Adsorption of PFOA at the Air-Water Interface during Transport in Unsaturated Porous Media.

ABSTRACT: Miscible-displacement experiments are conducted with perfluorooctanoic acid (PFOA) to determine the contribution of adsorption at the air-water interface to retention during transport in water-unsaturated porous media. Column experiments were conducted with two sands of different diameter at different PFOA input concentrations, water saturations, and pore-water velocities to evaluate the impact of system variables on retardation. The breakthrough curves for unsaturated conditions exhibited greater retardation than those obtained for saturated conditions, demonstrating the significant impact of air-water interfacial adsorption on PFOA retention. Retardation was greater for lower water saturations and smaller grain diameter, consistent with the impact of system conditions on the magnitude of

SUBMITTER: Lyu Y 

PROVIDER: S-EPMC6312111 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature