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Updated: Jul 22, 2025

Quantitative Detection of Trace Explosive Vapors by Programmed Temperature Desorption Gas Chromatography-Electron Capture Detector
07:57

Quantitative Detection of Trace Explosive Vapors by Programmed Temperature Desorption Gas Chromatography-Electron Capture Detector

Published on: July 25, 2014

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对于挥发性有机化合物的光热吸附-兼容的扩散样品的表征

Jacob S Shedd1, Jonghwa Oh1, Evan L Floyd2

  • 1Department of Environmental Health Sciences, University of Alabama at Birmingham, Birmingham, Alabama 65233, United States.

ACS environmental Au
|July 24, 2023
PubMed
概括

这项研究开发了一种与光热脱附 (PTD) 兼容的新型扩散采样器,用于评估工作场所对挥发性有机化合物 (VOC) 的暴露. 该原型展示了有前途的采样效率,提高了分析灵敏度,以改善职业健康监测.

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Volatilization01:10

Volatilization

Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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Vaporization01:18

Vaporization

The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
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