除草剂草甘膦在土壤中的吸附行为  

Adsorption Behaviors of Herbicide Glyphoste on Soils

作　　者：杨宏伟[1] 郭博书[1] 嘎尔迪[1] 

机构地区：[1]内蒙古师范大学化学系,呼和浩特010022

出　　处：《环境科学》2004年第5期158-162,共5页Environmental Science

基　　金：内蒙古高等学校自然科学基金资助项目 (ZD9915 2 ) ;内蒙古自然科学基金资助项目 ( 2 0 0 0 13 0 1)

摘　　要：研究了除草剂草甘膦在 3种土壤中的吸附行为 ,观察了pH和离子强度等因素对吸附的影响 .结果表明 :草甘膦在 3种土壤中的吸附过程均符合一级动力学规律 ,吸附等温线均为直线 ,吸附常数Kd2 2 2 0 7～ 3 5 2 80mL/ g ;随着离子强度的降低 ,草甘膦在 3种土壤中的吸附量明显增大 ;随着pH(9～ 3)逐渐减小 ,草甘膦在呼和浩特特市土壤和东胜土壤中的吸附量增大 ,在杭锦 2号土中的吸附量先增大 ,在 pH =7时达到最大值 ,pH =5时开始下降 ,下降到 4时的吸附量与 pH =9时的相等 .The adsorption behaviors of herbicide glyphoste on three soils were studied. The influence of pH value and ion strength on adsorption was discussed. It was shown that the adsorption dynamic process of glyphoste on three soils all was first order reaction, and the adsorption isotherms all were linear, adsorption coefficients K d ranged from 2 2207～3 5280mL·g -1 . The adsoption percentage of glyphoste on three soils increased with the ionic strength decrease . The adsoption percentage of glyphoste on the Huhhot soil and Dongsheng soil increased with pH value gradually decrease(9～3), and the adsoption percentageon of the Hangjing 2 soil early increased and late decreased with pH value gradually decrease(9～3).

关 键 词：除草剂 草甘膦 土壤 吸附 

分 类 号：X53[环境科学与工程—环境工程]