Magnetic solid-phase extraction of triazole fungicides based on magnetic porous carbon prepared by combustion combined with solvothermal method.

A magnetic porous carbon (Fe3O4@PC) was successfully fabricated based on combustion combined with solvothermal method, and then used as magnetic solid-phase extraction absorbent for the determination of four triazole fungicides. The porous carbon was fabricated by imperfect combustion of filter paper loaded with zinc nitrate hexahydrate, which possessed extremely abundant pores, high specific surface area (908.05 m2 g-1) and large pore volume. Due to the introduction of solvothermal method used to prepare Fe3O4@PC, homogeneously distributed magnetic nanoparticles and high saturation magnetization were obtained. Compared with another magnetic porous carbon (Fe3O4@C), Fe3O4@PC obviously enhanced enrichment factors and extraction recoveries. Several key parameters influencing extraction efficiency were optimized. The satisfactory enrichment factors, low limits of detection of the method and good linearities were achieved under the optimal conditions. The relative recoveries ranged from 82.8% to 113.2% in three spiked real samples with relative standard deviations lower than 6.2%. The results indicated the great potential of the novel Fe3O4@PC as adsorbent for the extraction of triazole fungicides from complex real samples.