Hung Craig L H, Xu Yan, Lam James C W, Jefferson Thomas A, Hung Samuel K, Yeung Leo W Y, Lam Michael H W, O'Toole Desmond K, Lam Paul K S
Department of Biology and Chemistry, Centre for Coastal Pollution and Conservation, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China.
Chemosphere. 2006 May;63(5):845-52. doi: 10.1016/j.chemosphere.2005.07.059. Epub 2005 Sep 16.
The risks to Indo-Pacific Humpback Dolphins and Finless Porpoises associated with polychlorinated biphenyls (PCBs) were assessed. Stomach contents from twelve stranded Humpback Dolphins and sixteen stranded Finless Porpoises were collected. Concentrations of total and isomer-specific PCBs in the stomach contents were determined using dual-column gas chromatography equipped with electron capture detectors (GC-ECD). Risks due to the PCBs were assessed in three scenarios, based on total PCBs (summation of 41 PCB congeners), total toxicity equivalency (TEQs) and PCB 118, using the toxicity reference values (TRVs) as the threshold effects benchmarks. The calculated risk quotients (RQs) showed that risks due to PCBs were generally low or negligible. Specifically, RQs from total TEQs and total PCBs for Finless Porpoises are below one, suggesting that PCBs should be a low risk for the Finless Porpoise in Hong Kong waters. However, the Humpback Dolphin has RQs larger than 1 for total TEQs and total PCBs when the 95th percentile data were used in the evaluation. This indicates that further investigation may be needed to examine more closely the potential impact of toxic contaminants in the habitat of the Humpback Dolphin.
对印度-太平洋驼背豚和江豚与多氯联苯（PCBs）相关的风险进行了评估。收集了12头搁浅的驼背豚和16头搁浅的江豚的胃内容物。使用配备电子捕获检测器（GC-ECD）的双柱气相色谱法测定胃内容物中总多氯联苯和异构体特异性多氯联苯的浓度。基于总多氯联苯（41种多氯联苯同系物的总和）、总毒性当量（TEQs）和多氯联苯118，在三种情况下评估了多氯联苯造成的风险，使用毒性参考值（TRVs）作为阈值效应基准。计算得出的风险商（RQs）表明，多氯联苯造成的风险通常较低或可忽略不计。具体而言，江豚总TEQs和总多氯联苯的RQs低于1，这表明多氯联苯对香港水域的江豚应是低风险。然而，当在评估中使用第95百分位数数据时，驼背豚总TEQs和总多氯联苯的RQs大于1。这表明可能需要进一步调查，以更密切地研究有毒污染物对驼背豚栖息地的潜在影响。
