Abstract
Abstract A simple and inexpensive home‐made supercritical fluid extraction (SFE) apparatus is described. Using conventional solvents of different polarity and solvent strength as supercritical fluids, extractions of fenitrothion and aminocarb residues from forest soil and conifer foliage were conducted. Analysis of the extracts was done by capillary gas chromatography (GC) after necessary partition and cleanup steps. Experiments were carried out to study the effects of pressure, temperature, flow rate, sample size, analyte concentration and matrix type on extraction efficiencies. The recovery data are presented and compared with the results obtained from Sorvalf® extraction. Sorvall extraction of the pesticides from the two matrices using ethyl acetate, methanol and acetonitrile gave quantitative recoveries and were > 93 %. However, the recoveries using hexane were less quantitative and averaged only about 76 %. Methanol and acetonitrile functioned well as extractants in SFE and the recoveries were > 94 %...
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