Category:Headspace
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[http://www.labhut.com/education/headspace/introduction01.php For more detailed information on Headspace:] | [http://www.labhut.com/education/headspace/introduction01.php For more detailed information on Headspace:] | ||
| - | + | <br><br> | |
| + | ---- | ||
| + | Description | ||
| + | # Headspace analysis uses a partially filled container with the sample of interest | ||
| + | # Sample is allowed to equilibrate in the sealed container | ||
| + | # Volatile compounds diffuse to the surrounding atmosphere also known as headspace | ||
| + | # Portion of the headspace is transported to the injection port of the gas chromatograph where the mixture can be separated for qualitative and/ or quantitative results | ||
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Revision as of 01:13, 1 May 2009
Basic Principles of Headspace Analysis
A headspace sample is normally prepared in a vial containing the sample, the dilution solvent, a matrix modifier and the headspace. Volatile components from complex sample mixtures can be extracted from non-volatile sample components and isolated in the headspace or gas portion of a sample vial. A sample of the gas in the headspace is injected into a GC system for separation of all of the volatile components.
Phases of the Headspace Vial
G = the gas phase (headspace)
The gas phase is commonly referred to as the headspace and lies above the condensed sample phase.
S = the sample phase The sample phase contains the compound(s) of interest. It is usually in the form of a liquid or solid in combination with a dilution solvent or a matrix modifier.
Once the sample phase is introduced into the vial and the vial is sealed, volatile components diffuse into the gas phase until the headspace has reached a state of equilibrium as depicted by the arrows. The sample is then taken from the headspace.
For more detailed information on Headspace:
Description
- Headspace analysis uses a partially filled container with the sample of interest
- Sample is allowed to equilibrate in the sealed container
- Volatile compounds diffuse to the surrounding atmosphere also known as headspace
- Portion of the headspace is transported to the injection port of the gas chromatograph where the mixture can be separated for qualitative and/ or quantitative results
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Pages in category "Headspace"
The following 5 pages are in this category, out of 5 total.
