Determination of Phthalates in Water by Covalent Organic Framework Derived Porous Carbon Solid Phase Microextraction Fiber Combined with Gas Chromatography
The covalent organic framework(COF)FPBA-TAPT was synthesized with 4-formylphenylboronic acid(FPBA)and 2,4,6-tris(4-aminophenyl)-1,3,5-triazine(TAPT)as monomer by the solvothermal reaction.Then the porous carbon material(FTPC)was prepared by direct pyrolysis of FPBA-TAPT precursor.The FTPC was then characterized using Fourier transform infrared spectroscopy(FTIR),X-ray diffractometer(XRD),Raman spectrum and scanning electron microscopy(SEM).The results showed that the material was spherical and its surface was wrinkled.Its specific surface area is 499 m2/g.It served as a coating modified on the surface of stainless steel wire by sol-gel technique to obtain a solid phase microextraction(SPME)fiber to determine phthalates(PAEs)in water samples coupled with gas chromatography.Under the optimized conditions,the method has a wide linear range(0.5-100 μg/L),low limits of detection(0.018-0.106 μg/L),and good stability(RSD≤7.8%).The method was applied to detecting PAEs in three water samples.The spiked recoveries of low(5 μg/L),medium(10 μg/L)and high(50 μg/L)were 79.5%—123.9%and relative standard deviation(RSD)was 1.1%—12.2%,indicating that the method has a good accuracy and can achieve an effective quantitative analysis of PAEs in water.
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