organic frameworks(FMOF)and a polyimide(PI)composite strategy.As an auxiliary material,PI was expected to help FMOF particles form well-knit film on the surface of stainless steel wire and reinforce the coating,and FMOF was expected to afford a special structure to absorb,extract and enrich.Furthermore,it was explored for the headspace SPME(HS-SPME)of six volatile aromatic compounds(VACs)from water samples followed by gas chromatographic(GC)separation with flame ionization detection.Under the optimized conditions,the fiber afforded wide linear ranges(1–1000μg L-1),low detection limits(0.15–0.9μg L-1)and acceptable repeatability(<4.6%)and reproducibility(<7.3%).The FMOF@PI coated fiber not only offered large enhancement factors for benzene(1227)but also exhibited high extraction selectivity for benzene to other benzene homologues,hydrocarbons and phenols; for example,the extraction ratio of benzene to toluene,n-hexane and phenol could be as high as 10.2,64.1 and 32.3,respectively.Moreover,the FMOF@PI-coated fiber afforded good thermal,water and organic solvent stabilities,and a long lifetime(over 200 times).The developed method was successfully applied to the determination of VACs in wastewater samples.