User`s guide

Method Development
225
Table 14 Compounds Suitable for Diffusive Sampling
on Tenax GR
Table 15 Compounds Not Suitable for Diffusive Sampling on
Tenax GR
An adsorbent is considered suitable for a particular analyte if the
ambient retention volume exceeds 100 liters/gram. Some
components included in the table as compounds suitable for
sampling on Tenax have therefore been marked with an asterisk
indicate that a stronger adsorbent should be selected for these
analytes where possible. See the note at the bottom of Table 14.
Sandwiched Packings for Wide Boiling
Range Samples
Multi-bed Packings are used for Wide Boiling Range Samples.
Samples with a wide boiling or volatility range are often
encountered, such as gasoline or solvent mixtures, for which a single
sorbent is not adequate. Either it is too strong to release the heavy
compounds or too weak to retain the light compounds. In such cases
it is correct to use a tube or tubes containing two or more packings in
series.
NOTE: Multi-adsorbent sampling systems are not practical with
diffusive monitoring.
Amines
*Pyridine 116 78
Aniline 184 2200
* Indicates that a stronger adsorbent than Tenax should be selected if possible.
Compound Boiling Point (°C) Retention
Volume at 20 °C
(l/g)
Acetone 65 5.4
Dichloromethane 40 3.0
Ethanol 78 1.8