Department of Analytical Chemistry, Faculty of Chemistry, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain.
Institute of Materials Science (ICMUV), University of Valencia, Catedrático José Beltrán 2, 46980 Paterna, Valencia, Spain.
Sci Total Environ. 2020 Jul 1;724:138266. doi: 10.1016/j.scitotenv.2020.138266. Epub 2020 Mar 30.
Polychlorinated biphenyls (PCBs) are ubiquitous environmental pollutants whose wide industrial use has been banned over the years in most countries due to their persistence and bioaccumulation. In fact, the International Agency for Research on Cancer defined them in 2016 as carcinogenic to humans based on sufficient evidence of an increased risk of cancer, being children and pregnant or lactating women the most vulnerable population subgroups. In this work, a new alternative for the determination of polychlorinated biphenyls (PCB28, PCB52, PCB101, PCB138, PCB153, and PCB180) in water samples has been developed by using a cyclodextrin-containing silica microparticulated material as an adsorbent in solid-phase extraction. Gas chromatography coupled to an electron capture detector has been used in the quantification step. The methodology allows quantifying polychlorinated biphenyls at very trace levels, with limits of detection between 0.2 and 1.7 ng L. Other parameters such as the repeatability, with coefficients of variation lower than 11%, were likewise established. To end, real water samples were analyzed, and the results were comparable with those obtained with a reference method. The proposed methodology can be utilized for assessing the presence of these compounds in the environment and can come in handy for evaluation and remediation purposes.
多氯联苯（PCBs）是无处不在的环境污染物，由于其持久性和生物累积性，多年来，它们在大多数国家的广泛工业用途已被禁止。事实上，国际癌症研究机构在 2016 年将其定义为人类致癌物质，基于癌症风险增加的充分证据，儿童、孕妇或哺乳期妇女是最脆弱的人群亚组。在这项工作中，通过使用含有环糊精的硅胶微颗粒材料作为固相萃取中的吸附剂，开发了一种用于水样中多氯联苯（PCB28、PCB52、PCB101、PCB138、PCB153 和 PCB180）测定的新方法。在定量步骤中使用了气相色谱法与电子俘获检测器联用。该方法允许在痕量水平下定量多氯联苯，检测限在 0.2 和 1.7ng/L 之间。还确定了其他参数，如重复性，变异系数低于 11%。最后，分析了实际水样，结果与参考方法获得的结果相当。该方法可用于评估这些化合物在环境中的存在情况，也可用于评估和修复目的。
