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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...

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使用放大光聚合物进行超声波PFAS检测

Alberto Concellón¹, Jesús Castro-Esteban¹, Timothy M Swager¹

¹Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society

|May 11, 2023

概括

此摘要是机器生成的。

新的放大光聚合物 (AFP) 可在超微量水平上现场检测和多基物质 (PFAS). 这一突破解决了水资源基础设施中持续存在的污染物监测方面的挑战.

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科学领域:

环境化学
聚合物科学
分析化学

背景情况:

和多基物质 (PFAS) 是持久性环境污染物,即使在超微度 (ng·L-1) 中,也会对健康产生不利影响.
目前的PFAS检测方法复杂,需要专门的设备,不适合分布式水系统的现场监测.

研究的目的:

开发和评估新的放大光聚合物 (AFP),用于选择性地在现场检测特定的PFAS化合物.
证明AFP在环境相关的超微度下能够检测到酸 (PFOA) 和酸 (PFOS).

主要方法:

使用含基选择器的聚乙烯和多基骨架合成高度的AFP.
通过质子转移反应机制对AFP对PFAS的光反应的研究,导致光谱红移.
用薄膜和纳米颗粒形式的AFP在各种水类 (milliQ,DI,井水) 中进行选择性检测.

主要成果:

在ng·L-1度下,AFP可选择检测PFOA和PFOS.
薄膜AFP检测到大约1ppb的PFAS,而纳米粒子形式检测到大约100ppb.
不同水矩阵的AFP性能一致,不受水类的影响.

结论:

AFPs代表了一种有前途的传感技术,用于在超级检测水平上选择性地检测水性PFAS.
这种方法简化了分布式水基础设施的PFAS监控,克服了当前方法的局限性.
开发的AFP为这些关键污染物实时环境监测提供了可行的解决方案.