Extraction and clean up procedures for the analysis of permethrin, cypermethrin, deltamethrin and fenvalerate in crops by GLC ‐ ECD

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Abstract
The extraction and clean up of four synthetic pyrethroids, (permethrin, cypermethrin, deltamethrin and fenvalerate) from soil and chickpea and green gram foliage, pod and grain is described. The interferences from the co‐extractives are removed by thin layer and column chromatography using different adsorbent and solvent system. Finally analysis is carried out by electron capture gas‐liquid chromatography. Pesticides from foliage and pod samples were well extracted with acetone in a waring blender while extraction was carried out in soxhlet with hexane in case of soil and grain. TLC with silica gel a adsorbent and hexane — acetone (9:1) as solvent system was the best clean up method because it gives good recovery value and has better capacity of removing co‐extractives.