Sediment-associatedpesticidesinanurbanstreaminGuangzhou,China:Implicationofashiftinpesticideusepatterns

摘要：

　　Pesticide use pattems in China have changed in recent years;however,the study of the environmental fate of current-use pesticides (CUPs) and their ecotoxicological significance in aquatic ecosystems is limited.In the current study,sediments were collected from an urban stream in the Chinese city of Guangzhou.Sediment-associated legacy organochlorine pesticides and CUPs,including organophosphates,pyrethroids,fipronil and abamectin were analyzed.Additionally,the relative toxicity of the sediments was evaluated with 10-d bioassays using Chironomus dihutus.Fifteen of 16 sediments collected from the stream were acutely toxic to C.dilutus with 81% of the samples causing 100% mortality.Abamectin,fipronil and pyrethroids (mainly cypermethrin) were identified as the principal contributors to the noted toxicity in the midges,with median predicted toxic units of 1.63,1.63,and 1.03,respectively.Sediments taken from downstream sites,where residential and industrial regions were located,had elevated CUP concentrations and sediment toxicity compared to upstream sites.This is the first study of its kind to link sediment CUPs,fipronil and abamectin concentrations,with toxicity in urban streams in China with a focus on shifting pesticide usage pattems.

关键词： Fipronil Abamectin Pyrethroids Urban stream Sediment toxicity

作者: Huizhen Li Baoquan Sun Michael J.Lvdy Jing You

作者单位: State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Fisheries and Illinois Aquaculture Center and Department of Zoology,171 Life Science Ⅱ,Southern Illi State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of

会议类型: 国内会议

会议名称: 第十一届全国博士生学术年会专题——节能环保与污染防治技术分会场论坛

会议地点: 成都

会议语种:英文

页码: 163-175

在线出版日期: 2013-10-01（万方平台首次上网日期，不代表论文的发表时间）