A magnetic starch modified with 3,5-diaminobenzoic acid and 3aminopropyltriethoxysilane (Fe-starch@DABA-APTES) was synthesized and applied as adsorbent for extraction of organochlorine pesticides (OCPs). The magnetic solid-phase extraction was developed using 75 mg of the sorbent and 15 mL sample solution. Extraction was conducted on a vortex mixer for 40 s. The adsorbent was collected using an external magnet before eluting the analytes using 0.5 mL methanol. Quantification of the analytes was performed using gas chromatography with micro-electron capture detector. Linearity was obtained for the studied OCPs in the range between 0.01-2.00 g L -1 . The detection and quantification limits were obtained in the ranges of 0.5-4.0 and 1.5-15.0 ng L -1 , respectively, with the enrichment factors of up to 39.The precision in terms of intra-and inter-day relative standard deviations (RSDs) were below 4.75%, and 9.25%, respectively. The developed method has been applied in natural water and agricultural product samples. The recoveries ranged between 59.83-132.67% (RSDs<10.73%).
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