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水样中全氟辛酸、全氟辛烷磺酸钾、全氟丁酸、全氟丁烷磺酸经弱阴离子交换固相萃取柱富集净化后,用超高效液相色谱-串联质谱法测定。通过优化样品前处理条件和仪器条件,使4种全氟化合物在0.01μg/L~10.0μg/L范围内线性良好,相关系数为0.9989~0.9999,方法检出限为0.06 ng/L~0.22 ng/L。空白水样3个质量浓度水平的加标回收率为73.1%~91.3%,6次测定结果的RSD为7.4%~14.3%。
Perfluorooctanoic acid, potassium perfluorooctane sulfonate, perfluorobutyric acid and perfluorobutane sulfonic acid were enriched and purified by weak anion exchange SPE column in water samples and determined by ultra performance liquid chromatography-tandem mass spectrometry. By optimizing the sample pretreatment conditions and instrument conditions, the linearity of the four perfluorinated compounds in the range of 0.01μg / L ~ 10.0μg / L was good with the correlation coefficient of 0.9989 ~ 0.9999. The detection limits were 0.06 ng / L ~ 0.22 ng / L. The spiked recoveries of blank water samples at three concentration levels ranged from 73.1% to 91.3%. The RSDs of the six determinations ranged from 7.4% to 14.3%.