The 7694 Headspace Sampler; Oven (G1289/G1290) - Agilent Technologies G1289 Operating Manual

Introduction to Headspace and to the 7694 Headspace Sampler

The 7694 Headspace Sampler

which there are no matrix effects. Quantitative analysis can be performed by
using suitable internal or external standards.
MHE is available only in models G1289 and G1290. MHE is used for headspace
samples for which no calibration standard can be prepared easily (for example,
solid samples) or for highly volatile compounds in liquids, where the method of
standard addition is difficult because of losses due to evaporation. MHE takes
several headspace samples from each vial. With each extraction, the
concentration of the volatile compound in both the gas phase and the sample
becomes smaller, although the ratio remains constant. The logs of the peak
areas versus the extraction number are plotted to obtain quantitative data
about the compound of interest.
MHE is often used as a calibration tool. Once the peak area versus the
concentration is established for a given sample matrix, quantitative
measurements of samples with a similar matrix can be carried out using a
single extraction.
The 7694 Headspace Sampler
The 7694 Headspace Sampler provides an automated method to run up to
44 samples consecutively without operator attention. The sampler's
microprocessor optimizes the time spent for each run according to the values
programmed in by the operator. Up to four different methods can be stored and
used to analyze a series of samples.
Models G1289 and G1290 can also be used for multiple HS extraction using
multiple septum punctures, with up to 10 extractions per sample.
You can also automate optimization routines. The unit is made up of the
following components:

Oven (G1289/G1290)

The oven contains a circular aluminum sample carousel that can hold up to six
10- or 20 ml sample vials. A resistance band heater is used for heating. A
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