加速溶剂萃取技术(ASE)在农药残留分析中的应用

Use of accelerated solvent extraction techniques in pesticide residue analysis

加速溶剂萃取(ASE)是采用常规溶剂,在较高的温度(50℃￣200℃)和压力(1000￣3000psi或10.3￣20.6MPa)下对固体或半固体样品进行萃取的新颖的样品前处理技术,具有操作简便、省时省溶剂、减少有机溶剂对环境的污染、萃取操作自动化的特点。介绍了ASE的原理、仪器操作和影响因素,并概述了ASE在土壤、蔬菜、水果及生物样品残留农药提取中的应用,提取的农药种类有有机氯、有机磷和多种除草剂。特别是在多残留检测中,加速溶剂萃取技术更易于同时提取不同类别的多种农药,简化净化过程,并在快速检测方面发挥重要作用。加速溶剂萃取的提取效率和索氏提取相当。

Accelerated solvent extraction （ASE） is an innovative sample pretreatment technology that combines elevated temperature （50 to 200℃） and pressure （1000 to 3000 psi or 10,3 to 20.6 MPa） with liquid solvents to achieve fast and efficient extraction of solid and semi-solid samples. Compared to other methods, ASE is simple and convenient to conduct, rapid, and uses less solvent, thereby limiting environmental contamination. ASE also lends itself to automation. This article discusses the principles of ASE, operation of required instrumentation, and the effects of various factors, as well as use of ASE in analysis of residues in soil, vegetable, fruit, and biological samples of pesticides including organochlorine and organophosphorus compounds along with many types of herbicides. ASE is especially useful in simultaneous separation and cleanup of samples containing multiple pesticide residues and has an important role in rapid analysis applications. ASE extraction efficiency is equivalent to that of Soxhlet extraction.