海洋沉积物中痕量BHC、DDT的测定——汽相提取法及其机理

THE DETERMINATION OF TRACE BHC AND DDT IN MARINE SEDIMENTS——LIQUID PHASE EXTRACTION AND THE EXPLORATION OF ITS MECHANISM

环境沉积物和土壤中有机氯农药BHC(666)、DDT(滴滴涕)含量的测定,目前主要采用振荡提取法,索氏提取法,消煮提取法和柱提取法等。这些方法都是利用有机溶剂与沉积物样品直接接触,进行固-液分配而提取农药的。这样,只要能溶解在有机溶剂中的沉积有机物质,都可能被有机溶剂提取出来.

A liquid extraction method,different from the current extraction me-thods based on solid-liquid partition,is used to extract trace BHC and DDTfrom marine sediments.In this method,ample doesn’t contact directly withthe organic solvents used for the extraction.Since BHC and DDT display,after vapourization,large'specific surface area'of gas-liquid,liquid-liquidpartitioning,in the non-hcmogenous system,trace EHC and EDT were ex-tracted indirectly from sediments,greatly reduced the interferences of organicmatters in the sediments on the determination and simplifying the stepsof extraction and purification.In comparision with other methods,this methodis sensitive,rapid,simple and convinient.The extraction process and mechanism which involves several complexinterfacial physico-chemical processes have also been preliminarily discussedin the paper.