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7
Rtx
®
-Wax Columns for Difficult Active Compounds
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
· Minimum temperature of 20°C for analysis of volatiles.
· Excellent efficiency and inertness for aldehydes.
· Fast BTEX analyses.
· Thermally stable to 250°C.
The Rtx
®
-Wax column features a bonded, highly inert PEG stationary phase
that provides excellent selectivity for compounds ranging in volatility,molecu-
lar weight, and polarity, and can even resolve aromatic isomers. It has a low
mimimum operating temperature (20°C) for analysis of volatile compounds.
Crossbond
®
cross-linking, or bonding of the stationary phase, provides ther-
mal stabilityat higher temperatures for analysisof higher boiling compounds.
Compared to other available Carbowax
®
columns, the crossbonded Rtx
®
-Wax
column provides a vast operational temperature range, excellent efficiency,
selectivity, and superior inertness. These advantages make it a logical im-
provement for all Carbowax
®
applications.
Benefits of LowTemperature Analyses
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Many PEG columns undergo a solid-liquid phase transition at temperatures
below 40°C, which results in loss of efficiency, reduced sample capacity, and
poor retention time reproducibility. The new Rtx
®
-Wax column can sustain
20°C for limited periods before solidification of the stationary phase occurs.
This is especially advantageous for applications involvingpurge-and-trapand
headspace analyses. Volatile components can be cold-trapped onto the col-
umn and elute as sharp, symmetrical, well-resolved peaks because column
efficiency isstillmaintainedat this low temperature.
Figures6A
and
6B
dem-
onstrate the difference in PEG column performance at 20°C. The Rtx
®
-Wax
columnprovidesbettercolumnefficiencyand resolutionof theanalytes,which
demonstrates that it is farmore suitable for low temperature analyses.
Figures 6A and 6B
Rtx
®
-WaxColumnsMaintainEfficiency at 20°C
1. acetaldehyde
2.methanol
3. acetone
4. ethyl formate
5. ethanol
6. ethyl acetate
7. n-propanol
8. isobutanol
1
min. 5
10
20
15
Figure 6A - Rtx
®
-Wax column
(cat.# 12455)
30m, 0.53mm ID, 1.0µm
Figure 6B - Stabilwax
®
column
(cat.# 10655)
30m, 0.53mm ID, 1.0µm
2
3
4
5
6
7
8
1
2,3
4
5
6
7
8
min. 5
10
20
15
0.1µl split injection of volatile solvents.
Oven temp.:
20°C (hold10min.) to 100°C@5°C/min.;
Inj. & det. temp.:
200°C;
Carrier gas:
helium;
Linear velocity:
40cm/sec. set @ 20°C;
FID sensitivity:
8 x 10
-11
AFS;
Split ratio:
10:1
visit Restek on-line
○ ○ ○ ○
or call
800-356-1688
ext.4
for technical
assistance.
