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Characterizing a rapid extraction apparatus for the removal of VOCs from aqueous samples and interfacing it with fast analysis systems such as the aromatic specific laser ionization detector.

机译：表征用于从水性样品中去除VOC并将其与快速分析系统（如芳香族特定激光电离检测器）连接的快速提取设备。

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摘要

Analysis of volatile organic compounds (VOCs) is an important analytical task because of the prevalence of these compounds and the detriment they pose to the environment and human health. There are many improvements that are possible in the extraction and detection steps of these analytes. This dissertation will focus on these improvements. In particular, an extraction apparatus was developed in our laboratory for the removal of VOCs from aqueous samples in less than one minute. Also, a detector that is highly selective for aromatic VOCs will be discussed in detail.;Extraction of VOCs from aqueous samples into the gas phase is often the time-limiting step in an analysis. A rapid aqueous sample extraction (RASE) system was developed that was capable of extracting a VOC from water in less than 15 seconds. It may be coupled on-line with cryofocussing high speed gas chromatography (HSGC) with flame ionization detection (FID). This system was capable of separating five analytes in 10--15 seconds. The sensitivity was in the low mug/L range for analytes such as cyclohexane, toluene, o-xylene, and isopropylbenzene. An advantage of interfacing these systems was that they were capable of handling mixtures that contain complex matrices, such as wastewater. A wastewater sample spiked with cyclohexane, toluene, o-xylene, and isopropylbenzene was extracted, separated and detected with the RASE/HSGC system in less than 45 seconds.;The aromatic specific laser ionization detector (ArSLID) was a highly selective and sensitive alternative for the detection of aromatic VOCs. It operated using resonance enhanced multiphoton ionization (REMPI) and studies were conducted at atmospheric pressure using a low-cost microlaser. At 266.0 nm, the ArSLID was highly selective for a variety of aromatic VOCs. Experiments to determine the sensitivity and selectivity of the ArSLID were demonstrated using gas samples containing 0.1 mug/L (1 pg) each of benzene, toluene, ethylbenzene, o-xylene, and isopropylbenzene, which were separated in less than 30 seconds. These samples also contained non-aromatic compounds that were not detected because their ionization potentials were greater than those of the analytes studied. The ArSLID provided improved selectivity compared to the photoionization detector (PID) or the FID.
机译：挥发性有机化合物（VOC）的分析是一项重要的分析任务，因为这些化合物的普遍性及其对环境和人类健康的危害。这些分析物的提取和检测步骤可能有许多改进。本文将着重于这些改进。特别是，我们实验室开发了一种萃取设备，用于在不到一分钟的时间内从水性样品中去除VOC。同样，将详细讨论对芳香族VOC具有高度选择性的检测器。从分析中将VOC从含水样品中提取到气相中通常是时间限制步骤。开发了一种快速的水样提取（RASE）系统，该系统能够在不到15秒的时间内从水中提取VOC。它可以与带有火焰电离检测（FID）的低温聚焦高速气相色谱（HSGC）在线耦合。该系统能够在10--15秒内分离出五种分析物。对于诸如环己烷，甲苯，邻二甲苯和异丙基苯之类的分析物，灵敏度在低杯/升范围内。连接这些系统的一个优势是它们能够处理包含复杂基质的混合物，例如废水。用RASE / HSGC系统在不到45秒的时间内萃取，分离并检测了掺有环己烷，甲苯，邻二甲苯和异丙基苯的废水样品;芳族比色激光电离检测器（ArSLID）是高度选择性和灵敏的替代品用于检测芳香族VOC。它使用共振增强多光子电离（REMPI）进行操作，并使用低成本的微激光器在大气压下进行研究。在266.0 nm处，ArSLID对多种芳香族VOC具有高度选择性。使用含有0.1杯/升（1 pg）的苯，甲苯，乙苯，邻二甲苯和异丙苯中的每种气体样品进行了测定ArSLID灵敏度和选择性的实验，这些样品在不到30秒的时间内被分离出来。这些样品还包含未被检测到的非芳香族化合物，因为它们的电离势大于所研究分析物的电离势。与光电离检测器（PID）或FID相比，ArSLID提供了更高的选择性。

著录项

  • 作者

    Meyer, Melissa Jean.;

  • 作者单位

    The University of North Dakota.;

  • 授予单位 The University of North Dakota.;
  • 学科 Chemistry Analytical.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 113 p.
  • 总页数 113
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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