Comprehensively understanding the fate and transport of perfluorooctanoic acid (PFOA) in subsurface environment is crucial to assess its environmental impacts. In this work, column experiments were conducted to investigate the effects of physicochemical factors on the retention and transport of ¹⁴C-labeled PFOA in saturated sand and limestone porous media. The retention of PFOA in limestone columns was higher than that in sand columns under the same solution chemistry conditions. This can be attributed to that the limestone had less negative zeta-potential and larger specific surface area than the sand. Changes in ionic strength (low to high) and cation type (Na⁺ to Ca²⁺) had little influences on the mobility of PFOA in sand porous media, but significantly enhanced the retention of PFOA in limestone porous media. Nearly no PFOA was retained in the sand columns, but relatively high levels of PFOA retention (28.7–48.4%) were achieved in the limestone columns. Higher input concentration resulted in lower PFOA retention in limestone porous media, reflecting the blocking effect of the sorption sites. The blocking effect was insignificant in sand porous media, probably because the experimental conditions were unfavorable for PFOA sorption on sand media. A two-site kinetic retention model effectively simulated both the breakthrough and retention behaviors of the PFOA in the sand and limestone porous media.

全面了解全氟辛酸（PFOA）在地下环境中的命运和运输对于评估其环境影响至关重要。在这项工作中，进行了柱实验，以研究理化因素对¹⁴ C标记的PFOA在饱和砂和石灰石多孔介质中的保留和运输的影响。在相同的溶液化学条件下，石灰石柱中PFOA的保留率高于砂柱中的PFOA。这可以归因于石灰石比沙子具有更少的负ζ电势和更大的比表面积。离子强度（从低到高）和阳离子类型（Na ⁺到Ca ^{2+）的变化}）对PFOA在砂多孔介质中的迁移率几乎没有影响，但显着提高了PFOA在石灰石多孔介质中的保留。砂柱中几乎没有PFOA保留，但石灰石柱中PFOA的保留水平相对较高（28.7–48.4％）。较高的输入浓度会导致PFOA在石灰石多孔介质中的保留较低，反映出吸附位点的阻滞作用。在砂质多孔介质中的阻隔作用微不足道，可能是因为实验条件不利于PFOA在砂质介质上的吸附。两点动力学保留模型有效地模拟了PFOA在沙子和石灰石多孔介质中的穿透和保留行为。