Partitioning of perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS) and perfluorooctane sulfonamide (PFOSA) between water and sediment
Partitioning of perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS) and perfluorooctane sulfonamide (PFOSA) between water and sediment
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DOI：
10.1016/j.chemosphere.2011.06.046
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发表时间：
2011-10-01
期刊：
影响因子：
8.8
通讯作者：
Yamashita, Nobuyoshi
中科院分区：
文献类型：
--
作者：
Ahrens, Lutz;Yeung, Leo W. Y.;Yamashita, Nobuyoshi
通过实验室分配实验研究了全氟烷基化合物(PFC)的吸附行为和分配行为。使用了三种不同的沉积物类型，并在低环境现实浓度下分别添加了全氟辛酸(PFOA)、全氟辛烷磺酸盐(PFOS)和全氟辛烷磺胺(PFOSA)。在低悬浮固体浓度下，全氟辛酸、全氟辛烷磺酸和全氟辛烷磺酸主要分布在溶解相中，表明它们在海洋环境中具有远距离迁移的潜力。在所有情况下，平衡等温线是线性的，有机碳归一化分配系数(K-OC)按如下顺序递减：PFOSA(logK-OC=4.1+/-0.35 cm(3)g(-1))>；全氟辛烷磺酸(3.7+/-0.56 cm(3)g(-1))>；全氟辛酸(2.4+/-0.12 cm(3)g(-1))。有机质含量水平对土壤分配有显著影响。对于有机质含量可以忽略不计的沉积物，沉积物的密度成为影响分配的最重要因素。最终，关于全氟碳化物在水介质和悬浮固体之间分配的数据对于模拟其迁移和环境命运至关重要。(C)2011爱思唯尔有限公司。保留所有权利。
Laboratory partitioning experiments were conducted to elucidate the sorption behaviour and partitioning of perfluoroalkyl compounds (PFCs). Three different sediment types were used and separately spiked with perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS) and perfluorooctane sulfonamide (PFOSA) at low environmentally realistic concentrations. PFOA, PFOS and PFOSA were mainly distributed in the dissolved phase at low suspended solid concentrations, indicating their long-range transport potential in the marine environment. In all cases, the equilibrium isotherms were linear and the organic carbon normalised partition coefficients (K-OC) decreased in the following order: PFOSA (log K-OC = 4.1 +/- 0.35 cm(3) g(-1)) > PFOS (3.7 +/- 0.56 cm(3) g(-1)) > PFOA (2.4 +/- 0.12 cm(3) g(-1)). The level of organic content had a significant influence on the partitioning. For the sediment with negligible organic content the density of the sediment became the most important factor influencing the partitioning. Ultimately, data on the partitioning of PFCs between aqueous media and suspended solids are essential for modelling their transport and environmental fate. (C) 2011 Elsevier Ltd. All rights reserved.