Discussion on results for varions liner surfaces
with
Semivolatiles (continned}.:.
3. Intermediate Polarity
(IP)
and
Slltekdeactivated liners
The IP
liners
and
SUlek
liners generally
exhibited the highest average response
factors (Figures 2-6) in conjunctionwith
the
lowest %RSD values (Table
I).
This is
the
most
desirable situation in a test lab environmentwhere the
data
needs
to be both accurate
and
consistent. Individually, the
IP
liners showed
marginal
superiority in overall average response factors
for
some ofthe early
eluting compounds (Figure
2),
but
this
statement does not necessarily hold true
for
the
same compounds at 4ng (Figure 3). Also, o/oRSD values were relatively
identical
throughout
the EPA 8270
subset. The Siltek liners did
show
slightly
superior response factors (both overall and at 4ng) for the mid- to late-eluting
compounds (Figures 2
and
3). For this
half
ofthe study,
Siltek
and
IP
liners
are shown to have equivalent performance for low level semivolatile analysis.
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