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Effect of geochemical conditions on PFAS release from AFFF-impacted saturated soil columns
Environmental Science: Processes & Impacts ( IF 4.3 ) Pub Date : 2023-01-11 , DOI: 10.1039/d2em00367h
Anastasia Nickerson 1 , Andrew C Maizel 1 , Charles E Schaefer 2 , James F Ranville 3 , Christopher P Higgins 1
Affiliation  

Per- and polyfluoroalkyl substances (PFASs) are frequently found at high concentrations in the subsurface of aqueous film forming foam (AFFF)-impacted sites. Geochemical parameters affect the release of PFASs from source area soils into groundwater but have not been extensively studied for soils that have been historically impacted with AFFF. This study investigated the effects of pH and salt concentrations on release of anionic and zwitterionic PFASs from AFFF-impacted soils in flow-through saturated columns. High pH (10) columns with elevated sodium concentrations had higher cumulative masses eluted of several PFASs compared to pH 3 and pH 7 columns with lower sodium concentrations, likely caused by changes to soil organic matter surface charge. Four PFASs (e.g. 4:2 fluorotelomer sulfonate, perfluorobutane sulfonamido acetic acid) eluted significantly earlier in both pH 3 and pH 10/high NaCl columns compared to pH 7 columns. The results of this study suggest that shifts in pH for soils located at AFFF-impacted sites – particularly raising the pH – may mobilize sorbed PFASs, specifically longer-chain and zwitterionic compounds that are typically strongly sorbed to soil.

中文翻译:

地球化学条件对 AFFF 影响的饱和土柱中 PFAS 释放的影响

全氟和多氟烷基物质 (PFAS) 经常在受水性成膜泡沫 (AFFF) 影响的地点的地下以高浓度被发现。地球化学参数会影响 PFAS 从源区土壤释放到地下水中,但尚未针对历史上曾受 AFFF 影响的土壤进行广泛研究。本研究调查了 pH 值和盐浓度对流通饱和柱中受 AFFF 影响的土壤中阴离子和两性离子 PFAS 释放的影响。与钠浓度较低的 pH 3 和 pH 7 色谱柱相比,钠浓度较高的高 pH (10) 色谱柱具有较高的几种 PFAS 洗脱累积质量,这可能是由于土壤有机质表面电荷的变化所致。四种 PFAS(例如与 pH 7 色谱柱相比,4:2 氟调聚物磺酸盐、全氟丁烷磺酰氨基乙酸)在 pH 3 和 pH 10/高 NaCl 色谱柱中的洗脱明显更早。这项研究的结果表明,位于受 AFFF 影响的地点的土壤 pH 值的变化——特别是提高 pH 值——可能会动员吸附的 PFAS,特别是通常强烈吸附在土壤上的长链和两性离子化合物。
更新日期:2023-01-11
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