Magnetic solid extraction of PCBs in the fruit juices based on polyaniline-modified CoFeO@TiC composite.

Polychlorinated biphenyls (PCBs) have been known pollutants, which are ubiquitous in various matrix, even in some food products and beverages like fruit juices. It is of great importance to develop efficient and simple method to detect them in such matrix. In this work, an effective magnetic composite integrating the advantages of the magnism of CoFeO, hydrophilicity and multisites of TiC and high adsorption properties of polyaniline (CoFeO@TiC@PANI) was designed and synthesized. CoFeO@TiC@PANI-based magnetic solid-phase extraction coupled with gas chromatography-tandem mass spectrometry was established for determination of nine PCBs in fruit juices. The developed method achieved low detection limits of 0.4-0.8 ng L. The established method was validated with three beverages and achieved good spiked recoveries ranging from 77.2 % to 104.7 %. These findings exhibited that the established method was very simple, efficient, and credible for the analysis of PCBs in food, environmental, and other fields.