Key Laboratory of Coastal Ecology and Environment of State Oceanic Administration, Department of Marine Chemistry, National Marine Environmental Monitoring Center, Linghe Road 42, Dalian 116023, China.
Mar Pollut Bull. 2012 May;64(5):902-6. doi: 10.1016/j.marpolbul.2012.03.012. Epub 2012 Apr 1.
Sorption of anionic perfluorooctane sulfonate (PFOS) on marine sediment was investigated in detail. It was found that solution ionic composition and sediment-specific parameters played important roles in affecting the sorption of PFOS. The results indicated that sorption of PFOS in seawater to marine sediments was strong (≈ 10 times higher than that in freshwater) and nonlinear (Freundlich n(F) values of 0.77-0.96). The sorption affinity was well correlated with sediment organic carbon content, indicating the importance of hydrophobic interactions. At a PFOS aqueous concentration of 10 μg/L, PFOS distribution coefficients increased with the increasing salinity in solution, with an average rate of 0.48 ± 0.03 log units per a log unit of salinity. Further studies demonstrated that among common ions contributing to the salinity in seawater, dissolved calcium and magnesium are dominantly responsible for the sorption-enhancing effect of salinity for PFOS. This work will aid in better understanding of PFOS sorption mechanisms, and be useful for fate modeling of this class of contaminants in the marine environment.
详细研究了阴离子全氟辛烷磺酸（PFOS）在海洋沉积物上的吸附作用。结果发现，溶液离子组成和沉积物特有参数在影响 PFOS 吸附方面起着重要作用。结果表明，PFOS 在海水中向海洋沉积物的吸附作用很强（≈比在淡水中高 10 倍），且呈非线性（Freundlich n（F）值为 0.77-0.96）。吸附亲和力与沉积物有机碳含量密切相关，表明疏水性相互作用的重要性。在 PFOS 水相浓度为 10μg/L 时，PFOS 分配系数随溶液中盐度的增加而增加，平均每对数单位盐度增加 0.48±0.03 个对数单位。进一步的研究表明，在海水导致盐度的常见离子中，溶解钙和镁是导致盐度增强 PFOS 吸附作用的主要原因。这项工作将有助于更好地理解 PFOS 吸附机制，并有助于对这一类污染物在海洋环境中的归宿模型进行研究。
