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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

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...
Gas Chromatography: Overview of Detectors01:13

Gas Chromatography: Overview of Detectors

Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
A non-destructive detector allows a sample to be analyzed without altering or consuming it, meaning the sample can be collected after detection for further analysis. Examples include thermal conductivity detectors and...
Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...
Gas Chromatography–Mass Spectrometry (GC–MS)01:14

Gas Chromatography–Mass Spectrometry (GC–MS)

Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
A gas chromatograph consists of a long, narrow capillary column with a polysiloxane coating on the inner wall. The coating...
Gas Chromatography: Sample Injection Systems01:08

Gas Chromatography: Sample Injection Systems

In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
Two primary injection methods are used...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

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Related Experiment Video

Updated: May 28, 2026

Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells
08:16

Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells

Published on: October 2, 2016

Versatile computer-controlled system for characterization of gas sensing materials.

M Zhao1, J X Huang, M H Wong

  • 1Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.

The Review of Scientific Instruments
|November 4, 2011
PubMed
Summary

A novel system simultaneously measures electrical and optical responses of gas sensing materials. This versatile system automatically controls parameters to comprehensively evaluate material performance under diverse conditions.

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Quantitative Detection of Trace Explosive Vapors by Programmed Temperature Desorption Gas Chromatography-Electron Capture Detector
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Last Updated: May 28, 2026

Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells
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Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells

Published on: October 2, 2016

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

Published on: July 25, 2014

Area of Science:

  • Materials Science
  • Chemical Sensing
  • Instrumentation Engineering

Background:

  • Gas sensing materials are crucial for environmental monitoring and industrial safety.
  • Characterizing these materials requires precise control over multiple environmental and operational parameters.
  • Existing systems often lack the capability for simultaneous multi-modal measurements and automated control.

Purpose of the Study:

  • To design and describe a versatile system for comprehensive gas sensing material characterization.
  • To enable simultaneous measurement of electrical and optical responses.
  • To facilitate automated control over a wide range of experimental conditions.

Main Methods:

  • Development of a modular system integrating electrical and optical measurement capabilities.
  • Implementation of automated control for gas environment exchange and parameter adjustments.
  • Design for precise control of temperature, pressure, gas concentrations, humidity, and photo-assistance.

Main Results:

  • The system allows simultaneous acquisition of electrical and optical data from gas sensing materials.
  • It enables automated, rapid switching of gaseous environments and precise control over key parameters.
  • The system facilitates the evaluation of sensitivity, stability, selectivity, and dynamic response/recovery times.

Conclusions:

  • The developed system offers a versatile platform for in-depth characterization of gas sensing materials.
  • Simultaneous electrical and optical measurements provide a more complete understanding of sensing mechanisms.
  • Automated control and environmental flexibility enhance the reliability and scope of material performance evaluation.