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首页> 外文期刊>Environmental Science & Technology >Characterization of trophic transfer for polychlorinated dibenzo-p-dioxins, dibenzofurans, non- and mono-ortho polychlorinated biphenyls in the marine food web of Bohai Bay, north China
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Characterization of trophic transfer for polychlorinated dibenzo-p-dioxins, dibenzofurans, non- and mono-ortho polychlorinated biphenyls in the marine food web of Bohai Bay, north China

机译：渤海湾海洋食物网中多氯二苯并对二恶英，二苯并呋喃，非和单邻多氯联苯的营养传递特征

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摘要

Many investigations have highlighted the bioaccumulation of dioxins in animals, but little is known about the trophodynamics of dioxins in the food web. In this study, the trophic transfer of nine dibenzo-p-dioxin (PCDD) congeners, eleven dibenzofuran (PCDF) congeners, and twelve non-, mono-ortho polychlorinated biphenyl (non- and mono-ortho PCBs) congeners in a marine food web were determined. The concentrations of PCDDs, PCDFs, non- and mono-ortho PCBs were analyzed in phytoplankton/seston, zooplankton, three invertebrate species, six fish species, and one seabirds species collected from Bohai Bay, representing approximately 4 trophic levels based on stable nitrogen isotope values. Positive relationships were found between trophic levels and lipid equivalent concentrations of non- and mono-ortho PCBs except for PCB-77, PCB-81, PCB-126, PCB-156, and PCB-167, indicating bioaccumulation of these compounds in this food web. But lipid equivalent concentrations of low chlorinated 2,3,7,8-substituted-PCDD/Fs did not exhibit statistically significant trends with trophic levels. And lipid equivalent concentrations of high chlorinated 2,3,7,8-substituted-PCDD/Fs and three non-2,3,7,8-substituted-PCDD/Fs declined significantly with increasing trophic levels providing that these isomers undergo trophic dilution. The similarity in log K-ow values for non-, mono-ortho PCBs, non-2,3,7,8-substituted-PCDD/Fs, and some 2,3,7,8-substituted-PCDD/Fs suggests that the difference of trophic transfer is mainly due to their different metabolic transformation rates.
机译：许多研究都强调了动物体内二恶英的生物蓄积性，但对食物网中二恶英的营养动力学了解甚少。在这项研究中，在海洋食品中营养转移了九种二苯并-对-二恶英（PCDD）同类物，十一种二苯并呋喃（PCDF）同类物和十二种非，单邻多氯联苯（非和单邻多氯联苯）同类物。网络确定。从渤海湾采集的浮游植物/浮游动物，浮游动物，三种无脊椎动物，六种鱼类和一种海鸟物种中的PCDDs，PCDFs，非和单异多氯联苯的浓度进行了分析，基于稳定的氮同位素，它们代表大约4个营养级价值观。发现非正交和单正交PCB的营养水平与脂质当量浓度之间呈正相关关系，但PCB-77，PCB-81，PCB-126，PCB-156和PCB-167除外，表明这些化合物在食物中的生物蓄积性网络。但是，低营养的2,3,7,8-取代的PCDD / Fs的脂质当量浓度在营养水平上没有显示统计学上的显着趋势。随着营养水平的提高，高氯化的2,3,7,8-取代的PCDD / Fs和三个非2,3,7,8-取代的PCDD / Fs的脂质当量浓度显着下降，前提是这些异构体经过营养稀释。非单邻位PCB，非2,3,7,8取代的PCDD / Fs和一些2,3,7,8取代的PCDD / Fs的log K-ow值相似，这表明营养传递的差异主要是由于它们的代谢转化率不同。

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