【摘要】 研究了沉积物中六氯苯的超声萃取条件,并采用气相色谱进行定量分析。研究结果表明,在以10 mL可密闭耐压试管为萃取容器,6 mL丙酮∶正己烷(体积比1∶1)为萃取溶剂,超声功率90 W,萃取时间40 min,温度35~40℃,2次萃取的优化条件下,六氯苯稳定性较好。该方法的平均回收率为84.8%,相对标准偏差为1.92%(n=10),检出限为0.071μg/kg。本法与传统的索氏提取法和浸泡振荡法相比,具有萃取效率高、萃取时间短、溶剂用量小、操作简单等优点,并成功用于实际样品的测定。更多还原

【Abstract】 Ultrasonic extraction of hexachlorobenzene(HCB) from sediments was studied in this paper.HCB was determined by gas chromatography with micro-cell electronic capture detector(μ-ECD).The results showed that the stability of HCB was very good for twice ultrasonic extraction under the optimized ultrasonic conditions of 10 mL sealed test tube,6 mL acetone∶hexane(V∶V,(1∶1),)power 90 W,time 40 min and temperature 35~40℃.The average recovery of HCB from spiked sediments was(84.8%,)relative standard deviation was 1.92%(n=10),and detection limit was 0.071 μg/kg.Compared with traditional extraction methods,such as Soxhlet extraction and shake-flask extraction,ultrasonic extraction showed higher extraction efficiency,shorter time,lower solvent consumption and easy to use.The developed method was successfully applied to the determination of the HCB in real sample.更多还原