R5 AM Perflourochemical Biodegradation, Fate, and Transport
Thursday, 17 November 2005: 8:00 AM - 11:40 AM in 321-323

(SIM-1117-817354) The Adsorption of Perfluorooctanesulfonate onto Sand, Clay, and Iron Oxide Surfaces.

Simcik, Matt¹, Smolen, Jean², Johnson, Ramona¹, Anschutz, Amy³, Penn, R³, ¹ Department of Chemistry, Saint Joseph's University, Philadelphia, PA, USA² Department of Chemistry, University of Minnesota, Minneapolis, MN, USA³ Environmental Health Sciences, University of Minnesota, Minneapolis, MN, USA

ABSTRACT- Fluorinated anionic surfactants have drawn considerable attention due to recent work that has shown significant concentrations of these compounds in surface waters. A detailed understanding of the transport and fate of fluorinated surfactants must start with elucidation of their mineral surface chemistry. Five well characterized solids were equilibrated with solutions of perfluorooctanesulfonate (PFOS) in order to characterize adsorption. Adsorbent surface area normalized adsorption isotherms for Goethite, Kaolinite, Ottawa sand standard, high iron sand and low iron sand will be presented. Additionally mass based adsorption isotherms for Lake Michigan sediment will be presented. Good mass balance was obtained during the experiments and equilibrium adsorption was highest on Ottawa sand standard and lowest on Goethite. There appeared to be no effect of pH on adsorption of PFOS to the mineral surfaces.

Key words: PFOS, adsorption, isotherms