Basic HTML Version
www.restek.com
67
GC COLUMNS |
APPLICATION-SPECIFIC COLUMNS
Special ly Deact ivated
Acidic Compounds Analysis
similar
phases
DB-FFAP, HP-FFAP, NUKOL, OV-351,
CP-Wax 58 CB, FFAP
crossbond®
technology
reduces bleed, prolongs column lifetime, and
allows rejuvenation through solvent rinsing.
Underivatized alcoholic beverage acids and methyl esters on a Stabilwax®-DA column.
Peak List
Conc. (ppm)
1. ethyl octanoate
100
2. acetic acid
100
3. propionic acid
100
4. isobutyric acid
100
5. 3-decanol
50
6. ethyl decanoate
50
7. ethyl laurate
50
8.
cis
-lactone
100
9. 2-phenylethanol
50
10.
trans
-lactone
100
11. methyl myristate
50
12. ethyl myristate
50
13. octanoic acid
100
14. ethyl palmitate
50
15. decanoic acid
100
16. dodecanoic acid
100
17. vanillin
100
Column:
Stabilwax
®
-DA, 30m, 0.18mm ID, 0.18µm (cat.# 550752)
Inj.:
1µL splitless (hold 0.5 min.) at conc. shown in
peak list, in ethyl acetate, 4mm ID splitless liner
w/wool (cat.# 20814-202.1)
Inj. temp.:
240°C
Carrier gas:
hydrogen
Make-up gas:
nitrogen
Linear velocity:
28psi @ 240°C
Oven temp.:
70°C to 240°C at 12°C/min. (hold 3 min.)
Det.:
FID
GC_FF00500
Stabilwax®-DA Columns
(fused silica)
(polar phase; Crossbond® acid-deactivated Carbowax® polyethylene glycol—for acidic
compounds)
• Application-specific columns for free (underivatized) acids, some inorganic acids.
• Resistant to oxidative damage.
• Temperature range: 40 °C to 250 °C.
• Equivalent to USP G25, G35 phases.
Stabilwax®-DA bonded polyethylene glycol has an acidic functionality incorporated
into the polymer structure. This permits analysis of acidic compounds without deriva-
tization, significantly reduces adsorption of acids, and increases sample capacity for
volatile free acids. Stabilwax®-DA columns last longer and give better peak shapes for
high molecular weight acids. Some inorganic acids also chromatograph well on a
Stabilwax®-DA column; the limitation is the volatility of the acidic compound.
ID
df
temp. limits
15-Meter
30-Meter
60-Meter
0.25mm 0.10µm 40 to 250°C 11005
11008
11011
0.25µm 40 to 250°C 11020
11023
11026
0.50µm 40 to 250°C 11035
11038
11041
0.32mm 0.10µm 40 to 250°C 11006
11009
11012
0.25µm 40 to 250°C 11021
11024
11027
0.50µm 40 to 250°C 11036
11039
11042
1.00µm 40 to 240/250°C 11051
11054
11057
0.53mm 0.10µm 40 to 250°C 11007
11010
11013
0.25µm 40 to 250°C 11022
11025
11028
0.50µm 40 to 250°C 11037
11040
11043
1.00µm 40 to 240/250°C 11052
11055
11058
1.50µm 40 to 230/240°C 11062
11065
11068
Website : www.chromtech.net.au E-mail : info@chromtech.net.au TelNo : 03 9762 2034 . . . in AUSTRALIA
Mar 2011