title: Role of Dissolved Organic Matter in Sorption of Perfluorooctanoic Acid to Metal Oxides.
abstract: Perfluorooctanoic acid (PFOA) is an important perfluorinated chemical of significant environmental concern. It has been widely found at high concentrations in the environment. We have exposed sediment constituent minerals SiO2, Fe2O3, and Al2O3 to PFOA and humic acid (HA) and studied the adsorption of PFOA by introducing the adsorbates in different orders. The results suggest concurrent sorption of PFOA and HA to the mineral surface or enhanced PFOA sorption when both are introduced to the aqueous phase. However, when PFOA is introduced to the mineral surface that has already been exposed to and extensively coated with HA, little PFOA adsorption occurs, which implies that PFOA released to rivers rich in dissolved organic matter (DOM, i.e. HA) may be immune to sorptive retention by the sediment and be transported downstream unabated. DOM thus can play a significant role in the transport and fate of PFOA in the natural water system.
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan, ROC.
authors.forename: Kai-Hsing
authors.initials: KH
authors.lastname: Yang
authors.forename: Ci-Jie
authors.initials: CJ
authors.lastname: Ruan
authors.forename: Yen-Ching
authors.initials: YC
authors.lastname: Lin
authors.forename: Meng-Der
authors.initials: MD
authors.lastname: Fang
authors.forename: Chung-Hsin
authors.initials: CH
authors.lastname: Wu
authors.forename: Pui-Kwan Andy
authors.initials: PK
authors.lastname: Hong
authors.forename: Cheng-Fang
authors.initials: CF
authors.lastname: Lin
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D002210:Caprylates / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry; D005466:Fluorocarbons / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry*; D045483:Rivers; D012822:Silicon Dioxide / Q000737:chemistry; D014872:Water Movements
chemical_list: D002210:Caprylates; D005290:Ferric Compounds; D005466:Fluorocarbons; D009930:Organic Chemicals; C000499:ferric oxide; D012822:Silicon Dioxide; C023036:perfluorooctanoic acid; D000537:Aluminum Oxide