盐度对全氟和多氟烷基物质(PFAS)在海水-沉积物界面吸附行为的影响

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Abstract 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 K_d 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.

Key words： perfluorinated and polyfluoroalkyl substances (PFAS) seawater sediment salinity adsorption emerging contaminants

Received: 20 June 2023

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	Articles by authors
	JIANG Shu-qi
	BI Yu-jie
	ZHANG Tao
	FENG Zhi-hua
	GENG Qian-qian
	TAN Zhi-jun
	GUO Meng-meng

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JIANG Shu-qi,BI Yu-jie,ZHANG Tao等. Effects of salinity on the adsorption behavior of perfluorinated and polyfluoroalkyl substances (PFAS) at the seawater-sediment interface[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(1): 462-473.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I1/462

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