| 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 |
| 摘要点击 618 全文点击 850 投稿时间：1995-12-11 |
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| 中文关键词 超声波 蒸汽蒸馏萃取 氯代农药和多氯联苯 富集 |
| 英文关键词 steam distillation extraction ultrasonic bath organochlorinated pesticides polychlorinated biphenyls analysis |
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| 中文摘要 |
| 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。 |
| 英文摘要 |
| 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. |
