Discussion on results for various Boer surfaces
with
Semivolatiles:
1. Undeactivated borosilicate liner
The
liner
with no deactivation, exhibited surprising response
factors
that at
times were superior or equal
to
one or more ofthe deactivated liners (Figures 2
and 3).
In
general, the amine compounds responded well on
this
liner, even at
4ng concentrations. This is unusual as borosilicate glass can typically display
an acidic character. The %RSD values, however, for this liner were
appreciably higher than the deactivated liners as shown in Table
I.
Therefore,
individual values may be deceiving as
data
over a variety of concentrations
will excessively deviate unpredictably from the desired linear average.
2. Base deactivated liner
Overall,
this
liner
displayed excellent relative response factors.
As
expected,
the
basic semivolatile compounds
had
the highest response and best linearity
on
this
liner. Unfortunately, as shown in Figures 2 and 3, acidic compounds
displayed lower response
factors and
higher %RSD values (Table
1).
Benzo(b)fluoranthene
and
benzo(ghi)perylene also showed
low
response
factors. These undesirable values are the direct result of an inherent basic
character of the modified glass surface
for
this
liner.
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