Exploration of a coordination polymer as a novel sorbent for the solid-phase extraction of benzo[a]pyrene in edible oils

In this paper, a zinc(II) coordination polymer, [Zn(BTA)(2)](n) (BTAH = benzotriazole) was prepared, characterized and explored as a novel sorbent for the solid-phase extraction of trace benzo[a]pyrene in edible oils, with analysis using gas chromatography-mass spectrometry in selected ion monitoring mode (GC-MS, SIM). The resulting material was characterized by XRD, SEM, nitrogen adsorption analysis and elemental analysis. The adsorbent shows great adsorption affinity towards aromatics due to the strong p-p interaction and hydrophobic effect. Herein, benzo[a]pyrene (BaP) in edible oil was chosen as a probe to validate the adsorption capacity and selectivity of the material. With extraction of 0.5 g sample oil, three spiked levels at 0.5-8 mu g kg(-1) were added, with recoveries in the range of 88.7-106% and relative standard deviations ranging from 2.9 to 9.4%. The detection limit is 0.075 mu g kg(-1). The proposed method has been successfully applied for the trace analysis of BaP in several kinds of edible vegetable oil.