Abstract

MOJICA, Andrea  and  GUERRERO, Jairo A. EXTRACTION OF PESTICIDE RESIDUES IN SOIL BY ULTRASOUND ASSISTED. Rev.Colomb.Quim. [online]. 2010, vol.39, n.3, pp.371-387. ISSN 0120-2804.

A multiresidue method for determination of pesticides in soil was developed by a double extraction process with ethyl acetate and methanol assisted with ultrasound. Pesticides were determined by gas chromatography with micro-electron capture detection (μ-ECD) and nitrogen phosphorus detection (NPD). The recovery values of the most of pesticides were between 79% and 105%, at concentration levels ranging 0.09-14.60 mg/kg, except for metamidophos, monochrotophos and oxadixyl, whose values were found at rates between 43% and 64%. The detection limits were rated at 0.02 mg/kg and 1.59 mg/kg. The quantification limits were between 0.07 mg/kg and 5.25 mg/kg. Linearity and precision studies showed adequate results in the concentration range evaluated. Finally, this methodology was used to evaluate recovery percentages in five soils with different physicochemical characteristics.

Keywords : pesticides; soils; multiresidual method; validation; gas chromatography.

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