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.
出处
《中国环境科学》
CSSCI
CSCD
北大核心
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
关键词
绿草定
土壤
腐殖酸
吸附
光解
环境化学
triclopyr
adsorption on soil
humic acids
clay minerals
photolysis.
