中文摘要：

利用超临界CO2流体萃取（SFE-CO2）及气相色谱技术，建立了土壤中12种类二噁英类多氯联苯（PcBS）的分析测定方法．对SFBCO2的萃取条件进行了优化，其最佳萃取条件为：压力25MPa，温度100℃，静态萃取时间20min，动态萃取时间45min，收集溶剂丙酮，CO2流量2．5mL/min，改性剂10％（质量分数）二氯甲烷．12种PCBS的加标回收率为73．0％～129．0％，相对标准偏差（R蚰）为1．0％～10．5％．测定麦田土壤样品中12种类二噁英类多氯联苯，共检出8种PCBS，质量比为77～667pg/g，其他4种未检出．

英文摘要：

By using supercritical CO2 fluid extraction （SFE-CO2） and gas chromatography, a method was established for the determination of twelve dioxin-like polychlorinated biphenyls （PCBs） in soil. The extraction conditions were optimized. The optimized operational variables of SFE-CO2 are obtained as following：the pressure is 25 MPa, the temperatanture is 100 ℃, the static extraction time is 20 min, the dynamic extraction time is 45 min, the trapping solvent is acetone, the CO2 flow rate is 2.5 ml/min and the modifier is 10% dichloromethane. The recoveries of twelve PCBs ranges from 73.0% to 129.0% and the method precision is 1.0% - 10.5%. The contents are 77- 667 pg/g for eight PCBs in the soil sample from cornfield. The other four PCBs are undetectable.