MIL-53(Al)/FeO nanocomposite for solid-phase microextraction of organophosphorus pesticides followed by GC-MS analysis.

A novel aluminum terephthalate/FeO nanocomposite was synthesized by the addition of FeO nanoparticles into a reaction solution containing aluminum terephthalate MOF. The synthesized nanocomposite was successfully used as a fiber coating material for solid-phase microextraction (SPME) of six organophosphorus compounds (OPPs) from river water, grape juice, and tea samples. The effect of different parameters on the efficiency of SPME including desorption temperature and time, extraction temperature and time, salt concentration, pH, and agitation were thoroughly studied. The OPPs were detected and determined using GC-MS. According to the findings, a wide linear range (0.15-800 μg kg), low limit of detection (0.04-10 μg kg), and high recoveries from spiked samples (87.5-112%) were achieved with low inter-day relative standard deviation (3.2-6.7%, n = 5). The MIL-53(Al)/FeO nanocomposite showed  a high extraction ability towards OPPs, and hence, it can be considered a promising adsorbent for the extraction of various pesticides in complex matrices like tea and juice.Graphical abstract.