新农药环境化学行为研究──除草剂绿草定（Triclopyr）在土壤－水环境中的吸附和光解  

Environmental behaviour of pesticide──adsorption and photolysis of the herbicide triclopyr in soil-water environment

作　　者：刘维屏[1,2] 王琪全[1,2] 方卓 

机构地区：[1]浙江大学化学系 [2]浙江省工业环保设计所

出　　处：《中国环境科学》1995年第4期311-315,共5页China Environmental Science

基　　金：浙江省自然科学基金;国家教委留学回国人员基金

摘　　要：研究土壤、腐殖酸、粘土矿对绿草定的吸附及溶液中的光降解的结果表明：吸附强弱与土壤理化特性密切相关，Ｆｒｅｕｎｄｌｉｃｈ常数ｋｆ与（３·ＯＭ％＋Ｃｌａｙ％）ｐＨ￣３有较好的相关性（ｒ＝０．９９７）；腐殖酸较粘土矿的吸附容量大；绿草定在土壤中的吸附可能有离子键、氢键、配位键及偶极－偶极作用等。太阳光中小于３３０ｎｍ波长的光对降解有效，波长２５４ｎｍ的光对绿草定的降解作用是波长３００ｎｍ光的３．５倍。We studied the adsorption and photolysis of herbicide triclopyr in the soil-water environment.Adsorption was found to be better correlated with organic matter,clay minerals and pH;the Freundlich constant k_f= 47.58×(3.OM% +Clay% )/pH￣3-103.12(γ=0.997).The interaction mechanisms between triclopyr and soil components were discussed,including ionic bonding,hydrogen bonding,covalent bonding et al.The photolysis of triclopyr follows first-order kinetics and photo-reaction rate with 254 nm irradiating is more than that with 300 nm irradating.

关 键 词：绿草定 土壤 腐殖酸 吸附 光解 环境化学 

分 类 号：X132[环境科学与工程—环境科学]