Equilibrium sampling of polychlorinated biphenyls in River Elbe sediments - Linking bioaccumulation in fish to sediment contamination
Equilibrium sampling of polychlorinated biphenyls in River Elbe sediments - Linking bioaccumulation in fish to sediment contamination
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DOI：
10.1016/j.chemosphere.2015.08.032
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发表时间：
2015-11-01
期刊：
影响因子：
8.8
通讯作者：
Mayer, Philipp
中科院分区：
文献类型：
--
作者：
Schaefer, Sabine;Antoni, Catherine;Mayer, Philipp
平衡采样可用于测量疏水性有机化学品(HOCs)的自由溶解浓度(不含C)，这些HOCs被认为是扩散吸收和分配的有效浓度。它还可以通过将平衡采样聚合物中的浓度与脂类与聚合物的分配系数相乘，在与沉淀物(标有C-LIP可逆箭头)的热力学平衡状态下产生脂类浓度。我们应用有机硅涂覆玻璃瓶对易北河沿岸十个地点的沉积物样品中的七种“指示剂”多氯联苯(PCB)进行平衡采样，以测量多氯联苯的C(游离态)及其C-唇形可逆箭头。对于三个位置，我们将c(LIP可逆箭头标)与由德国环境标本库独立测定的脂归一化多氯联苯浓度(COIO，LIP)相关联：(1)在所有情况下，c(BIO，LIP)都低于c(LIP可逆箭头标)，(2)两个参数之间存在比例关系，具有高R-2值(0.921.00)和(3)三个站之间的线性回归斜率非常相似(0.297；0.327；0.390)。这些结果证实了多氯联苯的生物积累和沉积物相关HOCs的热力学潜力之间的密切联系，以将其分配为脂类。与基于沉积物总浓度和生物-沉积物累积系数的传统方法相比，这种新方法给出了更清晰和更一致的结果。我们建议应用平衡采样来确定HOCs的生物利用度和生物累积潜力，因为这项技术可以为污染沉积物的风险评估和管理提供热力学基础。(C)2015年提交人。爱思唯尔有限公司出版。
Equilibrium sampling can be applied to measure freely dissolved concentrations (C-free) of hydrophobic organic chemicals (HOCs) that are considered effective concentrations for diffusive uptake and partitioning. It can also yield concentrations in lipids at thermodynamic equilibrium with the sediment (C-lip reversible arrow sed) by multiplying concentrations in the equilibrium sampling polymer with lipid to polymer partition coefficients. We have applied silicone coated glass jars for equilibrium sampling of seven 'indicator' polychlorinated biphenyls (PCBs) in sediment samples from ten locations along the River Elbe to measure c(free) of PCBs and their C-lip reversible arrow sed. For three sites, we then related c(lip reversible arrow sed) to lipid-normalized PCB concentrations (cbio,lip) that were determined independently by the German Environmental Specimen Bank in common bream, a fish species living in close contact with the sediment: (1) In all cases, c(bio,lip) were below c(lip reversible arrow sed), (2) there was proportionality between the two parameters with high R-2 values (0.92-1.00) and (3) the slopes of the linear regressions were very similar between the three stations (0.297; 0.327; 0.390). These results confirm the close link between PCB bioaccumulation and the thermodynamic potential of sediment-associated HOCs for partitioning into lipids. This novel approach gives clearer and more consistent results compared to conventional approaches that are based on total concentrations in sediment and biota-sediment accumulation factors. We propose to apply equilibrium sampling for determining bioavailability and bioaccumulation potential of HOCs, since this technique can provide a thermodynamic basis for the risk assessment and management of contaminated sediments. (C) 2015 The Authors. Published by Elsevier Ltd.