Fate of polycyclic aromatic hydrocarbons from the North Pacific to the Arctic: Field measurements and fugacity model simulation
Fate of polycyclic aromatic hydrocarbons from the North Pacific to the Arctic: Field measurements and fugacity model simulation
复制标题
从北太平洋到北极的多环芳烃的命运：现场测量和逸度模型模拟
DOI：
10.1016/j.chemosphere.2017.06.058
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发表时间：
2017-10-01
期刊：
影响因子：
8.8
通讯作者：
Cai, Minggang
中科院分区：
文献类型：
--
作者：
Ke, Hongwei;Chen, Mian;Cai, Minggang
多环芳烃(PAHs)在北极环境中普遍积累，观察到某些有机污染物由于气候变化而重新挥发。为了研究半挥发性有机化合物在北极的去向，在2010年夏季中国第四次国家北极科考期间，从温带太平洋到北冰洋的表层海水以及北冰洋的一个水柱中采集了溶解的多环芳烃。地表水中7种溶解多环芳烃的总浓度范围为1.0~5.1 ng L-1，随纬度的升高而降低。北冰洋多环芳烃的垂直分布总体上具有表层富集和深度贫化的特征，强调了垂直水层结和颗粒沉降过程的作用。在定态假设下，建立了白令海的III级逸度模式。模型结果定量模拟了多环芳烃在空气和水舱中的转移过程和去向，并突出了白令海夏季多环芳烃从空气到海洋的通量，这意味着至少在夏季，海洋是多环芳烃的汇。在空气-水扩散交换过程中，菲和庚达到平衡，任何扰动，如温度升高，都可能导致不平衡，并将这些化合物从北极的储藏库中重新动员起来。(C)2017爱思唯尔有限公司。保留所有权利。
Polycyclic aromatic hydrocarbons (PAHs) have accumulated ubiquitously inArctic environments, where re-volatilization of certain organic pollutants as a result of climate change has been observed. To investigate the fate of semivolatile organic compounds in the Arctic, dissolved PAHs in the surface seawaters from the temperate Pacific Ocean to the Arctic Ocean, as well as a water column in the Arctic Ocean, were collected during the 4th Chinese National Arctic Research Expedition in summer 2010. The total concentrations of seven dissolved PAHs in surface water ranged from 1.0 to 5.1 ng L-1, decreasing with increasing latitude. The vertical profile of PAHs in the Arctic Ocean was generally characteristic of surface enrichment and depth depletion, which emphasized the role of vertical water stratification and particle settling processes. A level III fugacity model was developed in the Bering Sea under steady state assumption. Model results quantitatively simulated the transfer processes and fate of PAHs in the air and water compartments, and highlighted a summer air-to-sea flux of PAHs in the Bering Sea, which meant that the ocean served as a sink for PAHs, at least in summer. Acenaphthylene and acenaphthene reached equilibrium in air-water diffusive exchange, and any perturbation, such as a rise in temperature, might lead to disequilibrium and remobilize these compounds from their Arctic reservoirs. (C) 2017 Elsevier Ltd. All rights reserved.