摘要
模拟海水-沉积物环境,分析了不同盐度影响下5种全氟和多氟烷基物质(PFAS)含量变化,并解析了PFAS的吸附动力学和热力学等吸附行为.在设置的不同盐度实验组中,全氟辛烷磺酸(PFOS)在沉积物中的吸附能力强于相同碳氟链长度的全氟辛酸(PFOA),其中PFOS在沉积物中的吸附量大于其替代物9-氯十六氟-3-氧杂壬烷-1-磺酸钾(9Cl-PF3ONS);PFOA在沉积物中的吸附量大于其替代物六氟环氧丙烷二聚酸(HFPO-DA),而小于另一替代物六氟环氧丙烷三聚酸(HFPO-TA).PFAS的沉积物分配系数(Kd)与盐度呈正相关,随着盐度的升高,PFAS在沉积物中的吸附量随之增加.PFAS的吸附过程涉及了疏水和静电相互作用.
In order to understand adsorption kinetics and thermodynamics of per-and polyfluoroalkyl substances(PEAS),the five PFAS components were detected in the simulated seawater-sediment environments in this study.The adsorption capacity of perfluorooctane sulfonic acid(PFOS)under varying salinity conditions was found to be greater than that of perfluorooctanoic acid(PFOA)with the same carbon-fluorine chain length.The equilibrium adsorption capacity of PFOS in sediments was observed to be higher than that of its alternative,potassium 9-chlorohexadecafluoro-3-oxanonane-1-sulfonate(9Cl-PF3ONS);and the equilibrium adsorption capacity of PFOA in sediments was greater than that of its alternative,hexafluoropropylene oxide dimeric acid(HFPO-DA),but lower than another alternative,hexafluoropropylene oxide trimeric acid(HFPO-TA).A strong positive correlation was observed between the Kd values of PFAS and salinity levels.The sorption of PFAS onto sediments exhibited an upward trend as the salt concentration increased.The adsorption mechanism of PFAS involved both hydrophobic interactions and electrostatic interactions.
作者
姜舒祺
毕宇杰
张涛
冯志华
耿倩倩
谭志军
郭萌萌
JIANG Shu-qi;BI Yu-jie;ZHANG Tao;FENG Zhi-hua;GENG Qian-qian;TAN Zhi-jun;GUO Meng-meng(College of Marine Science and Fisheries,Jiangsu Ocean University,Lianyungang 222005,China;Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Qingdao 266071,China;State Key Laboratory of Mariculture Biobreeding and Sustainable Goods,Qingdao 266071,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2024年第1期462-473,共12页
China Environmental Science
基金
现代农业产业技术体系专项资金资助(CARS-49)
中国水产科学研究院基本科研业务费(2020TD71)。
关键词
全氟和多氟烷基物质(PFAS)
海水
沉积物
盐度
吸附
新污染物
perfluorinated and polyfluoroalkyl substances(PFAS)
seawater
sediment
salinity
adsorption
emerging contaminants