相关实验视频

Updated: Jun 23, 2025

Investigating Long-Distance Transport of Perfluoroalkyl Acids in Wheat via a Split-Root Exposure Technique

Investigating Long-Distance Transport of Perfluoroalkyl Acids in Wheat via a Split-Root Exposure Technique

Published on: September 28, 2022

在较低水和条件下的PFAS运输,其特点是仪表柱系统

Matthew Bigler¹, Xuexiang He¹, Mark L Brusseau¹

¹Environmental Science Department, The University of Arizona, Tucson, AZ, 85721, United States.

|June 15, 2024

概括

空气-水界面吸附显著保留和多基物质 (PFAS),如PFOS和PFOA,在沙子中,特别是在低水和度. 这一过程对于理解PFAS在环境中的运输至关重要.

科学领域:

环境科学环境科学
地质化学地质化学
水文地质学水文地质学

背景情况:

perf-和多醇基物质 (PFAS),包括 perfluorooctanesulfonic 酸 (PFOS) 和 perfluorooctanoic 酸 (PFOA),是持久的环境污染物.
了解多孔介质中的PFAS运输机制对于有效的补救策略至关重要.

研究的目的:

调查PFOS和PFOA在沙子中的运输和保留在低水和条件下.
为了确定PFAS在沙性土壤中占主导地位的保留机制.
评估水和对PFAS运输行为的影响.

主要方法:

使用精确表征的沙子进行柱体实验.
在现场使用仪器列监测水和矩阵潜力.
持续监测流量,以确保稳定的条件.
将PFAS运输与非反应性追踪剂进行比较.

主要成果:

空气-水界面吸附是PFOS和PFOA保留的主要机制.
与较高和度 (∼0.66) 相比,在较低的和度 (0.35-0.45) 时,保留量显著更高.
PFOS和PFOA的延迟因子在较低的水和度时大大增加,这表明吸附速度有限.
使用独立确定参数预测的减速因子与测量值密切匹配.

结论:

空气-水界面吸附精确地描述了PFOS和PFOA在一系列水和度的保留.
这些发现表明,在水和度较高时观察到的PFAS保留机制适用于较低和条件.
这项研究提高了对不和土壤环境中的PFAS行为的理解.

关键词:

空气-水界面吸附方式这就是PFOA的PFOA.在PFOS系统中,我们可以储存储存储存储存储存

更多相关视频

Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow

Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow

Published on: April 18, 2019

Tuning a Parallel Segmented Flow Column and Enabling Multiplexed Detection

Tuning a Parallel Segmented Flow Column and Enabling Multiplexed Detection

Published on: December 15, 2015

相关概念视频

Supercritical Fluid Chromatography

Supercritical Fluid Chromatography

Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...

Gas Chromatography: Types of Detectors-II

Gas Chromatography: Types of Detectors-II

In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...