Abstract
ABSTRACTA novel superparamagnetic Fe3O4 surface molecularly imprinted polymers (MIPs) coated with restricted access materials (RAMs) were prepared for the analysis of dimethyl phthalate (DMP) residues in soils. RAM-MIP with core-shell structure was prepared by coated MIP layer on superparamagnetic Fe3O4 nanoparticle, and 3-glycidoxypropyl trimethoxysilane (KH 560) was grafted on the surface to form hydroxyl group so as to block macromolecules accession. RAM-MIPs were characterized by transmission electron microscope (TEM), scan electron microscope (SEM), vibrating sample magnetometer (VSM), thermal analyzer (TA), and others. RAM-MIPs can be magnetically separated from the matrix easily and exhibited efficient adsorption performance for DMP. The residue of DMP in soil was extracted by acetone:n-hexane (1:1, V/V), cleaned up by RAM-MIPs, and determined by gas chromatography-mass spectrometry (GC-MS). The limits of quantification (LOQ, S/N > 10) for DMP in soil samples were confined to 0.04 mg kg−1. The recoveries and relative standard deviations (RSDs) of DMP spiked at 0.04–0.2 mg.kg−1 were 70.27–80.83% and 2.1–5.7%, respectively. Thus, RAM-MIPs can be successfully applied to the determination of DMP in soil samples.
Published Version
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