National Wildlife Research Centre, Environment and Climate Change Canada, Carleton University , Raven Road, Ottawa, Ontario, Canada K1A 0H3.
Aquatic Contaminants Research Division, Environment and Climate Change Canada , Burlington, Ontario, Canada L7R 4A6.
Environ Sci Technol. 2017 Apr 4;51(7):3802-3808. doi: 10.1021/acs.est.7b00431. Epub 2017 Mar 23.
There are relatively few studies of polychlorinated naphthalenes (PCNs) for biota in polar regions and even fewer reports of temporal trends. We determined concentrations of PCNs in eggs of thick-billed murres (Uria lomvia) collected from the Canadian high Arctic between 1975 and 2014 and calculated their associated toxic equivalents (TEQs). Concentrations of ΣPCN decreased significantly in the murre eggs between 1975 and 2014 at an average annual rate of -14.9 pg g wet weight. Although the penta- and tetra-CNs (predominantly CN-52/60 and CN-42) dominated the PCN profile, the hexa-CNs (mainly CN-66/67) accounted for the majority of the ΣTEQ-PCN, concentrations of which also decreased significantly between 1975 to 2014. On average, ΣTEQ-PCN in the murre eggs accounted for only 1.9% of the total toxicity calculated for dioxin-like compounds measured in the murre eggs. As such, the TEQ-PCN concentrations calculated for the murre eggs in this study are several orders of magnitude lower than TEQ levels associated with reproductive effects in birds. This is the first published study of temporal trends of PCNs in Canadian Arctic biota.
有关极地生物体内多氯萘（PCNs）的研究相对较少，甚至更少有关时间趋势的报告。我们测定了 1975 年至 2014 年间在加拿大北极地区采集的厚嘴海鸦（Uria lomvia）卵中的 PCN 浓度，并计算了它们的相关毒性等效物（TEQs）。1975 年至 2014 年间，海鸦卵中的ΣPCN 浓度呈明显下降趋势，年均下降率为-14.9 pg g 湿重。尽管五氯和四氯萘（主要为 CN-52/60 和 CN-42）占据了 PCN 分布的主导地位，但六氯萘（主要为 CN-66/67）占据了ΣTEQ-PCN 的大部分，其浓度在 1975 年至 2014 年间也呈明显下降趋势。平均而言，海鸦卵中的ΣTEQ-PCN 仅占海鸦卵中测量的类二恶英化合物总毒性的 1.9%。因此，本研究中海鸦卵中计算得出的 TEQ-PCN 浓度比与鸟类生殖效应相关的 TEQ 水平低几个数量级。这是首次发表的加拿大北极生物体内 PCN 时间趋势的研究。
