液液萃取结合气相色谱–电子捕获检测法(LLE-GC/ECD)测定集中式生活饮用水源地地表水中7种多氯联苯
Determination of Seven Polychlorinated Biphenyls in Surface Water of Centralized Drinking Water Sources by Liquid-Liquid Extraction Coupled with Gas Chromatography-Electron Capture Detection (LLE-GC/ECD)

多氯联苯(PCBs)，是一类有机化合物，集中式生活饮用水源地地表水中多氯联苯包含PCB1016、PCB1221、PCB1232、PCB1242、PCB1248、PCB1254、PCB1260。本文采用液液萃取结合气相色谱–电子捕获检测法(LLE-GC/ECD)测定集中式生活饮用水源地地表水中多氯联苯的含量。结果表明：该方法测定集中式生活饮用水源地地表水中多氯联苯，有很好的校正曲线(R > 0.995)，取样量为1.0 L时，检出限为0.0008~0.0058 μg/L，平均加标回收率为99.5%~120.0%，相对标准偏差(n = 9)为0.6%~4.3%。本方法具有操作简便、灵敏度高和重复性好等特点，为环境监测部门开展饮用水源地多氯联苯的日常监测提供了可靠的分析方法参考。
Polychlorinated biphenyls (PCBs) are a class of organic compounds. The PCBs in surface water of centralized drinking water sources include PCB1016, PCB1221, PCB1232, PCB1242, PCB1248, PCB1254, and PCB1260. This paper uses liquid-liquid extraction combined with gas chromatography-electron capture detection (LLE-GC/ECD) to determine the content of PCBs in surface water of centralized drinking water sources. The results show that this method has a good calibration curve (R > 0.995) for the determination of PCBs in surface water of centralized drinking water sources. When the sample volume is 1.0 L, the detection limit is 0.0008~0.0058 μg/L, the average spiked recovery rate is 99.5%~120.0%, and the relative standard deviation (n = 9) is 0.6%~4.3%. This method is characterized by simplicity, high sensitivity, and good repeatability, providing a reliable analytical method reference for environmental monitoring departments to conduct routine monitoring of PCBs in drinking water sources.