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Sorption of perfluorinated surfactants on sediments

机译：全氟表面活性剂对沉积物的吸附

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摘要

The sorption of anionic perfluorochemical (PFC) surfactants of varying chain lengths to sediments was investigated using natural sediments of varying iron oxide and organic carbon content. Three classes of PFC surfactants were evaluated for sorptive potential: perfluorocarboxylates, perfluorosulfonates, and perfluorooctyl sulfonamide acetic acids. PFC surfactant sorption was influenced by both sediment-specific and solution-specific parameters. Sediment organic carbon, rather than sediment iron oxide content, was the dominant sediment-parameter affecting sorption, indicating the importance of hydrophobic interactions. However, sorption also increased with increasing solution [Ca2+] and decreasing pH, suggesting that electrostatic interactions play a role. Perfluorocarbon chain length was the dominant structural feature influencing sorption, with each CF2 moiety contributing 0.50-0.60 log units to the measured distribution coefficients. The sulfonate moiety contributed an additional 0.23 log units to the measured distribution coefficient, when compared to carboxylate analogs. In addition, the perfluorooctyl sulfonamide acetic acids demonstrated substantially stronger sorption than perfluorooctane sulfonate (PFOS). These data should prove useful for modeling the environmental fate of this class of contaminants.
机译：使用变化的氧化铁和有机碳含量的天然沉积物，研究了不同链长的阴离子全氟化物（PFC）表面活性剂的吸附。评价了三类PFC表面活性剂的吸附潜力：全氟羧酸盐，全氟磺酸盐和全氟辛基磺酰胺乙酸。 PFC表面活性剂的吸附受沉积物特定参数和溶液特定参数的影响。沉积物的有机碳而不是沉积物的氧化铁含量是影响吸附的主要沉积物参数，表明了疏水相互作用的重要性。但是，吸附也随着溶液[Ca2 +]的增加和pH值的降低而增加，表明静电相互作用起作用。全氟化碳链长是影响吸附的主要结构特征，每个CF2部分对测得的分布系数贡献0.50-0.60 log单位。当与羧酸盐类似物相比时，磺酸盐部分为测得的分布系数贡献了另外的0.23log单位。另外，全氟辛基磺酰胺乙酸显示出比全氟辛烷磺酸酯（PFOS）明显更强的吸附性。这些数据应被证明对建模此类污染物的环境命运很有用。

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