从2005年到2019年,三种小动物,大西洋鳕鱼(Gadusmorhua),黑线dock(Melanogrammusaeglefinus)和saithe(Pollachiusvirens),大约每三年在北海东北部采样一次。分析了肝脏样本,以调查六组持久性有机污染物(POPs)的水平和时间趋势:多氯联苯(PCBs),二氯二苯基三氯乙烷(DDT)及其降解产物,六氯环己烷(HCHs),六氯苯(HCB),反式-九氯(TNC),和多溴联苯醚(PBDEs)。在鳕鱼中发现了一些最高的平均浓度,否则,这三个物种之间的水平相似,并且大多低于既定的阈值。除HCB和TNC外,所有污染物的含量均高于先前报告的巴伦支海鳕鱼和黑线鱼。Σ7PCB的含量显着下降,ΣDDTs,所有三个物种的ΣHCHs和Σ15PBDEs,对于黑线盒和赛特的跨国公司来说,而鳕鱼中的TNC没有明显趋势。鳕鱼和黑线鳕鱼中的HCB水平显着增加,而赛特则仅显示出少量下降。观察到的遗留持久性有机污染物的时间趋势表明,尽管努力将其从海洋环境中消除,但一些研究的污染物仍存在。
From 2005 to 2019, three gadoid species, Atlantic cod (Gadus morhua), haddock (Melanogrammus aeglefinus) and
saithe (Pollachius virens), were sampled approximately every third year in the northeastern part of the North Sea. Liver samples were analyzed to investigate levels and temporal trends of six groups of persistent organic pollutants (POPs): polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDT) and its degradation products, hexachlorocyclohexanes (HCHs), hexachlorobenzene (HCB), trans-nonachlor (TNC), and polybrominated diphenyl ethers (PBDEs). Some of the highest average concentrations were found in cod, the levels otherwise being similar between the three species and mostly below established threshold values. The levels of all the contaminants except HCB and TNC were higher than previously reported for cod and haddock in the Barents Sea. Significantly decreasing levels were found for Σ7PCBs, ΣDDTs, ΣHCHs and Σ15PBDEs in all three species, and for TNC in haddock and
saithe, while there was no significant trend for TNC in cod. HCB levels increased significantly in cod and haddock and showed only a minor decrease in
saithe. The observed time trends of legacy POPs demonstrate the persistence of some of the studied pollutants despite efforts to eliminate them from the marine environment.