1991 Volume 7 Issue 4 Pages 567-572
A new double-stage separation method was developed for residue analysis using direct coupling of supercritical fluid extraction (SFE) and supercritical fluid chromatography (SFC). While conventional residue analysis requires much time and labor, this new method makes it possible to extract analytes selectively with a small amount of organic solvent and to introduce them into the chromatograph without injection. In this study, the extraction of pesticide residues from soil and various plant samples was investigated. In all cases, the pesticides were successfully extracted with supercritical carbon dioxide, especially with control of their separation from co-extracts in various ways, including adjustment of the modifier. For the soil samples, the extraction behavior of each pesticide from the matrix is discussed in terms of their electronic structures.
