草甘膦在水-土两相中的吸附行为研究

Adsorption behaviors of herbicide glyphosate on soil

研究了有机磷类除草剂草甘膦在4种土壤固-液相间的吸附与土壤组分作用的定量相关性.测定了草甘膦在4种土壤中的吸附等温线.观察了pH对吸附的影响.结果表明：草甘膦在4种土壤中吸附过程均符合一级动力学规律，吸附等温线符合Freundlich 平衡方程，吸附常数为25.82 ~69.07；pH 3~10范围内，随着pH的增加，草甘膦在土壤中的吸附量降低.

Adsorption isotherms of bentazon in four selected soils were measured. The adsorption behaviors of herbicide glyphosate on four kinds of soil were studied. The influence of pH value on adsorption was discussed. It was shown that the adsorption dynamic process of glyphoste on four soils all was first order reaction, and the adsorption accords the langmuir model, adsorption coeffieients Kf ranged from 25.82 to 69.07.The adsorption percentage of glyphosate decreased with pH value gradually decrease（3-10）.