Determination of Phthalates in Water by Covalent Organic Framework Derived Porous Carbon Solid Phase Microextraction Fiber Combined with Gas Chromatography
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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