Seven seawater polychlorinated biphenyls (PCBs) were measured in water (DAP), suspended particulate matter (SPM), and blue mussels (Mytilus edulis) collected from four beaches in northwest Portugal. PCBs were extracted using solid-phase-extraction, ultrasound-extraction and QuEChERS before GC–MS analysis. The two-year annual average concentrations of PCBs in DAP, SPM and the four-year analysis in mussels were ∼ 4.4 ng/L, ∼15.9 μg/kg, and ∼ 56.0 μg/kg. The results suggest higher concentrations of PCBs in summer for SPM and in spring for mussels, mainly those collected close to the Ave River estuary. The origins of PCBs remain uncertain. Risk assessment shows that PCBs in water are unlikely to harm local biota due to their low thyroid hormone toxicity equivalents (TEQ-TH; ∼1.4E-04 ng/L and ∼ 4.1E-04 μg/kg) and on WHO toxicity equivalents (TEQ-WHO; ∼2.1E-05 ng/L and ∼ 4.9E-05 μg/kg). However, the lifetime carcinogenic risk (LCR) for humans consuming local bivalves is concerning, as it exceeds 1.0E-06.

中文翻译：

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葡萄牙北大西洋海岸线水和贻贝中多氯联苯污染及对人类健康潜在致癌风险分析


在从葡萄牙西北部的四个海滩收集的水 (DAP)、悬浮颗粒物 (SPM) 和蓝贻贝 (Mytilus edulis) 中测量了七种海水多氯联苯 (PCB)。在 GC-MS 分析之前，使用固相萃取、超声萃取和 QuEChERS 萃取 PCB。 DAP、SPM 中 PCB 的两年平均浓度以及贻贝的四年分析结果分别为 ∼ 4.4 ng/L、∼ 15.9 μg/kg 和 ∼ 56.0 μg/kg。结果表明，夏季 SPM 的 PCB 浓度较高，春季贻贝的 PCB 浓度较高，主要是在艾夫河口附近收集的贻贝。多氯联苯的来源仍不确定。风险评估表明，水中的多氯联苯不太可能危害当地生物群，因为它们的甲状腺激素毒性当量（TEQ-TH；∼1.4E-04 ng/L 和 ∼ 4.1E-04 μg/kg）和世界卫生组织毒性当量（ TEQ-WHO；∼2.1E-05 ng/L 和∼ 4.9E-05 μg/kg)。然而，食用当地双壳类动物的终生致癌风险（LCR）令人担忧，因为它超过了 1.0E-06。