User`s guide

Sampling Techniques
338
Figure 104 Sampling Resins and Ointments
Sampling Solids
Ideal solids for analysis by thermal desorption have a large surface
area/mass ratio: for example powders, films, fibers and granules. In
these cases it is usually possible to obtain complete extraction of the
components of interest in one desorption. Examples include paper,
plastics and packaging.
Figure 105 Sampling Solids
CAUTION
The use of a small adsorbent bed is highly desirable to
prevent high-boiling components of the sample (e.g., resins)
from getting into the ATD/TD plumbing. Contamination of
the ATD/TD at high concentration levels can be very time-
consuming to remove.
PTFE Insert
Stainless Steel Tube
Gauze Rin
g
Glass Wool
Optional
Adsorbent Bed
Sample smeared on th
e
side of the PTFE insert
Stainless Steel Tube
Gauze Rin
g
S
olid
S
ample
Glass Woo
l