The complex effect of DOM on PFOA and PFOS transport: considering the interference of solution ionic strength and cation type
The complex effect of DOM on PFOA and PFOS transport: considering the interference of solution ionic strength and cation type
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DOI：
10.1016/j.jece.2022.108619
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发表时间：
2022-09
影响因子：
7.7
通讯作者：
Yingna Xing;Qi Li;Bin Huang;Xin Chen;Lei Ji;Xiaowen Fu;Qiang Zhang;Tianyuan Li;Jianing Wang-Jia
中科院分区：
文献类型：
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作者：
Yingna Xing;Qi Li;Bin Huang;Xin Chen;Lei Ji;Xiaowen Fu;Qiang Zhang;Tianyuan Li;Jianing Wang-Jia
全氟辛酸（PFOA）和全氟辛烷磺酸（PFOS）在多孔介质中的迁移行为控制着它们最终的环境归宿和风险。目前的工作采用柱实验和两个网站的动力学保留模型，以揭示其迁移的溶解性有机质（DOM）的影响下，溶液离子强度和阳离子类型的干扰。结果表明，1 mg/L DOM对PFOA和PFOS的迁移有抑制作用，10 mg/L DOM对PFOA和PFOS的迁移有促进作用。与1 mg/L DOM相比，增加离子强度（1-10 mM）和改变阳离子类型（Na+至Ca 2+）对PFOS的转运有更强的抑制作用。然而，由于全氟辛酸的分子结构和吸附行为与全氟辛烷磺酸不同，全氟辛酸的情况正好相反。Ca 2+更倾向于与全氟辛烷磺酸（由于其磺酸基）而不是与PFOA相互作用，并且全氟辛烷磺酸与Ca 2+的亲和力高于DOM。阳离子桥连和离子强度的增加可促进1 mg/L DOM对PFOA和PFOS转运的抑制作用。在自然环境中，由于孔隙水的溶液化学条件和PFASs的物理化学性质的变化，DOM对PFASs迁移的影响可能非常复杂。研究结果对更好地评价和管理土壤PFASs的环境风险具有科学意义。
The transport behavior of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) in porous media controls their final environmental fate and risk. Current work used column experiments and a two-site kinetic retention model to reveal the effect of dissolved organic matter (DOM) on their migration under the interference of solution ionic strength and cation type. Results showed the migration of PFOA and PFOS was inhibited by 1 mg/L DOM but promoted by 10 mg/L DOM. Compared with the presence of 1 mg/L DOM, increasing ionic strength (1–10 mM) and changing cation type (Na+to Ca2+) had a stronger inhibitory effect on PFOS transport. However, the opposite is true for PFOA due to its different molecular structure and adsorption behavior from PFOS. Ca2+was more tended to interact with PFOS (owing to its sulfonate group) than with PFOA, and PFOS had a higher affinity with Ca2+than with DOM. Cation bridging and increasing ionic strength could promote the inhibition of PFOA and PFOS transport by 1 mg/L DOM. The influence of DOM on PFASs transport could be very complex in the natural environment due to the variable solution chemistry conditions of pore water and physico-chemical properties of PFASs. The results of this work have scientific significance for better evaluating and managing the environmental risk of soil PFASs.