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GCCOLUMNS |
CAPILLARYCOLUMNS
Fused Silica Guard/Retention Gap Columns
Base-DeactivatedGuard/RetentionGapColumns (fusedsilica)
• Testedwith a basic amine testmix.
• Excellent inertness for basic compounds.
• Recommended for usewithRtx®-5Amine,Rtx®-35Amine,Rtx®-VolatileAmine,
and Stabilwax®-DB capillary columns.
• Batch test chromatogram included.
• Maximum temperature: 315 °C.
Chemists using guard columns in the analyses of basic compounds frequently observe
peak tailing and low recovery.This happens because conventionallydeactivated tubing
surfaces can be adsorptive to basic compounds. Restek offers base-deactivated guard
columns, aswell as base-deactivated inlet liners, for completely inert sample pathways.
*30- and 60-meter lengths are banded in 5-meter sections.
†Recommendation: Cut 60m guard columns into shorter lengths. Using full lengthmay cause peak distortion.
didyou
know
?
We testourguardcolumns/transfer lines
withacomprehensive testmix toensure
high inertness.
Hydroguard®Water-ResistantGuard/RetentionGapColumns/Transfer
Lines (fusedsilica)
• Extend analytical column lifetime bypreventingdegradation fromharsh
“steam-cleaning”water injections.
• Testedwith a comprehensive testmix, to ensurehigh inertness.
• Maximum temperature: 325 °C.
When transfer lines from purge & trap systems, air monitoring equipment, or other
instruments carry condensedwater vapor, deactivated column tubingquicklybecomes
active because of the creationof free silanol groups.These silanol groups adsorb active
oxygenated compounds, such as alcohols anddiols.
Restek chemists have addressed this concern and found a solution—theHydroguard®
deactivation process. A unique deactivation chemistry creates a high-density surface
that is not readily attacked by aggressive hydrolysis. The high-density surface coverage
of the Hydroguard® deactivation layer effectively prevents water vapor from reaching
the fused silica surface beneath.UseHydroguard® tubing for connectingGCs to:
• Headspace analyzers.
• Air analysis equipment and concentrator units.
also
available
MetalMXT®GuardColumns
Rugged, flexible, Siltek® treated stainless steel
tubing; inertness comparable to fused silica
tubing. See
page114
.
Nominal ID Nominal OD
5-Meter
5-Meter/6-pk.
0.25mm 0.37± 0.04mm 10000
10000-600
0.32mm 0.45± 0.04mm 10001
10001-600
0.53mm 0.69± 0.05mm 10002
10002-600
also
available
Base-deactivated inlet liners
Seepage213.
Nominal ID Nominal OD
5-Meter
5-Meter/6-pk.
10-Meter
30-Meter* 60-Meter*
†
0.05mm 0.363± 0.012mm 10075
0.10mm 0.363± 0.012mm 10076
0.15mm 0.363± 0.012mm 10077
0.18mm 0.37± 0.04mm 10078
0.25mm 0.37± 0.04mm 10079
10079-600
10082
10085
10088
0.32mm 0.45± 0.04mm 10080
10080-600
10083
10086
10089
0.53mm 0.69± 0.05mm 10081
10081-600
10084
10087
10090
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E-mail :
TelNo : 03 9762 2034 . . . inAUSTRALIA
Mar 2011
