A nanocomposite consisting of poly(pyrrole)-poly(aniline) copolymer,graphene oxide and Fe3O4 nanoparticles as novel sorbent for the extraction and preconcentration of polycyclic aromatic hydrocarbons from aqueous samples

Recently, magnetic solid-phase extraction (MSPE), a new mode of SPE method,based on the use of magnetic nanoparticles (MNPs) has been developed [1,2]. In this work, magnetic graphene oxide was functionalized by polyaniline and polypyrrole copolymer and used as an efficient sorbent for the extraction of polycyclic aromatic hydrocarbons (PAHs) followed by GC‒FID. The sorbent was characterized by vibrating sample magnetometry (VSM), Fourier transform infrared spectroscopy (FTIR) and transition electron microscopy (TEM, Fig. 1). The optimal extraction conditions include: sorbent amount, 35 mg; sorption time, 10 min; salt concentration, 30% w/w; type and volume of the eluent, toluene, 1 mL; elution time; 5 min. Under the optimal extraction conditions, limits of detection (LODs) and the linear dynamic ranges were achieved in the range of 0.003‒0.01 ng mL−1 and 0.01–200 ng mL−1, respectively. The absolute extraction recovery (ER%) and relative standard deviations (RSD%) were in the range of 50.4‒78.3% and 5.2‒8.5%, respectively. Finally, the applicability of the method was successfully confirmed by the extraction and determination of PAHs in the real water samples.