Abstract:

A new method was proposed to measure organochlorines and pyrethroid pesticide residues in Cotex mouta simultaneously by gas chromatography and matrix solid-phase dispersion. The recovery was used to evaluate the extraction and clean-up method, extraction conditions were optimized using orthogonal experimental design, including stuff, solvent and their dosage. Dry ground Cotex mouta samples and neutral alulllinum oXide (1:2) were homogenized in a mortar for 5 min and then packed into a 10 mL of glass column by eluting with ethyl acetate solution. The qualitative and the quantitative analysis of samples was accomplished using gas chromatography with ECD (electronic capture detector). Mean recoveries for 11 different pesticides in Cotex mouta were found in the range of 77.69%-110.7% at the spiked levels of 0.02, 0.1 and 1 mg/kg, and relative standard deviation (RSD) were all lower than 11.6%. The limits of detection (LOD) of the method ranged between 0.1-3.4 μg/kg. The proposed method could detect organochlorines and pyrethroid pesticides in Cotex mouta.