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3.5" coil
7" diameter 11-pin cage
ID
df
temp. limits
15-Meter
30-Meter
30-Meter
0.25mm 20µm to 300°C
79717
0.53mm 50µm to 300°C
79723-273
79723
www.restek.com
109
GC COLUMNS |
PLOT COLUMNS
Molecular Sieve 5A Columns
Permanent gases on an Rt®-Msieve 5A PLOT column.
GC_PC00898
1. hydrogen
40ppm
2. argon
30ppm
3. oxygen
50ppm
4. nitrogen
50ppm
5. methane
40ppm
6. carbon monoxide 50ppm
Column:
Rt
®
-Msieve 5A, 30m, 0.53mm ID, 50µm (cat.# 19723)
Sample:
permanent gases (ppm)
Inj.:
5µL sample loop, 6-port Valco
®
valve, valve temp.: ambient
Inj. temp.:
200°C
Carrier gas:
helium, constant flow
Flow:
5mL/min.
Oven temp.:
27°C (hold 5 min.) to 100°C @ 10°C/min. (hold 5 min.)
Det.:
Valco
®
helium ionization detector @ 150°C
Argon resolved
from oxygen.
Excellent
peak shape
for carbon
monoxide.
did you
know
?
Rt®-Msieve 5A PLOT columns are designed
for efficient separation of Ar/O
2
and other
permanent gases, including CH
4
, C
2
H
6
, and CO.
Because molecular sieve materials are very
hydrophilic, they will adsorb water from the
sample or carrier gas. Water contamination
can have a detrimental effect on peak
symmetry and can reduce the resolution of
all compounds. If water contamination
occurs, reactivate your Rt®-Msieve 5A PLOT
column by conditioning at 300 °C with dry
carrier gas flow for 3 hours.
did you
know
?
ShinCarbon ST micropacked columns are another alternative for analyzing permanent gases.
See
page 130
for information.
advanced
technology
Details on
pages 106-107
.
tech
tip
Rt®-Msieve 5A Columns
(fused silica PLOT)
Molecular Sieve 5A PLOT Columns
Restek’s molecular sieve 5A PLOT columns are designed for efficient separation of
Ar/O
2
and other permanent gases, including CH
4
, C
2
H
6
, and CO. Special coating and
deactivation procedures ensure chromatographic efficiency and the integrity of the
porous layer coating. Molecular sieves have very high retention, allowing separations of
permanent gases at temperatures above ambient. Additionally, our unique immobiliza-
tion process guarantees that the uniform particles remain adhered to the tubing—even
after continuous valve-cycling.
Our revolutionary molecular sieve 5A PLOT columns separate Ar/O
2
and H
2
/He at
ambient temperature or above (see figure). These columns also are an excellent choice
for rapid separation of permanent gases in refinery or natural gas.
MXT®-Msieve 5A Columns
(Siltek®-treated stainless steel PLOT)
Advantages of metal MXT® PLOT columns include:
• Can be made in small coil diameters—perfect for tight spaces.
• Will not spontaneously break, making them ideal for rugged environments.
• Designed for robust performance in process GCs and field instruments.
• Available in 3.5" coil diameter or 7" diameter 11-pin cage.
NEW!
ID
df
temp. limits
15-Meter
30-Meter
0.25mm 20µm to 300°C
19773
0.32mm 30µm to 300°C
19720
19722
0.53mm 50µm to 300°C
19721
19723
tech
tip
Carbon dioxide will not elute from molecular
sieve columns. Rt®-Q-BOND is a good choice
for this analysis.
NEW!
Website : www.chromtech.net.au E-mail : info@chromtech.net.au TelNo : 03 9762 2034 . . . in AUSTRALIA
Mar 2011