Facile synthesis and evaluation of three magnetic 1,3,5-triformylphloro-glucinol based covalent organic polymers as adsorbents for high efficient extraction of phthalate esters from plastic packaged foods

Three covalent organic polymers (COPs) were successfully fabricated by room-temperature solvent-free mechanochemical grinding method between 1,3,5-triformylphloroglucinol (TP) and p-phenyl enediamine (COP1), benzidine (COP2), 4, 4???-diamino-p-terphenyl (COP3), and followed by coprecipitation on the surface of Fe3O4 nanoparticles to form three corresponding magnetic Tp-series COPs. The fabricated magnetic COPs were evaluated and then applied for the extraction of phthalate esters from food samples before gas chromatographytandem spectrometry analysis. Magnetic COP2 exhibited the highest extraction efficiency, which can be attributed to its larger pore size, and its strong hydrophobic and 7C-7C interactions with phthalate esters. The method possessed good linearity (10???1000 ??g???kg??? 1), high sensitivity (0.29???2.59 ??g???kg??? 1 for LODs and 0.97???8.63 ??g???kg??? 1 for LOQs), and satisfactory recoveries (70.2???108.1%) with relative standard deviations lower than 5.2%. This method has potentials for high efficient separation/preconcentration of hydrophobic phthalate esters from foods.