Comparison of supercritical fluid extraction(SFE), soxhlet and shaking methods for pendimethalin, extraction from soils: effect of soil properties and water content

摘要

Supercritical fluid extraction with CO_2 was applied to the analysis of traces of pendimethalin, a herbicide of the dinitroanilines group, in four different natural soils. The Supercritical Fluid Extraction(SFE)method was compared with the classical Soxhlet and shaking methods in terms Of ease to run, extraction efficiency, selectivity and reproducibility. The influence of the Physico-chemical properties of the soil matrix on herbicide extraction was then evaluated with the SFE method. The supercritical fluid extraction system used in the present study was found to be Much easier to run than the other two methods, less time consuming and requires fewer operations As it was optimized for on-line sample clean up.