Gschwend%20thesis.pdf

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Tenax (Applied Science Laborator:Les, Inc i' State College, Pennsylvania)
is a polymer of 2, 6-diphenyl~para-phenylene oxide that has been shown to
serve as a useful adsorbent for low-to~medium polarity organic compounds
(Zlatkis et aL., 1973; Bellar and Lichtenberg, 1974; Novotny et aL., 1974;
Bertsch et al., 1975; Dowty et al., 1975; May et al., 1975). It has no
affinity for water. Furthermore, samples may be stored on Tenax for several
weeks (Zlatkis et aL., 1973). This polymer is thermally stable (up to
4000C; wan Wijk, 1970; Sakodynskii et al., 1974) and hence is suitable for
thermal desorption of a sample load in the hot injection port of a gas
chroma tograph.
Stripper
The stripper (figure I-i) reservoir consisted of a 2 liter "cool
coil" condensor with 24/40 ground glass joints. Below this was a glass-
blown piece including the frit (pencil shaped, fine porosity) for intro-
duction of the purging gas and a sidearm tube with a stopcock and ball
joint for sample input. Above the stripper was a Liebig condensor operated
at 150C to minimize water transport to the trap (Zlatkis et al., 1973;
Novotny et al., 1974)
, An adapter on the Liebig condensor reduced the
24/40 exit to 0.25" glass tube. This, in turn, was reduced with a 0.25"
male to O. 125" male swagelok union with Teflon ferrules. When not in use,
an 0.125" glass rod was inserted into this union to keep the stripper
clean. A Tenax trap was substituted for this rod just prior to seawater
sample introduction into the stripper.
Stripping
,
A precleaned trap was inserted in place on the stripper. The "cool
coil" condensor had 600C water running through it to rapidly heat the