ADV01-05_1-298

• 12 •

800-356-1688 •

www.restek.com

2005 vol. 1

Enhanced Rtx®-1PONA GC Column

Improves Detailed Hydrocarbon Analysis

Guaranteed Retention - Efficiency - Peak Symmetry - Selectivity

by Gary Stidsen, GC Columns Marketing Manager, and Barry Burger, Petroleum Applications Chemist

•Reduce analysis time by 30%!

•Selectivity specific for detailed hydrocarbon analysis (ASTM Method D-6730-0).

• Each column tested to meet method-specific resolution criteria.

•Unsurpassed peak symmetry for oxygenated compounds.

To meet the demanding resolution and retention

criteria in American Society for Testing and

Materials (ASTM) and Canadian General

Standards Board (CGSB) methodology for

detailed hydrocarbon analysis, Restek chemists

reformulated the Rtx

-1PONA column. The

enhanced column meets or exceeds all criteria

in these standardized methods, in 30% less

time: retention time for C13 is 97 minutes, using

helium as the carrier gas. Measured values for

retention (k), efficiency (n), peak symmetry, and

stationary phase selectivity (RI) are stringently

controlled, enabling us to guarantee perform-

ance and reproducibility from column to column.

To achieve critical resolutions in detailed hydro-

carbon analysis, a 5-meter 5% diphenyl/95%

dimethyl polysiloxane tuning column is connect-

Figure 2

Critical pairs of gasoline components resolved per ASTM specifications, using an

Rtx®-1PONA column.

Rtx

-1PONA, 100m, 0.25mm ID, 0.5µm (cat.# 10195) w/ Rtx

-5 tuning col-

umn, 2.62m, 0.25mm ID, 1.0µm, connected via Press-Tight

connector

(cat.# 20446)

Sample:

custom detailed hydrocarbon analysis (DHA) mix, neat

Inj.:

0.01µL, split (split ratio 150:1), 4mm cup inlet liner (cat.#

20709)

Inj. temp.:

200°C

Carrier gas: helium, constant flow

Linear velocity: 28cm/sec. (2.3mL/min.)

Oven temp.: 5°C (hold 15 min.) to 50°C @ 5°C/min. (hold 50 min.) to

200°C @ 8°C/min. (hold 10 min.)

Det.:

FID @ 250°C

1. ethanol

2. C5

3. tert-butanol

4. 2-methylbutene-2

5. 2,3-dimethylbutane

6. methyl tert-butyl ether (MTBE)

7. C6

8. 1-methylcyclopentene

9. benzene

10. cyclohexane

11. 3-ethylpentane

12. 1-tert-2-dimethylcyclopentane

13. C7

14. 2,2,3-trimethylpentane

15. 2,3,3-trimethylpentane

16. toluene

17. C8

18. ethylbenzene

19. p-xylene

20. 2,3-dimethylheptane

21. C9

22. 5-methylnonane

23. 1,2-methylethylbenzene

24. C10

25. C11

26. 1,2,3,5-tetramethylbenzene

27. naphthalene

28. C12

29. 1-methylnaphthalene

30. C13

Resolution (1-methylcyclo-

pentane/benzene): 1.28

Circles indicate

critical pairs that

must be resolved.

GC_PC00743

Figure 1

Sharp, symmetric peak for ethanol (gasoline oxygenate), using an Rtx®-1PONA column.

12 min.

Rtx

-1PONA, 100m, 0.25mm ID, 0.5µm (cat.# 10195)

w/ Rtx

-5 tuning column, 2.62m, 0.25mm ID, 1.0µm,

connected via Press-Tight

connector (cat.# 20446)

Sample:

custom detailed hydrocarbon analysis

(DHA) mix, neat

Inj.:

0.01µL, split (split ratio 150:1),

4mm cup inlet liner (cat.# 20709)

Inj. temp.:

200°C

Carrier gas:

helium, constant flow

Linear velocity:

28cm/sec. (2.3mL/min.)

Oven temp.:

35°C

Det.:

FID @ 250°C

1. ethanol

2. C5

tert

-butanol

4. 2-methylbutene-2

C5 efficiency: 613,596 total theoretical plates

k' (C5): 0.489

tert

-butanol skewness: 1.25

Resolution (

tert

-butanol/2-methylbutene-2): 5.60

GC_PC00743A

ed to the analytical column and adjusted to the

needed length through a series of trial analyses.

This work earned the Restek Innovations

chemists the Concluded Research Award, spon-

sored by DCG Partnership 1 Ltd., at the 2004

Gulf Coast Conference. When you use an Rtx

1PONA column, we think you'll agree that the

award is well justified.

Rtx®-1PONA Column

(fused silica)

(Crossbond

100% dimethyl polysiloxane)*

*Optimized phase for hydrocarbon analysis

ID df (µm)

temp. limits

100-Meter

0.25mm 0.50 -60 to 300/340°C 10195

$795

Rtx®-5PONATuning Column

(fused silica)

(Crossbond

5% diphenyl/95% dimethyl polysiloxane)

ID df (µm)

temp. limits

5-Meter

0.25mm 1.0 -60 to 330/340°C 10196

$75

2004

Concluded

Research

Award goes to

Barry Burger

The award was presented at the 2004 Gulf

Coast Conference, for Restek’s second gener-

ation Rtx

-1PONA capillary GC column for

detailed hydrocarbon analysis according to

American Society for Testing and Materials

and Canadian General Standards Board

methodology. For the full story, visit us online.

award-winning

innovation

Pittcon®

presentation

This information will be presented by Barry

Burger, Poster Session 10, Sunday afternoon,

February 27.

Reliable connections

made simple!

See page 22 for

information on

Vu2Union™

Connectors.