Determination of a-cyhalothrin in palm and palm kernel oils using tandem solid-phase extraction cartridges

This article outlines a nezv method based on low-temperature fat precipitation extraction zvith acetonitrile and graphitised carbon black/primary secondary amine (gcb/psa) solid-phase extraction clean-up for the extraction of λ-cyhalothrin residue in both crude palm oil (cpo) and ci'ttde palm kernel oil (cpko). determination of λ-cyhalothrin zvas then carried out using gas chromatography (gc) equipped with an electron capture detector (ecd). analyses for λ-cyhalothrin in palm oil and palm kernel oil samples spiked with different levels ofλ-cyhalothrin (0.05,0.08,0.1,0.5,and 1.0 ig g 1) were performed. mean recoveries for six replicates ranged from 82°c to 98°0 for cpo and from 86°c to 94°c for cpko,with relative standard deviation (rsd) values of less than 1000 in most cases. the limit of detection for λ-cyhalothrin in both cpo and cpko zvas 0.05 tg g . the method was successfully applied to the analysis of λ-cyhalothrin in cpo samples obtained from local palm oil mills throughout malaysia. no λ-cyhalothrin was found in the 30 samples analysed.