Miao Yu, Guo Xuetao, Fan Tingyu, Yang Chen
School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China.
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.
Ecotoxicol Environ Saf. 2017 May;139:102-108. doi: 10.1016/j.ecoenv.2017.01.022.
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.
了解全氟辛酸（PFOA）在土壤颗粒上的吸附情况对于评估其环境风险至关重要。在此，研究了PFOA在十种农业土壤上的吸附情况。考察了土壤理化性质对PFOA吸附的影响。PFOA的吸附速率符合准二级动力学。PFOA吸附的等温线数据用Freundlich模型和线性模型进行拟合，结果表明线性模型拟合效果更好。PFOA在十个土壤样品上的吸附-解吸情况取决于土壤有机碳含量和土壤矿物质组成。除了少数土壤上PFOA的吸附可用Freundlich方程（参数N>1）描述外，PFOA在十种土壤上的吸附和解吸等温线均为线性。全氟辛酸碳链与土壤有机质之间的疏水相互作用是PFOA的主要吸附机制，这一点通过固液分配系数与土壤有机碳分数之间的相关性得到了证实。PFOA在土壤中的吸附具有高度不可逆性。
