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8
Excellent Inertness for Aldehydes
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
Most PEG columns can effectively analyze alcohols, esters, and acids, but some exhibit peak-tailing with aldehydes.
The Rtx
®
-Wax column is inert to aldehydes as well because the stationary phase undergoes an extensive purification
procedure. Peak tailingof somestraight-chainaldehydes isapparent ona typical bondedPEGcolumn, but isabsent on
the highly inert Rtx
®
-Wax column (
Figures 7A and 7B
).
Figures 7A and 7B
Rtx
®
-Wax ColumnExhibits Excellent Symmetrical Peak Shape for Aldehydes
1. ethanal
2. propanal
3. butanal
4. pentanal
5. hexanal
6. heptanal
7. octanal
8. nonanal
9. decanal
10. undecanal
1
min. 5
Figure 7A - Rtx
®
-Wax Column
(cat.# 12438)
30m, 0.25mm ID, 0.50µm
Figure 7B - Stabilwax
®
Column
(cat.# 10638)
30m, 0.25mm ID, 0.50µm
2
3
4
5
6
7
8
1 2
4
5
6
7
8
split injection of C2–C11 aldehydemixture.
on-column concentration:
250ng;
Oven temp.:
40°C (hold5min.) to 200°C@10°C/min.;
Inj. & det. temp.:
200°C;
Carrier gas:
hydrogen;
Linear velocity:
35cm/sec. set @ 40°C;
FID sensitivity:
8 x 10
-11
AFS;
Split ratio:
100:1
15
20
min. 5
10
15
20
9
10
3
9
10
10
