文献类型：期刊文献

英文题名：Influence of different types of humic substances on the adsorption behavior of perfluorooctanoic acid in soils: experimental insights and spectral characterization

作者：Li, Mengwei[1,2];Wang, Xinlin[1,2];Wang, Xiaochong[1,2];Zhang, Wei[1,2];Xiu, Guangli[1,2]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Key Lab Environm Risk Assessment & Control Chem Pr, Minist Ecol & Environm, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Environm Protect Key Lab Environm Stand &, Shanghai 200237, Peoples R China

年份：2025

卷号：48

期号：1

外文期刊名：ENVIRONMENTAL GEOCHEMISTRY AND HEALTH

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001618367700001)】；

基金：This work was financially supported by Key Projects of the Joint Fund of Guidelines for Collaborative Implementation and Management of Ecological and Environmental Standards in the Yangtze River Delta (Hu Huan Ke [2024] No. 28).

语种：英文

外文关键词：Perfluorooctanoic acid; Humic acid; Fulvic acid; Fluorescence spectroscopy; Soil

摘要：The adsorption behavior of perfluorooctanoic acid (PFOA) in soils is critical for understanding its environmental transport. However, the effects and mechanisms of humic substances (HS) as an organic soil amendment on PFOA adsorption in soils are still unclear. This study investigated the interactions between HS, particularly humic acid (HA) and fulvic acid (FA), PFOA and soil during the PFOA adsorption process in soil environment. The adsorption capacities of PFOA followed the order: Soil > Soil + HA > Soil + FA > HA > FA. HS, with their negative charges, hindered PFOA adsorption by occupying surface adsorption sites. Fluorescence quenching experiments confirmed HS-PFOA complex formation. PFOA preferentially bound to humic acid-like and fulvic acid-like substances. The primary adsorption sites in both soil and HS were -OH and C-O-C groups. Although HS formed complexes with PFOA, they reduced the overall adsorption capacity in soil. HA provided more hydrophobic interaction sites for PFOA than FA, and FA, with a higher negative charge, exerted stronger electrostatic repulsion, leading to a more significant reduction in PFOA adsorption. This study highlights the role of different HS in PFOA soil adsorption and offers insights for soil remediation and risk assessment of PFOA.