Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario, Canada, M1C 1A4.
Environ Sci Technol. 2013 Jan 15;47(2):923-31. doi: 10.1021/es304276g. Epub 2012 Dec 28.
The main objective of this study was to model the contribution of shelf sediments in the Arctic Ocean to the total mass of neutral organic contaminants accumulated in the Arctic environment using a standardized emission scenario for sets of hypothetical chemicals and realistic emission estimates (1930-2100) for polychlorinated biphenyl congener 153 (PCB-153). Shelf sediments in the Arctic Ocean are shown to be important reservoirs for neutral organic chemicals across a wide range of partitioning properties, increasing the total mass in the surface compartments of the Arctic environment by up to 3.5-fold compared to simulations excluding this compartment. The relative change in total mass for hydrophobic organic chemicals with log air-water partition coefficients ≥0 was greater than for chemicals with properties similar to typical POPs. The long-term simulation of PCB-153 generated modeled concentrations in shelf sediments in reasonable agreement with available monitoring data and illustrate that the relative importance of shelf sediments in the Arctic Ocean for influencing surface ocean concentrations (and therefore exposure via the pelagic food web) is most pronounced once primary emissions are exhausted and secondary sources dominate. Additional monitoring and modeling work to better characterize the role of shelf sediments for contaminant fate is recommended.
本研究的主要目的是使用一组假设化学品的标准化排放情景和多氯联苯同系物 153（PCB-153）的实际排放估算（1930-2100 年），来模拟北极海洋中的陆架沉积物对北极环境中累积的中性有机污染物总量的贡献。研究表明，北极海洋中的陆架沉积物是各种分配特性中性有机化学品的重要储存库，与不包括该储层的模拟相比，将北极环境表面隔室中的总质量增加了高达 3.5 倍。对于空气-水分配系数≥0 的疏水性有机化学品，总质量的相对变化大于与典型持久性有机污染物性质相似的化学品。PCB-153 的长期模拟生成的模型浓度与可用监测数据基本一致，表明一旦主要排放物耗尽且次要源占主导地位，北极海洋中陆架沉积物对影响表层海洋浓度（并因此通过浮游食物链暴露）的相对重要性最为显著。建议进行更多的监测和建模工作，以更好地描述陆架沉积物对污染物归宿的作用。
