In Situ Analysis of Per-and Polyfluoroalkyl Substances Distribution Characteristics in Water-Sediment System Using Diffusive Gradients in Thin Films Probe
10.19756/j.issn.0253-3820.241415
- VernacularTitle:扩散梯度薄膜探针原位分析全/多氟烷基物质在水-沉积物系统中的分布特征
- Author:
Qi-Si CAI
1
;
Xing-Ying LI
;
Fang ZHANG
;
Jun-Wei YANG
;
Si-Si LIU
;
Chang-Er CHEN
Author Information
1. 华南师范大学环境研究院/环境学院,广东省化学污染与环境安全重点实验室,环境理论化学教育部重点实验室,广州 510006
- Keywords:
Per-and polyfluoroalkyl substances;
Passive sampling;
Aquatic environment;
Sediment;
Interface environment behavior
- From:
Chinese Journal of Analytical Chemistry
2025;53(2):300-310,后插1-后插9
- CountryChina
- Language:Chinese
-
Abstract:
The water-sediment interface is an important zone for the migration and transformation of chemical substances,but traditional sampling methods make in situ sampling challenging,thus it is difficult to capture information on environmental processes at the micro-scale.In this study,diffusive gradients in thin films(DGT)probe technique was used as in situ tool to detect 18 kinds of typical per-and polyfluoroalkyl substances(PFAS)in the water-sediment system,elucidating their vertical distribution characteristics and patterns.The results showed that different PFAS exhibited distinct variation patterns with depth in water and sediment.Short-chain PFAS exhibited greater mobility,while the migration of long-chain PFAS was restricted in sediment and pore water due to their strong hydrophobicity and adsorption capacity,resulting in relatively small concentration changes in the sediment column.The PFAS concentrations measured by DGT ranged from 11.2 μg/L to 1305 μg/L.For long-chain PFAS,the concentrations measured by DGT were higher than those obtained from direct measurement of water and pore water,while the opposite results were obtained for short-chain PFAS.The DGT results indicated that although long-chain PFAS exhibited strong adsorption to sediment particles,the adsorbed PFAS were still bioavailable.DGT probe technique,with its advantages of in situ sampling and high spatial resolution,provides deep insights into the complex environmental processes occurring at the microscale in the water-sediment systems.DGT offers important technical support and scientific evidence for assessing the adsorption-desorption behavior,bioavailability,and ecological risks of these emerging pollutants in aquatic environment.
