铜对两种农药在砂土上吸附的影响  

Effect of Copper Ions on Sorption Behavior of Pesticides on Sandy Soil

作　　者：刘廷凤[1,2] 陈成[1] 王涛[1] 孙成[1] 

机构地区：[1]南京大学环境学院污染控制与资源化研究国家重点实验室,江苏南京210093 [2]南京工程学院环境工程系,江苏南京211167

出　　处：《环境科学与技术》2010年第2期19-22,共4页Environmental Science & Technology

基　　金：国家自然科学基金(20677025);南京工程学院科研启动基金(KXJ08019)

摘　　要：为了考察了铜与有机农药在土壤中吸附行为的交互作用,以阿特拉津(Atrazine,AT)、氰戊菊酯(Fenvalerate,Fen)为研究对象,进行批量平衡吸附实验。实验结果表明,AT的吸附符合线性吸附等温线,氰戊菊酯在土壤上的吸附变异性较大,可能原因是菊酯农药存在一定程度的降解。铜离子的存在使AT的吸附常数Koc由262.3减小为55.22L/kg,AT在土壤上的吸附量减小。氰戊菊酯吸附常数Koc为282.9(L/kg),铜离子与氰戊菊酯共存时,氰戊菊酯吸附Koc值增加为440.1L/kg,实验Cu2+浓度范围内,吸附量明显增加。两种农药土壤吸附实验结果不同,这种差异性可能是由于两种农药具有不同的水溶性和辛醇-水分配系数(Kow)值,铜与AT可能形成可溶性络合物从而减小其吸附。铜与氰戊菊酯可能形成不溶性络合物而使溶剂萃取率降低。Batch experiments were conducted with two pesticides, Atrazine （AT） and Fenvalerate （Fen）, to study the interaction of copper ions （Cu^2＋） and the co-existing pesticides adsorbed in sandy soil. Result of the lab-scale experiment showed that adsorption behavior of different pesticides varied, i.e., AT fit well with linear isotherm while Fen did no. The presence of Cu^2＋ reduced Koc of AT from 262.3 to 55.22 L/kg thus cutting down adsorption amount of AT onto soil; The presence of Cu^2＋ increased Koc of Fen from 282.9 to 440.1 L/kg thus raising adsorption amount of Fen onto soil. The finding regarding the different behavior implicated the different solubility and octanol/water partition （Kow） between AT and Fen and the different complexes of Cu-AT and Cu-Fen formed, which varied in their solubility in water.

关 键 词：铜 阿特拉津 氰戊菊酯 吸附 络合 

分 类 号：X131.3[环境科学与工程—环境科学]