Rapid determination of TPA and IPA content in polyester fibers by HPLC with online derivatization
Polyester fibers were depolymerized in potassium hydroxide-ethanol solution,and the depolymerized solution was determined by constant volume with water.The benzene dicarboxylic acid was analyzed by online derivatization high performance liquid chromatography(HPLC),and a rapid method was established for the determination of terephthalic acid(TPA)and isophthalic acid(IPA)content in polyester fibers.The results showed that polyester fibers were completely depolymerized by shaking treatment in potassium hydroxide-ethanol solution at 65 ℃ for 35 min;within the detection wavelength range of 190～360 nm,TPA and IPA had maximum absorption wavelengths at 196 nm and 212 nm,respectively,with secondary absorption wavelengths at 241 nm and 220 nm,respectively.The retention time was 6.038 min and 7.776 min,respectively when the mobile phase was acetonitrile-water(0.1％formic acid,Vacetonitrile∶Vwater=15∶85);the limit of detection of TPA and IPA were 0.50 mg/L and 1.58 mg/L,respectively,and the spiked recoveries were high with the small relative standard deviations.The method exhibits rapid analysis and reliable results with simple pretreatment.
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