School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China.
J Environ Sci (China). 2020 Nov;97:194-199. doi: 10.1016/j.jes.2020.04.021. Epub 2020 Jun 2.
Eighteen polycyclic aromatic hydrocarbons (PAHs) were detected in benthos collected onboard the 'Snow Dragon' in the Northern Bering Sea Shelf and Chukchi Sea Shelf during the 6 Chinese National Arctic Research Expedition (CHINARE 2014). ΣPAHs for all biota samples ranged from 34.2 to 128.1 ng/g dry weight (dw), with the highest concentration observed in fish muscle (Boreogadus saida) samples close to St. Lawrence Island. The PAH composition pattern was dominated by the presence of lighter 3 ring (57%) and 2 ring (28%) PAHs, indicating oil-related or petrogenic sources as important origins of PAH contamination. Concentrations of alkyl-PAHs (1-methylnaphthalene and 2-methylnaphthalene) were lower than their parent PAH (naphthalene) in all biological tissue, and their percentage also decreased significantly (p<0.05) compared with those in the corresponding sediment. There were no significant relationships between PAH concentrations and trophic levels, which is possibly due to the combined results of the complex benthic foodweb in the subarctic/Arctic shelf region, as well as a low assimilation/effective metabolism for PAHs. According to toxic potency evaluation results from TCDD toxic equivalents (TEQs) and BaP-equivalent (BaPE) values, whelk (Neptunea heros) and starfish (Ctenodiscus crispatus) are two macroinvertebrate species showing relatively higher dioxin-like toxicity and carcinogenic risk.
在“雪龙”号上采集的北白令海大陆架和楚科奇海大陆架底栖生物中，检测到了 18 种多环芳烃（PAHs）。所有生物样本中ΣPAHs 的浓度范围为 34.2-128.1ng/g 干重（dw），在靠近劳伦斯岛的鳕鱼（Boreogadus saida）肌肉样本中浓度最高。PAH 组成模式以轻 3 环（57%）和 2 环（28%）PAHs 的存在为主，表明油类或生源来源是 PAH 污染的重要来源。在所有生物组织中，烷基 PAHs（1-甲基萘和 2-甲基萘）的浓度均低于其母体 PAH（萘），且与相应沉积物相比，其百分比也显著降低（p<0.05）。PAH 浓度与营养水平之间没有显著关系，这可能是由于亚北极/北极大陆架地区复杂的底栖食物网以及对 PAHs 的低同化/有效代谢的综合结果。根据 TCDD 毒性当量（TEQs）和 BaP 当量（BaPE）值的毒性效力评估结果，海蜗牛（Neptunea heros）和海星（Ctenodiscus crispatus）是两种表现出相对较高的二噁英样毒性和致癌风险的大型无脊椎动物物种。
