Thermally stable ionic liquid-based sol-gel coating for ultrasonic extraction-solid-phase microextraction-gas chromatography determination of phthalate esters in agricultural plastic films

► A thermally stable ionic liquid-based sol-gel coating ([AMIM][N(SO2CF3)2]-OH-TSO) as solid phase microextraction fiber. ► An ultrasonic extraction-solid phase microextraction-gas chromatography method for the determination of phthalate esters in agricultural plastic films. ► The carryover problem, often encountered when using commercial fibers, has been eliminated when desorption was performed at 360 °C for 8 min. ► The developed fiber has comparable or even higher response to PAEs than the commercial PDMS, PDMS-DVB and PA fibers.