Ionic covalent organic frameworks for the magnetic solid-phase extraction of perfluorinated compounds in environmental water samples.

A novel magnetic ionic covalent organic framework (Fe3O4@EB-iCOFs) was designed and synthesized. It was then characterized by X-ray diffraction, N2 adsorption-desorption analysis, and magnetic measurements, among others. The material shows the advantages of ionic property, large surface area, and magnetic responsiveness. It has potential of magnetic solid-phase extraction (MSPE) of perfluorinated compounds (PFCs). A method for the determination of PFCs based on MSPE-HPLC-MS/MS was established. The method has excellent linearity (r ≥ 0.995) in the working range 1-1000 ng L-1 , good repeatability (1.4-5.8%, n = 6), low limits of detection in the range 0.1-0.8 ng L-1 and satisfactory recoveries (between 73.9 and 108.3%).