Enhanced toxicity of atrazine to Daphnia magna in the presence of nano-CeO_2  

作　　者：HAN Zhaoxiang LI Jiaying BAO Wei WANG Jiahong 

机构地区：[1]School of Chemical Engineering,Huaihai Institute of Technology,Lianyungang 222005,China [2]Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection,Yancheng 224002,China [3]Department of Chemistry and Applied Chemistry,Changji University,Changji 831100,China [4]School of the Environment,Nanjiing University,Nanjiing 210008,China

出　　处：《Chinese Journal Of Geochemistry》2012年第3期297-302,共6页中国地球化学学报

基　　金：supported by Chongqing Key Laboratory of Micro/Nano Materials Engineering and Technology (No. KFJJ1106);Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection (No.JLCBE11004);Jiangsu Marine Resources Development Research Institute (No. JSIMR10E04)

摘　　要：In this study,aquatic toxic effect of atrazine,and nano-CeO2,the accumulation,reproduction and adsorp-tion of atrazine onto nano-CeO2 and the facilitated transport of atrazine into D.magna by nano-CeO2 were exam-ined.The results showed that atrazine concentrations of 3.0,4.0,and 10.0 mg/L exhibited 43%,56%,68% mortali-ties,respectively,which indicated the mortality was 56% while the concentration of nano-CeO2 was 4.0 mg/L.D.magna accumulated considerably more atrazine when exposed to atrazine-contaminated water in the presence of nano-CeO2.At the same time,atrazine and nano-CeO2 yielded a significant reduction of the reproduction rate at all concentrations tested.What is more,the co-exposure of nano-CeO2 and atrazine was observed to significantly de-crease the reproduction rate of D.magna,and atrazine adsorbed on nano-CeO2 quickly.Therefore,attention should be paid to their associations with other contaminants for the risk assessment of nano-CeO2 and it is worthy of notice that the sorption of atrazine on nano-CeO2 would enhance the toxicity of atrazine to D.magna.In this study,aquatic toxic effect of atrazine,and nano-CeO2,the accumulation,reproduction and adsorp-tion of atrazine onto nano-CeO2 and the facilitated transport of atrazine into D.magna by nano-CeO2 were exam-ined.The results showed that atrazine concentrations of 3.0,4.0,and 10.0 mg/L exhibited 43%,56%,68% mortali-ties,respectively,which indicated the mortality was 56% while the concentration of nano-CeO2 was 4.0 mg/L.D.magna accumulated considerably more atrazine when exposed to atrazine-contaminated water in the presence of nano-CeO2.At the same time,atrazine and nano-CeO2 yielded a significant reduction of the reproduction rate at all concentrations tested.What is more,the co-exposure of nano-CeO2 and atrazine was observed to significantly de-crease the reproduction rate of D.magna,and atrazine adsorbed on nano-CeO2 quickly.Therefore,attention should be paid to their associations with other contaminants for the risk assessment of nano-CeO2 and it is worthy of notice that the sorption of atrazine on nano-CeO2 would enhance the toxicity of atrazine to D.magna.

关 键 词：纳米氧化铈 阿特拉津 毒性作用 大型蚤 纳米CEO2 水生生物 莠去津 风险评估 

分 类 号：X592[环境科学与工程—环境工程] TB383[一般工业技术—材料科学与工程]