Objective: To establish a method for the determination of two perfluorinated compounds in urine by liquid chromatography-tandem mass spectrometry. Methods: In November 2022, urine samples were extracted by acidic methanol, purified by WAX solid phase extraction column, and eluted with methanol water, then Waters ACQUITY UPLC BEH C18 column (100 mm×2.1 mm, 1.7 μm) was used with 1.0 mmol/L ammonium acetate solution and methanol as mobile phase. The gradient elution was carried out, the detection was carried out by electrospray negative ion multiple response monitoring (MRM) mode, and the quantitative method was internal standard method. Results: Perfluorooctanoic acid and perfluorooctane sulfonic acid had a good linear relationship in the concentration range of 0.5-50.0 μg/L, and the correlation coefficient was >0.999. The limit of detection was 0.017 μg/L, and the limit of quantitation was 0.005 μg/L. The average recoveries were 96.3% and 101.8%, respectively. Days of precision were 3.5%-6.2% and 3.1%-7.4%, respectively, daytime precision were 4.3%-6.8% and 4.7%-8.1%, respectively. Conclusion: The established method of liquid chromatography-tandem mass spectrometry is high sensitivity and accuracy, and is suitable for the determination of perfluorooctanoic acid and perfluorooctane sulfonic acid in human urine.
目的： 建立液相色谱串联质谱法快速测定尿液中全氟辛烷磺酸和全氟辛酸含量的方法。 方法： 于2022年11月，将尿液样品经酸性甲醇提取，WAX固相萃取柱净化，甲醇水洗脱后，采用Waters ACQUITY UPLC BEH C18柱（100 mm×2.1 mm，1.7 μm），以1.0 mmol/L乙酸铵溶液和甲醇为流动相，进行梯度洗脱；以电喷雾负离子多反应监测模式进行检测，内标法定量。 结果： 全氟辛酸和全氟辛烷磺酸在0.5~50.0 μg/L浓度范围内均具有良好的线性关系，相关系数均>0.999，方法的检出限为0.017 μg/L，定量限为0.005 μg/L，平均加标回收率分别为96.3%和101.8%，日内精密度分别为3.5%~6.2%和3.1%~7.4%，日间精密度分别为4.3%~6.8%和4.7%~8.1%。 结论： 液相色谱串联质谱方法灵敏度高、准确度好，可用于人体尿液中全氟辛烷磺酸和全氟辛酸的测定。.
Keywords: Chromatography, liquid; Fluorine compounds; Perfluorooctane sulfonic acid (PFOS); Perfluorooctanoic acid (PFOA); Solid phase extraction; Tandem mass spectrometry; Urine.