Desarrollo y validación de un método ambientalmente amigable para la determinación de carbofurano en suelos

Abstract

In this study, an environmentally friendly analytical method was developed and validated for the extraction and quantification of N-methylcarbamate carbofuran in soil samples taken from orchards cultivated with a local potato variety. The extraction was carried out with a Matrix solid-phase Dispersion (mspd) technique. Gas chromatography with micro electron capture detector (μ-ecd) was used for the quantifi-cation of carbofuran residues in the samples, using the external standard method. Results obtained from this method were then compared with the Soxhlet technique used for samples contaminated with the commercial product Furadan® 3SC. Different parameters affecting the mspd extraction process were evaluated, such as the stationary phase, the solvent and elution volume in soil samples trea-ted with Furadan® 3SC to a final concentration of 50 mg/kg-1 of active ingredient (carbofuran). The recovery rate was used as a response variable. The best carbofuran extraction conditions for these matrices were obtained with 0.2 g of macerated sample with 0.8 g of silica gel as adsorbent in a 1:4 sample/adsorbent ratio. Samples were extracted on a cartridge with 5 ml of hexane-acetone at a 8:2 ratio as an elution solvent. The proposed method allowed to determine trace levels of carbofuran in soil samples with recovery rates of 96.58 %.