超声波－蒸汽蒸馏萃取技术富集沉积物样品中的氯代农药和多氯联苯  

Gas Chromatographic Determination of Chlorinated Pesticides and Polychlorinated Biphenyls in Sediment Using Ultrasonic Extraction and Steam Distillation Extraction(SDE)

作　　者：邹世春[1] 张展霞[1] 盛国英[1] 闵育顺 傅家谟 

机构地区：[1]中山大学化学系,广东省环境资源利用与保护重点实验室

出　　处：《环境科学》1996年第4期67-70,共4页Environmental Science

基　　金：中科院有机地球化学国家重点实验室基金

摘　　要：为方便快速分离沉积物中含氯农药和多氯联苯，将超声波技术和蒸汽蒸馏萃取技术相结合，萃取沉积物中的微量含氯农药和多氯联苯，所得萃取物不需进一步的净化和浓缩，可直接用于色谱分析．实验表明，在进行蒸汽蒸馏萃取之前，使用辅助的超声波技术可将大部分待测物的回收率提高２０％－３０％，较好地解决了由于沉积物的吸附作用而导致的蒸汽蒸馏萃取回收率偏低的缺陷．该法使沉积物样品中的氯代农药和多氯联苯的蒸汽蒸馏萃取富集成为可能．This paper described a new method for the extraction of trace organochlorinated pesticides(OCPs) and polychlorinated biphenyls(PCBs) in sediments using a combined technique of ultrasonic extraction(UE) with steam distillation extraction(SDE).The sediment sample was blended with water or n-he-cane prior to the SDE step and the high recoveries for DDTs and PCBs,especially for PCBs, could be obtained by an auxiliary UE method.However,the recoveries for BHCs in sediment are unsatisfactory.Further experiments showed that the recoveries for β-,γ-BHC could be enhanced when a small amount of nhexcane was mixed with the sediment sample and was treated with the UE prior to the SDE step.It is possible that this combined technique is used in the extraction for semi-volatile compounds in other solid samples.

关 键 词：超声波 蒸汽蒸馏萃取 氯代农药和多氯联苯 富集 

分 类 号：X592.02[环境科学与工程—环境工程]