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Accumulation of PFOA and PFOS at the Air–Water Interface
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2019-07-25 , DOI: 10.1021/acs.estlett.9b00355 Jed Costanza 1 , Masoud Arshadi 2 , Linda M. Abriola 2 , Kurt D. Pennell 1
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2019-07-25 , DOI: 10.1021/acs.estlett.9b00355 Jed Costanza 1 , Masoud Arshadi 2 , Linda M. Abriola 2 , Kurt D. Pennell 1
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Knowledge of perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) accumulation at the air–water interface is critical to understanding the fate and transport of these substances in subsurface environments. The surface tension of aqueous solutions containing PFOA and PFOS at concentrations ranging from 0.1 to >1000 mg/L and with dissolved solids (i.e., cations and anions) commonly found in groundwater was measured using the Wilhelmy plate method. The surface tensions of solutions containing dissolved solids were lower than those for ultrapure water, indicating an increase in the surface excess of PFOA and PFOS in the presence of dissolved solids. An equation for the surface excess of PFOA and PFOS with total dissolved solids was developed by fitting the measured surface tension values, which ranged from 72.0 to 16.7 mN/m, to the Szyszkowski equation. On the basis of mass distribution calculations for a representative unsaturated, fine-grained soil, up to 78% of the PFOA and PFOS mass will accumulate at the air–water interface, with the remaining mass dissolved in water and adsorbed on the solids.
中文翻译：
空气-水界面处的PFOA和PFOS积累
了解全氟辛酸（PFOA）和全氟辛烷磺酸（PFOS）在空气-水界面处的积累对于了解这些物质在地下环境中的命运和运输至关重要。使用Wilhelmy平板法测量了含PFOA和PFOS的水溶液的表面张力，其浓度范围为0.1至> 1000 mg / L，并且具有地下水中常见的溶解固体（即阳离子和阴离子）。含有溶解固体的溶液的表面张力低于超纯水的表面张力，表明存在溶解固体时，PFOA和PFOS的表面过量增加。通过拟合测得的表面张力值（范围从72.0到16.7 mN / m），建立了PFOA和PFOS与总溶解固体的表面过量的方程，到Szyszkowski方程。根据对代表性的不饱和，细粒土壤的质量分布计算，高达78％的PFOA和PFOS质量会在空气-水界面处积聚，而其余质量则溶解在水中并吸附在固体上。
更新日期：2019-07-26
中文翻译：
空气-水界面处的PFOA和PFOS积累
了解全氟辛酸（PFOA）和全氟辛烷磺酸（PFOS）在空气-水界面处的积累对于了解这些物质在地下环境中的命运和运输至关重要。使用Wilhelmy平板法测量了含PFOA和PFOS的水溶液的表面张力，其浓度范围为0.1至> 1000 mg / L，并且具有地下水中常见的溶解固体（即阳离子和阴离子）。含有溶解固体的溶液的表面张力低于超纯水的表面张力，表明存在溶解固体时，PFOA和PFOS的表面过量增加。通过拟合测得的表面张力值（范围从72.0到16.7 mN / m），建立了PFOA和PFOS与总溶解固体的表面过量的方程，到Szyszkowski方程。根据对代表性的不饱和，细粒土壤的质量分布计算，高达78％的PFOA和PFOS质量会在空气-水界面处积聚，而其余质量则溶解在水中并吸附在固体上。
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