制剂的n值(0.473～0.519)近似Fickian扩散模型(n=0.5),说明乙草胺由该制剂中的释放主要受扩散控制。

外文摘要：Modified bentonites were added into acetochlor formulations of alginate base, the time taken for 50% of the active ingredient to be released, t50, was used to evaluate the influence of various bentonites on the release rate of acetochlor. According to the research results, the sorption capacities of bentonites were greatly improved through modification. The release of acetochlor was apparently slowed by addition of these modified bentonites into alginate- based formulations. The t50 values of acetochlor release were improved by more than two times from the 38.4 h for pure alginate-based FA20 formulation to the 85.7 h for compound FF24 formulation based on iron-hydroxide pillared bentonite, to the 102.4 h for compound FS24 formulation based on acid-activated bentonite and to the 108.5 h for compound FL formulation based on aluminum-hydroxide pillared bentonite. According to the fitting equation, the n values for the compound formulations （0.473-0.519） were close to 0.5 of Fickian diffusion model, which indicates that the release of acetochlor from these formulations is controlled by diffusion mechanism.