title: Rates and equilibria of perfluorooctanoate (PFOA) sorption on soils from different regions of China.
abstract: Understanding sorption of PFOA on soil particles is crucial to evaluate its environmental risk. Here, sorption of PFOA onto ten agricultural soils was examined. The influence of soil physico-chemical properties on PFOA sorption was investigated. The sorption rate of PFOA followed a pseudo-second-order kinetics. Isotherm data of PFOA sorption was fitted with both Freundlich and linear models and the latter fitted better. The sorption-desorption of PFOA onto ten soil samples depended on soil organic carbon content and composition of soil minerals. The sorption and desorption isotherms of PFOA on ten soils were linear, except for the sorption of PFOA onto a few soils, which was described by the Freundlich equation with the parameter N >1. The main sorption mechanism of PFOA was hydrophobic interaction between the perfluorinated carbon chain and the organic matter of soil, as evidenced by the correlation between the solid-liquid distribution coefficient and the fraction of soil organic carbon. The sorption of PFOA in soils was highly irreversible.
authors.affiliation: School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Miao
authors.affiliation: School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510006, China. Electronic address: guoxuetao2005@163.com.
authors.forename: Xuetao
authors.initials: X
authors.lastname: Guo
authors.affiliation: School of Traffic and Environment，Shenzhen Institute of Information Technology, Shenzhen 518172, China.
authors.lastname: Dan Peng
authors.affiliation: School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China.
authors.forename: Tingyu
authors.initials: T
authors.lastname: Fan
authors.affiliation: Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510006, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Yang
mesh_terms: D000327:Adsorption; D000383:Agriculture; D002210:Caprylates / Q000032:analysis*; D002244:Carbon / Q000737:chemistry; D002681:China; D005466:Fluorocarbons / Q000032:analysis*; D007700:Kinetics; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D002210:Caprylates; D005466:Fluorocarbons; D012987:Soil; D012989:Soil Pollutants; D002244:Carbon; C023036:perfluorooctanoic acid
keywords: Mineral; Organic carbon; Perfluorooctanoate; Soil; Sorption