Hollow fiber supported liquid-phase microextraction using ionic liquid as extractant for preconcentration of benzene, toluene, ethylbenzene and xylenes from water sample with gas chromatography-hydrogen flame ionization detection

► Ionic liquid-based HF-LPME used for preconcentration of BTEXs from water. ► Separation and detection is performed by GC-FID. ► LODs are better than or comparable with those of other methods. ► No carry-over interference or extraction solvent interference with the analytes. ► Simple, cheap and environmentally benign.