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在现场评估DGT被动采样,以量化测量河流-河口-海水系统中的per-和polyfluoroalkyl物质

Runmei Wang¹, Jingzhi Yao², Jiayin Dai²

¹CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai Shandong, 264003, PR China; Yantai Research Institute, Harbin Engineering University, Yantai, 264006, PR China.

|August 11, 2024

概括

薄膜中的扩散梯度 (DGT) 在动态水系统中有效监测和多基物质 (PFAS). 盐度和暴露时间影响PFAS结合性,DGT为准确的环境评估提供高时间分辨率.

科学领域:

环境化学环境化学
分析化学分析化学
水质监测水质监测

背景情况:

新出现的污染物,如和多基物质 (PFAS),对水生生态系统构成风险.
被动采样技术对于监测复杂水体中的污染物至关重要.
薄膜 (DGT) 方法中的扩散梯度显示了PFAS检测的潜力.

研究的目的:

评估盐度和暴露时间对PFAS监测的DGT性能的影响.
评估DGT作为PFAS在河流-河口-海洋系统中的标准化方法的适用性.
为了比较DGT采样与动态水生环境中的传统抓取采样.

主要方法:

在河流-河口-海洋系统中部署基于树脂的弱离子交换器 (WAX) DGT采样器.
在不同盐度,pH值和溶解有机物条件下,采样时间不同 (<1天至28天).
对DGT设备上的PFAS质量积累的分析和与采集样本的比较.

主要成果:

在14天内,WAX-DGT采样器对大多数PFAS表现良好,除了短链 perfluorocarboxylates (C ≤ 5) 的例外.
14天后的生物污染可能会影响PFAS质量积累.
盐度显著影响了PFAS结合,较短的碳链受到更大的影响.
含有碳基组的PFAS与含有硫基组的PFAS相比,对生物膜的亲和力更高.
与抽取样本相比,DGT提供了更好的PFAS暴露的时间整合.

结论:

DGT提供高时间分辨率监控,对于动态水生系统至关重要.
DGT技术,特别是WAX-DGT,显示出对PFAS监控标准化的承诺.
了解盐度和生物污染的影响是优化DGT部署的关键.
DGT提供了比抽取样本更全面的 PFAS 随时间的暴露评估.

关键词:

生物污染是一种生物污染.新出现的污染物新出现的污染物在现场监控.被动抽样是一种被动抽样.盐分盐分盐分盐分盐分

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