124
GC COLUMNS |
PACKED/MICROPACKED COLUMNS
Bonded Stat ionar y Phases
Figure 1
Bonded packed columns exhibit longer lifetime than nonbonded packed columns.
12
13
14 15 16
17 18
11 10 9 8765432
1
min. 0
10
20
30
Nonbonded Methyl Silicone
1. pentane
2. hexane
3. heptane
4. octane
5. nonane
6. decane
7. undecane
8. dodecane
9. tetradecane
10. hexadecane
11. octadecane
12. eicosane
13. tetracosane
14. octacosane
15. dotricontane
16. hexatricontane
17. tetracontane
18. tetratetracontane
25" x
1
/
8
" x 2mm ID Rtx
®
-1 SimDist 2887 SilcoSmooth
®
stainless steel (cat.# 80000-800)
1.0µl direct injection, 1–12% (w/w) each component
Oven temp.:
35°C to 350°C @ 10°C/min. (hold 5 min.)
Inj. & det. temp.:
350°C
Carrier gas:
helium @ 25mL/min.
FID sensitivity:
256 x 10
-11
AFS
cat.# 31674 (1% each listed analyte in CS
2
) and cat.# 31675 (5% each, neat) meet
requirements of ASTM D2887-01.
18 17 16 15 14
13
12
11 10 9 87654
1
32
Low bleed after 170
cycles to 350°C!
min. 0
10
20
30
Bonded Rtx®-1
GC_PC00369
Analytes cannot
be quantified
Restek’s packed columns deliver the
1
-
2
-
3
PUNCH!
1. Bonded stationary phases mean short
conditioning times, low bleed, and
unsurpassed column lifetimes.
2. SilcoSmooth® tubing provides the inertness of
glass and the durability of stainless steel.
3. Silcoport® diatomaceous earth provides
unsurpassed inertness for trace analysis.
Bonded Packed Column Stationary Phases
• Short conditioning times.
• Low bleed levels.
• Higher sensitivities.
• Longer column lifetimes.
• Unsurpassed inertness for active compounds.
Bonded phases are used in capillary columns because they provide a dramatic increase
in column quality. To truly bridge the gap between traditional packed columns and cap-
illary columns, it was necessary to develop bonded liquid phases for packed columns.
Packed column chromatographers can expect shorter conditioning times, lower bleed,
and longer column lifetimes by using Restek bonded phase packed columns.
Bonded phases also last much longer than nonbonded phases. Bonded phases are more
resistant to oxidation than nonbonded phases because of the stronger intermolecular
forces produced by cross-linking. Because the material is thoroughly cross-linked, the
phase will not migrate or puddle, as often happens with nonbonded phases. Figure 1
shows a comparison of a bonded and a nonbonded methyl silicone column after 170
temperature cycles. The results show the impressive durability of bonded phases.
Equivalent Liquid Phases
BP-1, CC-1, CP-Sil 5CB, DB-1, DC-200, GE-SF-96, HP-1, HP-101, OV-1, OV-101,
Rtx-1
RSK-150, RH-1, SE-30, SP-2100, SPB-1, UCC W-98
Rtx-5
BP-5, CB-5, CC-5, CP-Sil 8CB, DB-5, HP-5, OV-73, SE-52, SE-54, SPB-5, Ultra-5
Stabilwax
BP-20, CP-Wax, CW-20, DB-Wax, HP-Innowax, PE-Wax, Supelcowax-10
Website :
E-mail :
TelNo : 03 9762 2034 . . . in AUSTRALIA
Mar 2011
