Abstract
A porous magnetic composite adsorbent was developed for the solvent-assisted magnetic solid-phase extraction of polycyclic aromatic hydrocarbons (PAHs). The porous magnetic composite adsorbent was created by incorporating a metal-organic framework (MOF), magnetite nanoparticles, and calcium carbonate into alginate beads. The extraction of the analytes was enabled through hydrophobic and π-π interactions between MOF-5, PAHs, and the organic solvent in the micropores. The fabricated adsorbent was characterized and optimized to improve extraction efficiency. Under the optimum conditions, good linearity was achieved with a detection limit in the range of 0.01–0.10 µg L−1. The developed method was successfully applied to extract PAHs from coffee, cocoa, and tea samples for analysis with high-performance liquid chromatography coupled with fluorescence detection (HPLC-FLD). Relative recoveries were obtained in the range of 70.3–96.1 %, with RSDs below 10 %. The developed adsorbent exhibited good stability and the extraction procedure was simple and rapid. The results obtained with the developed method were used to evaluate the incremental lifetime carcinogenic risk (ILCR) in adults from the intake of coffee, cocoa, and tea. Our calculations showed there was no cancer risk to consumers.
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