使用衍生化和离子改性剂从土壤中超临界流体萃取2,4-二氯苯氧乙酸

Supercritical fluid extraction of 2,4-D from soils using derivatization and ionic modifiers.

作者信息

Rochette E A, Harsh J B, Hill H H

机构信息

Department of Crop and Soil Sciences, Washington State University, Pullman, Washington 99164-6420, USA.

出版信息

Talanta. 1993 Feb;40(2):147-55. doi: 10.1016/0039-9140(93)80315-i.

DOI:10.1016/0039-9140(93)80315-i

PMID:18965609

Abstract

Supercritical fluid extraction (SFE) with CO(2), a clean and rapid alternative to conventional organic solvent extraction techniques, was investigated for the extraction of 2,4-D from soils using a variety of pre-extraction soil treatments to enhance extraction recoveries. Initial experiments with silylation, ion-pairing, methyl esterification, and ionic displacement are reported. Methyl esterification and ionic displacement during SFE proved to be the most promising approaches for quantitative extraction. Although the SFE procedures were not fully optimized, comparison between SFE and a standard Soxhlet extraction method demonstrated the potential for improving analytical measurement for highly polar pesticides in soil by modifying SFE-CO(2) extraction with derivatizing reagents and ionic solutions.

摘要

超临界流体萃取（SFE）技术以二氧化碳为萃取剂，是一种清洁、快速的传统有机溶剂萃取技术替代方法。本研究采用多种土壤预萃取处理方法以提高回收率，对从土壤中萃取2,4-滴（2,4-D）进行了研究。报告了硅烷化、离子对形成、甲酯化和离子置换的初步实验。超临界流体萃取过程中的甲酯化和离子置换被证明是定量萃取最有前景的方法。尽管超临界流体萃取程序尚未完全优化，但超临界流体萃取与标准索氏提取法之间的比较表明，通过用衍生试剂和离子溶液改进超临界流体萃取-二氧化碳萃取法，有潜力改善土壤中高极性农药的分析测定。