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Implication of cation-bridging interaction contribution to sorption of perfluoroalkyl carboxylic acids by soils

文献类型： 外文期刊

作者： Wang, Wenfeng 1 ; Rhodes, Geoff 1 ; Zhang, Wei 1 ; Yu, Xiangyang 2 ; Teppen, Brian J. 1 ; Li, Hui 1 ;

作者机构： 1.Michigan State Univ, Dept Plant Soil & Microbial Sci, E Lansing, MI 48824 USA

2.Jiangsu Acad Agr Sci, Jiangsu Key Lab Food Qual & Safety, State Key Lab Cultivat Base, Minist Sci & Technol, 50 Zhongling St, Nanjing 210014, Peoples R China

关键词： Sorption; PFCAs; Soils; Cation-bridging interaction; Multivalent cations

期刊名称：CHEMOSPHERE （ 影响因子：8.943； 五年影响因子：8.52 ）

ISSN： 0045-6535

年卷期： 2022 年 290 卷

页码：

收录情况： SCI

摘要： Sorption of four perfluoroalkyl carboxylic acids (PFCAs) including perfluoropentanoic acid, perfluoroheptanoic acid, perfluorodecanoic acid, and perfluorododecanoic acid by three soils with cation exchange sites occupied by K+, Ca2+, or Fe3+ was measured using the batch equilibration method. We hypothesize that partitioning in soil organic matters (SOM) is the primarily operative mechanism for PFCA sorption by K+-soils, and sorption by Ca2+- or Fe3+ -soils could be enhanced via cation-bridging interaction. The measured sorption isotherms for all four PFCAs by soils were linear within the aqueous concentration between 0 and 60 mu g/L, and the distribution coefficients ranged between 14.8 and 173 L/kg. Long-chain PFCAs manifested greater sorption by the soils with higher SOM content. Compared to sorption by K+-soils, sorption of PFCAs by Ca2+- and Fe3+ -soils increased by 19.9-90.2% and 38.5-219%, respectively. The relative contributions of cation-bridging interaction to the overall PFCA sorption were estimated to be 16.6-48.7% for Ca2+-soils and 27.8-67.7% for Fe3+-soils. These results demonstrate that multivalent exchangeable cations could play an important role, yet previously ignored, in controlling sorption and transport of PFCAs in soils.

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