Analysis of biomagnification profiles of environmental chemicals in the shallow water ecosystems based on the nitrogen stable isotope ratio

基于稳定氮比（δ^ N）分析，研究了海洋食物网中有机色素、多环芳烃（PAHs）和烷基酚等4种有机物的生物放大特征<15>。三丁基锡（TBT）是有机锡的代表性化合物之一，在沿海食物网中没有表现出明显的生物放大作用（以δ^ N表示<15>），而三苯基锡（TPT）则表现出明显的生物放大作用。二氯二苯三氯乙烷及其代谢物（DDTs）、多氯联苯（PCBs）、氯代二苯化合物（CHLs）和三对氯苯基甲烷（TCPMe）均随δ^ N的增加而显著增加<15>。而与这些有机氯不同的是，多环芳烃的大部分异构体以及烷基酚类物质壬基酚和辛基酚的含量随着δ^ N的增加而显著降低<15>。目前的研究表明，不同于有机氯，有机锡，除了TPT，多环芳烃和烷基酚，通过沿海食物网没有显着的生物放大作用。我们的研究结果与以前的数据的对数转换的辛醇-水分配系数（log Kow）的比较表明，值为5.5（log Kow）代表生物放大或不通过沿海食物网的阈值系数。这意味着位于食物网较低营养级的生物比位于较高营养级的生物积累更多的这些人为化学品。

The present study elucidated the biomagnification profiles of oroganotins, organochrolines, polycyclic aromatic hydrocarbons (PAHs), and alchylphenols through coastal food web based on trophic characterization using stable nitrogen ratio analysis (δ^<15>N). While tributyltin (TBT), one of the representative organotins, showed no significant biomagnification through the coastal food web (expressed by δ^<15>N), significant biomagnification of triphenyltin (TPT) was found. Most of organochlorines, i.e., dichlorodiphenyltrichloroethane and its metabolites (DDTs), polychlorinated biphenyls (PCBs), chlordane compounds (CHLs) and tris-4-chlorophenyl methane (TCPMe) showed the significant positive increases with increases of δ^<15>N. However, unlike these organochlorines, most of isomers of PAHs and nonylphenols and octylphenol, both which are alkylphenols, showed the significant decrease with increases of δ^<15>N. The present study shows that, unlike organochlorines, organotins except for TPT, PAHs and alkylphenols showed no significant biomagnification through the coastal food web. A comparison of our results with previous data on the log transformed octanol-water partition coefficient (log Kow) indicates that a value of 5.5 (log Kow) represents a threshhold coefficient for biomagnification or not through the coastal food web. This means that organisms situated at lower trophic levels of the food web accumulate more of these anthropogenic chemicals than organisms situated at the higher trophic level.