Category:Headspace

From LEAP

(Difference between revisions)
Jump to: navigation, search
Line 1: Line 1:
-
Basic Principles of Headspace Analysis
 
[[Image:HS.png|frame|Headspace]]
[[Image:HS.png|frame|Headspace]]
 +
 +
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.
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.
-
<br>
+
<br><br>
Phases of the Headspace Vial
Phases of the Headspace Vial
-
<br>
+
<br><br>
G = the gas phase (headspace)
G = the gas phase (headspace)
The gas phase is commonly referred to as the headspace and lies above the condensed sample phase.
The gas phase is commonly referred to as the headspace and lies above the condensed sample phase.

Revision as of 19:11, 28 April 2009

Headspace
Headspace

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 information:

Pages in category "Headspace"

The following 5 pages are in this category, out of 5 total.

G

I

M

S

V

Personal tools