Supercritical Fluid Extraction of Sulfonylurea Herbicides in Soil Samples

摘要

The application of supercritical fluid extraction (SFE) with supercritical CO2to the analysis of 2 sulfonylurea herbicides in 4 soils is presented. Methanol and water are added to the soil samples as modifiers. After extraction, Chlorsulfuron and Metsulfuron methyl are measured by HPLC-UV at 220 nm. The recovery rates are good (80) for all types of the studied soils except for those with high organic carbon content (ca. 50). According to the characteristics of the soils, recovery with SFE is similar or better than with liquid-solid extraction.