At-a-Glance
Product
Information
fromRestek
Drilled Uniliner
®
GC Inlet Liners
Under the same conditions, aDrilled
Uniliner
®
with the hole near the top
produces a solvent peakwith a small
tail (Figure 3c). This is because sol-
vent remaining in the liner, between
the hole and the column entrance, is
not swept out of the injection port
when the injector goes into the split
mode. Consequently, we recommend
this liner for analyses inwhich the
analyteswould not be affected by a
solvent tail, such as chlorinated pesti-
cide analysis.ADrilledUniliner
®
with
the hole near the topwill provide the
best transfer of analytes to the col-
umn, and is recommendedwhen
transfer of analytes to the column is
paramount.ADrilledUniliner
®
with
the hole near the top also exhibits
excellent reproducibility for analysis
of glycols inwater
3
.
For accurate, reproducible, problem-
free split/splitless injections, we rec-
ommend you use a Drilled Uniliner
®
inlet liner—and connect it to a Restek
capillaryGC column.
Rtx
®
- 5Sil MS 30m, 0.25 ID, 0.25µm (cat.# 12723)
Sample:
methylene chloride, PR grade
Inj.:
0.5µL, splitless (hold 2.5min.)
4mm single gooseneck inlet liner (cat.# 20799)
4mmDrilledUniliner
®
inlet liner (cat.# 21055)
4mmDrilledUniliner
®
inlet liner (cat.# 20756)
Inj. temp.:
260°C
Carrier gas:
helium, constant pressure
Linear velocity: 17cm/sec. @ 50°C
Oven temp.:
50°C, isothermal
Det.:
FID@ 330°C
GC_EV00680
3a) 4mm single gooseneck
splitless liner
3b) 4mmDrilledUniliner
®
,
hole near bottom
3c) 4mmDrilledUniliner
®
,
hole near top
Figure 3
– Solvent peak profiles fromDrilledUniliner
®
inlet liners and
a splitless liner
The position of
a hole in a
DrilledUniliner
®
inlet liner affects
solvent peak
shape
References
1.
OperatingHints forUsing Split/Splitless Injectors
Restek
Corporation, Bellefonte, PA, 36pp, 2002.
(Reference free on request: cat.# 59880A)
2.
Higher Responses for ChlorinatedPesticides, Using a
DrilledUniliner
®
GC Inlet Liner andRtx
®
-CLPesticides
Columns
RestekCorporation, Bellefonte, PA, 4pp, 2003.
(Reference free on request: cat.# 59487.)
3.
Techniques toOptimizingGCAalysis of Ethylene glycol
inWater
RestekCorporation, Bellefonte, PA, 4pp, 2001.
(Reference free on request: cat.# 59187.)
Tech
Tip
!
HOT
DrilledUniliner
®
TheDrilledUniliner
®
with the hole
near the bottom is recommended for
analysis inwhich compounds of inter-
est could be affected by a tailing sol-
vent peak. TheDrilledUniliner
®
with
the hole near the top is recommended
for aqueous injections, aswell as analy-
sis inwhich the compounds of interest
elute away from the solvent peak.
Continued from page 1
Peak tail from solvent remain
in liner, between hole in liner
and column end
No solvent peak tail, equivalent
to single gooseneck liner
No solvent peak tail
