• 6 •
800-356-1688 •
2004vol. 3
Above-AmbientGSCAnalysisofPermanent
GasesandLightHydrocarbons
Using ShinCarbon STMicropacked Columns
by Barry Burger, PetroleumChemist, andGary Stidsen, GCColumnsMarketingManager
•Rapid separations, including CO/CO
2
, without cryogenics.
•Minimal baseline risewithGC/GSC detectors.
•Fast stabilization - ready to use in 30minutes.
ShinCarbon ST, a high surface area carbon
molecular sieve (~1500m
2
/g), is theGSCmedi-
um of choice for gases and highly volatile com-
pounds. A 2-meter, 1mm IDShinCarbon ST
micropacked column separates the permanent
gases in about 10minutes, without cryogenic
cooling (Figure 1), and separates permanent gas
/ light hydrocarbonmixtures quickly and effec-
tively (Figure 1). Additional applications for
ShinCarbon ST include natural gas (Figure 2), sul-
fur dioxide, and Freon
®
fluorocarbons (Figure 3).*
ShinCarbon ST is highly stable. A 330ºC upper
temperature limit ensuresminimal bleed and
baseline rise during temperature programming
andmakes thematerial compatiblewithmost
detection systems used for gas analysis, includ-
ingTCDs andHIDs. ShinCarbon ST columns are
conditioned in an oxygen/moisture free environ-
ment tominimize stabilization time (less than 30
minutes) when installing a new column.
ShinCarbon ST columns eliminate the tempera-
ture and bleed problems that can complicate
analyses of permanent gases, light hydrocar-
bons, and other highly volatile compounds, and
provide excellent resolution and analysis times
for these applications. Micropacked columns
and 2-meter, 2mm ID packed columns are avail-
able from stock; custom columns are available
on request.
ShinCarbonST100/120MicropackedColumns
(Silcosteel®-treated stainless steel)
OD
ID
1-Meter
2-Meter
1
/
16
"
1.0mm
19809
$175
19808
$199
0.95mm
0.75mm
19810
$175
—
—
ShinCarbonST80/100PackedColumns
(Silcosteel®-treated stainless steel)
OD
ID
2-Meter**
1
/
8
"
2.0mm
80486-
$249
InstallationKits forMicropacked
Columns
for 0.75mm ID col.
for 1mm ID col.
For valve applications 21062
$105
21065
$30
For split applications 21063
$15
—
—
For all Agilent GCs
21064
$15
—
—
For direct injections
—
—
21066
$45
Refer toour catalog
orwebsite for
Scott gas standards for
permanent gases and
light hydrocarbons
5µL permanent gasesmix
approx. 5mol. percent each
Figure1
Rapidly separatepermanentgasesorpermanent gas / light hydrocarbonmixtures,without cryogenic
cooling, onaShinCarbonSTmicropackedcolumn.
1. hydrogen
2. oxygen
3. nitrogen
4. carbonmonoxide
5. methane
6. carbon dioxide
GC_PC00666
Conditions for both chromatograms:
ShinCarbon ST 100/120mesh
2meter x 1mm IDmicropacked
(cat.# 19808)
Inj. temp.: 100°C
Carrier gas: helium
Flow rate: 10mL/min.
Oven temp.:
40°C (hold 3min.)
to 250° @ 8°/min.
(hold 10min.)
Det.
HID@ 200°C
1. oxygen
2. nitrogen
3. carbonmonoxide
4. methane
5. carbon dioxide
6. acetylene
7. ethylene
8. ethane
GC_PC00665
ShinCarbon ST 100/120mesh (cat.# 19809)
1meter x 1mm IDmicropacked
Sample:
C1-C6 hydrocarbons, 0.5-8.0% each
Inj. temp.:
200°C
Det.:
FID/250°C
Carrier gas:
helium (constant flow)
Linear velocity: 10mL/min.
Oven temp.:
125°C to 250°C@ 16°C/min.
1. methane
2. ethane
3. propane
4. isobutane
5. n-butane
6. isopentane
7. n-pentane
8. hexanes
Figure2
Monitor componentsof natural gasona
ShincarbonSTmicropacked column.
*For a chromatogram of a sulfur dioxide analysis, visit our
website or request publication 59519A.
**Refer to our catalog or website for available configurations.
ShinCarbon ST 100/120mesh (cat.# 19809)
1meter x 1mm IDmicropacked
Sample:
5µL, ~1-3% each
Inj. temp.:
200°C
Det.:
FID/250°C
Carrier gas:
helium
Linear velocity:
10mL/min.
Oven temp.:
125°C to 320°C@ 16°C/min.
1. Freon
®
134a/22
2. Freon
®
12
3. Freon
®
133a
4. Freon
®
114
GC_PC00673
GC_PC00672
Figure3
Fluorocarbons separated in11minutesona
ShinCarbonST column.
5µL permanent gases
C1+C2 hydrocarbons, 1% each
