User`s guide

Method Development
219
Figure 63 Sample Breakthrough
PerkinElmer sample tubes for thermal desorption are compatible
with both pumped and diffusive air monitoring, and are also used to
trap volatiles purged from water, sediment and other sample
matrices. A general guide to adsorbent selection is presented in
Table 13.
Sample Tube
Sorbent
Approximate
Analyte Volatility
Range
Maximum
Temp (°C)
Specific
Surface
Area
(m
2
/g)
Example
Analytes
Glass
fiber filters
n-C
20
to n-C
40
400 Particulate emissions
Carbotrap C
™
Carbopack C
™
Carbopack Y
™
n-C
8
to n-C
30
400 12 Alkyl benzenes, PATD,
PCBs
Tenax TA
™
bp 100°C to 400°C
n-C
7
to n-C
26
350 35 Aromatics except
benzene, Non-polar
components (bp>100°C)
such as aliphatic
hydrocarbons from n-C7
and less volatile polar
components (bp>150°C)
Tenax GR bp 100°C to 450°C
n-C
7
to n-C
30
350 35 Alkyl benzenes, PATD,
PCBs and as above for
Tenax TA
Sample Tube
Vapor
No Breakthrough
Stainless Steel
Gauze
Adsorbent
StrongWeak
Vapor
Breakthrough