新疆孔雀河表层沉积物中有机氯农药的分布及风险评价  

DISTRIBUTION AND RISK ASSESSMENT OF ORGANOCHLORINE PESTICIDES IN SURFACE SEDIMENT FROM THE PEACOCK RIVER IN XINJIANG,CHINA

作　　者：陈伟[1] 宋琪[1] 刘梦[1] Ellis Burnet Julia 祁士华[1] 

机构地区：[1]中国地质大学(武汉)环境学院生物地质与环境地质教育部重点实验室,武汉430074

出　　处：《环境化学》2009年第2期289-292,共4页Environmental Chemistry

基　　金：国家自然科学基金(40473043);中国地质大学(武汉)国家大学生创新性试验计划资助项目

摘　　要：分析了新疆孔雀河9个表层沉积物样品中22种有机氯农药(OCPs)含量,其主要OCPs含量的顺序为:六六六>异狄氏剂醛>滴滴涕>艾氏剂>硫丹Ⅱ>异狄氏剂>氯丹.研究表明,近期有γ-HCH输入到孔雀河,其最可能的来源是博斯腾湖的补给或孔雀河附近的农业回流水.滴滴涕的组成特征分析表明,DDTs主要源于施用的农药在好氧环境土壤中的分解,产生DDE等主要产物.风险评价表明,污染物的风险较低,所有被评估的OCPs的风险值均小于风险评价高限(ERM).Nine sediment samples collected from the Peacock River in Xinjiang, were analyzed for twenty-two pesticides. The mean concentration order of the major OCPs was ∑HCH 〉 Endrin aldehyde 〉 ∑ DDT 〉 Aldrin 〉 Endosulfan Ⅱ 〉 Endrin 〉 ∑ chlordane （ TC ＋ CC） . The ratio of α-HCH/γ-HCH showed new input of γ-HCH （lindane） to the Peacock River. The most possible source was the water flowing from Bosten Lake and/or the agricultural tailing water that was returned directly into the Peacock River. The compositive characteristics of DDTs indicated that the DDT compounds in sediments might be derived from DDT-treated aged and weathered agricultural soils. The degradation condition for DDT was aerobic, and the main byproduct was DDE. The risk assessment for some OCPs by effects range-low and effects range-median showed that the risk was very low. All the concentrations of evaluated OCPs were below the ERM guideline values.

关 键 词：有机氯农药 沉积物 风险评价 孔雀河 

分 类 号：X132[环境科学与工程—环境科学]