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Gas Chromatography: Introduction

Gas Chromatography: Introduction

Gas chromatography (GC) is a technique for separating and analyzing volatile compounds in a sample. Its primary purpose is to identify and quantify components in complex mixtures, making it essential in fields such as environmental analysis, pharmaceuticals, and petrochemicals. GC is also called vapor-phase chromatography (VPC) or gas-liquid partition chromatography (GLPC).
In GC, a sample is vaporized and mixed with an inert carrier gas (the mobile phase), which transports it through a column.

Gas Chromatography–Mass Spectrometry (GC–MS)

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: Overview of Detectors

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-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...

Gas Chromatography: Types of Detectors-I

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: Sample Injection Systems

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...

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Related Experiment Video

Updated: Jul 11, 2026

Rapid Collection of Floral Fragrance Volatiles using a Headspace Volatile Collection Technique for GC-MS Thermal Desorption Sampling

Rapid Collection of Floral Fragrance Volatiles using a Headspace Volatile Collection Technique for GC-MS Thermal Desorption Sampling

Published on: December 10, 2019

Venus lower atmospheric composition: analysis by gas chromatography.

V I Oyama, G C Carle, F Woeller

Science (New York, N.Y.)

|February 23, 1979

Summary

Gas chromatography reveals Venus

Area of Science:

Planetary Science
Atmospheric Chemistry
Gas Chromatography

Background:

The composition of Venus's lower atmosphere is crucial for understanding its extreme surface temperature and atmospheric dynamics.
Previous Earth-based observations suggested gradients in atmospheric components, hinting at complex chemical processes.

Purpose of the Study:

To conduct the first in-situ gas chromatographic analysis of Venus's lower atmosphere.
To determine the precise concentrations of key atmospheric constituents.
To provide data for validating atmospheric and greenhouse models of Venus.

Main Methods:

Collection and analysis of three atmospheric samples from Venus's lower atmosphere.
Utilized gas chromatography for precise compositional analysis.

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On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

Published on: August 5, 2016

Chromatographic Fingerprinting by Template Matching for Data Collected by Comprehensive Two-Dimensional Gas Chromatography

Chromatographic Fingerprinting by Template Matching for Data Collected by Comprehensive Two-Dimensional Gas Chromatography

Published on: September 2, 2020

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Last Updated: Jul 11, 2026

Rapid Collection of Floral Fragrance Volatiles using a Headspace Volatile Collection Technique for GC-MS Thermal Desorption Sampling

Rapid Collection of Floral Fragrance Volatiles using a Headspace Volatile Collection Technique for GC-MS Thermal Desorption Sampling

Published on: December 10, 2019

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

Published on: August 5, 2016

Chromatographic Fingerprinting by Template Matching for Data Collected by Comprehensive Two-Dimensional Gas Chromatography

Chromatographic Fingerprinting by Template Matching for Data Collected by Comprehensive Two-Dimensional Gas Chromatography

Published on: September 2, 2020

Main Results:

The third atmospheric sample comprised 96.4% carbon dioxide, 3.41% molecular nitrogen, 0.135% water vapor, and 186 ppm sulfur dioxide.
Trace gases detected included molecular oxygen (69.3 ppm), argon (18.6 ppm), and neon (4.31 ppm).
Measured abundances of water vapor and sulfur dioxide align with greenhouse model requirements for Venus's high surface temperature.

Conclusions:

The detected levels of water vapor and sulfur dioxide support greenhouse models explaining Venus's high surface temperature.
Observed gradients of sulfur dioxide, molecular oxygen, and water vapor support the presence of aqueous sulfuric acid clouds.
The inventory of inert gases suggests planetary outgassing as the origin for Venus, Earth, and Mars' atmospheric components.