Magnetic solid-phase extraction of caffeine from surface water samples with a micro–meso porous activated carbon/Fe₃O₄ nanocomposite prior to its determination by GC-MS

A novel micro-meso porous activated carbon/Fe3O4 (Bm) composite was synthesized from the active charcoal precursor BAX-1500 and used in the magnetic solid-phase extraction (MSPE) of caffeine prior to its determination by gas chromatography-mass spectrometry (GC-MS). The main factors affecting the extraction and desorption steps of the MSPE procedure were investigated and optimized. These factors include extraction time, sorbent mass and salt...