Abstract

FORERO, José R.; CASTRO, Henry I.  and  GUERRERO, Jairo A.. EXTRACTION OF PESTICIDES IN SOIL USING SUPERCRITICAL CARBON DIOXIDE -CO-SOLVENTS. Rev.Colomb.Quim. [online]. 2009, vol.38, n.3, pp.425-434. ISSN 0120-2804.

In this study, three organic solvents (ethyl acetate, methanol and acetone) were used as cosolvent in supercritical fluid extraction (SFE) of a mixture of pesticides with different physical and chemical properties present in soil. These pesticides were determined by gas chromatography with electronic microcapture detector (µECD) and nitrogen-phosphorus detector (NPD), coupled in parallel. The extractions were performed on spiked soil samples using supercritical carbon dioxide (CO₂SC) as the extracting phase to 35 °C and 14 MPa, using 10 mL of each cosolvent and it was found that methanol offers the greatest efficiency in the extraction process obtaining recovery values between 51.24 and 123.50%.

Keywords : pesticides; soil; extraction; cosolvent; supercritical fluid.

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