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首页> 外文期刊>Environmental toxicology and chemistry >Evaluation of polychlorinated biphenyl bioaccumulation patterns in white sea urchins (Lytechinus pictus) using multiple approaches.
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Evaluation of polychlorinated biphenyl bioaccumulation patterns in white sea urchins (Lytechinus pictus) using multiple approaches.

机译：使用多种方法评估白海胆（Lytechinus pictus）中多氯联苯的生物累积模式。

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The bioaccumulation of polychlorinated biphenyls (PCBs) from three amended field-contaminated sediments (with total PCB concentrations of approximately 4, 10, and 100 microg/g dry wt) by white sea urchins (Lytechinus pictus) was evaluated using multiple statistical and theoretical approaches. Similarity analysis of the PCB bioaccumulation patterns, based on the concept of ecological communities, showed that the PCB patterns in the sea urchins and source sediments were essentially identical for all three sediment concentrations. However, affinity analysis did show some preference for bioaccumulation of higher-molecular-weight and more hydrophobic congeners by the urchins. The affinity analysis also showed that within a homologous series, bioaccumulation increased with increasing hydrophobicity. The biota-sediment accumulation factor (BSAF) profiles for the two lower concentration sediments (A and B) were found to be statistically different from the high concentration sample (sediment C) by a multivariate analysis of variance (MANOVA). The relationship between the measured apparent organic carbon-normalized partition coefficients (K(OC)) and octanol-water partition coefficient (K(OW)) (log based) suggested a significant departure from thermodynamic equilibrium. A nonequilibrium, steady-state bioaccumulation model was found to correctly predict the observed experimental bioaccumulation patterns. To improve the model performance, a hydrophobic term was introduced to account for the drop-off in BSAF profiles with log K(OW) > or = 6.5. This study showed that nonequilibrium, steady-state models are far superior to equilibrium partitioning-based models for understanding the bioaccumulation of organic chemicals by sea urchins.
机译：使用多种统计和理论方法评估了白海胆（Lytechinus pictus）对三种经修正的现场污染沉积物（PCB的总浓度约为4、10和100 microg / g干重）的多氯联苯（PCB）的生物蓄积性。 。根据生态群落的概念对多氯联苯生物积累模式的相似性分析表明，对于三种沉积物浓度，海胆和源沉积物中的多氯联苯模式基本相同。但是，亲和力分析的确显示出了一些偏爱野孩子对较高分子量和更多疏水性同类物进行生物富集的倾向。亲和力分析还显示，在同源序列内，生物积累随着疏水性的增加而增加。通过多变量方差分析（MANOVA），发现两个较低浓度沉积物（A和B）的生物沉积物累积因子（BSAF）曲线与高浓度样品（沉积物C）在统计学上不同。实测有机碳归一化分配系数（K（OC））和辛醇-水分配系数（K（OW））（基于对数）之间的关系表明，热力学平衡存在重大差异。发现非平衡稳态生物蓄积模型可以正确预测观察到的实验生物蓄积模式。为了改善模型性能，引入了一个疏水项来解决log的K（OW）>或= 6.5时BSAF轮廓的下降。这项研究表明，非平衡稳态模型远远优于基于平衡分配的模型，以了解海胆对有机化学物质的生物积累。

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