Determination of Phthalate Esters in Water and Coffee by Solid-Phase Microextraction Using Vinyl Terminated Imidazolium Based Ionic Liquid Grafted on Graphene Oxide Coatings

摘要

A series of novel ionic liquids(1-(3-aminopropyl)-3-vinyl imidazolium bromide/tetrafluoroborate)grafted onto graphene oxide-coated stainless-steel wires by a sol-gel technique were fabricated and used as solid-phase microextraction(SPME)fibers for the determination of phthalate esters(PAEs)in water and coffee by a direct immersion-SPME-gas chromatographymass spectrometry(DI-SPME-GC-MS)method.The effect of pH,stirring rate,ionic strength,extraction temperature and extraction time were examined for each home-made fiber.Under optimized conditions,the proposed method displayed wide linearity(0.01-500 μg L?? 1),good repeatability(0.26-13.30%;n= 3),and low limit of detections(LODs,5–30 ng L?? 1).The homemade fibers had good durability and could be used for more than 120 sorption/desorption cycles.The fiber-to-fiber reproducibility was in the range of 1.53-4.53% for 100 μg L?? 1.The method was successfully performed on tap water,seawater and coffee samples with recoveries from 87.6 to 100.7%.The extraction efficiencies of home-made SPME fibers were satisfactorily comparable with those of PA and CAR/PDMS commercial SPME fibers.