Perfluorooctanoate (PFOA) and perfluorooctane sulfonate (PFOS) in soil aroused increasing concern, however there is little information about their transport in porous media, which is urgently needed to better control their environmental risks. In this study, saturated sand columns (considering the coupled effect of solution cation type and pH) and a two-site nonequilibrium transport model (TSM) were used to investigate the transport behaviors and mechanisms of PFOA and PFOS. Breakthrough data and the TSM parameters showed PFOA had higher mobility than PFOS, and divalent cation could inhibit their transport by increasing the nonequilibrium interactions between them and the sand. pH had little influence on PFOA migration when there was only monovalent cation in the solution since PFOA had limited affinity with the sand, however, polyvalent cation could provide additional adsorption sites for it through cation bridging and enhance the effect of pH. Differently, decreasing pH inhibited the transport of PFOS more significantly, and the effect was stronger than that of changing cation type. That proved mechanisms like hydrogen-bonding which were sensitive to solution pH played an important role in PFOS migration. These results provide important scientific basis to the remediation strategy and the migration prediction model development of PFOA and PFOS.

土壤中的全氟辛酸酯（PFOA）和全氟辛烷磺酸（PFOS）引起了越来越多的关注，但是关于它们在多孔介质中的运输的信息很少，因此迫切需要更好地控制其环境风险。在这项研究中，使用饱和砂柱（考虑溶液阳离子类型和pH的耦合效应）和两点非平衡迁移模型（TSM）来研究PFOA和PFOS的迁移行为和机理。突破数据和TSM参数表明，PFOA比PFOS具有更高的迁移率，并且二价阳离子可以通过增加它们与沙子之间的非平衡相互作用来抑制其迁移。当溶液中仅存在一价阳离子时，pH对PFOA迁移的影响很小，因为PFOA与沙子的亲和力有限。多价阳离子可通过阳离子桥接为其提供更多的吸附位点，并增强pH值的作用。不同的是，降低pH值对PFOS的转运有更显着的抑制作用，且其作用强于改变阳离子类型。事实证明，对溶液pH敏感的氢键等机制在PFOS迁移中起着重要作用。这些结果为PFOA和PFOS的修复策略和迁移预测模型的开发提供了重要的科学依据。事实证明，对溶液pH敏感的氢键等机制在PFOS迁移中起着重要作用。这些结果为PFOA和PFOS的修复策略和迁移预测模型的开发提供了重要的科学依据。事实证明，对溶液pH敏感的氢键等机制在PFOS迁移中起着重要作用。这些结果为PFOA和PFOS的修复策略和迁移预测模型的开发提供了重要的科学依据。