中文摘要：

氯代烃曾经广泛用作工业清洗剂,由于过度使用和储存不当,造成严重的土壤和地下水污染.本研究选取上海浦东某1,1,1-三氯乙烷（1,1,1-TCA）污染场地作为研究对象,连续5年观测了75个监测井的地下水样品氯代烃分布.采用吹扫捕集和气相色谱联用法检测了地下水样品中氯代烃的种类和浓度,运用GMS软件构建了污染场地水文地质模型和氯代烃污染羽分布图.结果表明,氯代烃污染羽主要分布在5个区域,面积达5000 m2左右,深度主要在地下4～8 m的粘土层中,污染土壤和地下水总量为50000 m3左右;2号区域的污染情况最为严重,氯代烃浓度范围为10～1700 mg·L^（-1）,发现50 m3左右的自由相（DNAPL）.研究结果将为揭示该场地污染物迁移转化规律,为后续的人体健康风险评估和制定修复方案提供数据支撑.

英文摘要：

Chlorinated hydrocarbons （CHs） as cleaning solvents in manufacturing factories widely contaminate soil and groundwater due to their extensive usage and inappropriate disposal practices. This study is focused on a site contaminated by 1,1,1-Trichloroethane （ 1,1,1-TCA ） in Pudong district, Shanghai. CHs in groundwater samples from 75 monitoring wells during 5 years were determined using purge/trap-GC system, and the hydrologic model of the site and the map of CHs plume distribution were constructed by Groundwater Modeling Software （ GMS ）. The results show that 5 plumes of contaminated groundwater covered an area about 5000 m2 with volume of 50000 m3 , located in the 4 ～ 8 m clay bed underground. The concentration of CHs in the No. 2 plume ranged from 10 to 1700 mg·L-1 , including about 50 m3 of dense non-aqueous phase liquid （DNAPL）. This study gives insight into the migration and transformation of CHs in the site.