Magnetic Carbon as an Adsorbent for the Enrichment of Carbamate Pesticides in Magnetic Solid Phase Extraction Prior to High Performance Liquid Chromatography

A simple one-step synthesis method was proposed to prepare magnetic carbon material, which were subsequently employed for the magnetic solid phase extraction of carbamate pesticides prior to their determination by high performance liquid chromatography. The optimized condition resulted in the efficient extraction of a 30-mL sample solution using 50 mg of magnetic carbon as a sorbent, a 2-min vortex loading time and 1000 μL of acetone as an elution solvent with a 3-min vortex elution. The linear range of the proposed method was 5-200 μg L-1, with limits of detection and quantitation in the ranges of 3-40 and 5-60 μg L-1, respectively. The relative standard deviations were <9.5%, which indicated a high level of precision. The results suggested that the proposed magnetic solid phase extraction method was an effective enrichment procedure and could be effectively implemented for the determination of carbamate pesticides in fruit samples. Satisfactory recoveries in the range of 70.2%-120.0% were obtained with the relative standard deviations of <11.6%. The method provided the benefit of a rapid extraction process, and the magnetic carbon functioned as an eco-friendly adsorbent that could be prepared in an easy manner.