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Questo cromatogramma potrebbe contenere analiti che sono sinonimi dei vostri parametri di ricerca.
Alkylate Standard on Rtx-DHA 50 by Method D5134-13
| Peaks | Kovats RI @ 35 °C | D5134-13 RI Comparison | Linear RI | D5134-13 RI Comparison | |
|---|---|---|---|---|---|
| 1. | Isobutane | -- | 367.3 | -- | -- |
| 2. | n-Butane | 400.0 | 400.0 | -- | -- |
| 3. | Isopentane | 475.0 | 475.0 | -- | -- |
| 4. | n-Pentane | 500.0 | 500.0 | -- | -- |
| 5. | 2,3-Dimethylbutane | 565.4 | 565.5 | -- | -- |
| 6. | 2-Methylpentane | 569.2 | 569.5 | -- | -- |
| 7. | 3-Methylpentane | 583.1 | 583.4 | -- | -- |
| 8. | 2,4-Dimethylpentane | 629.9 | 630.3 | -- | -- |
| 9. | 2,2,3-Trimethylbutane | 635.1 | 635.4 | -- | -- |
| 10. | 2-Methylhexane | 667.2 | 667.8 | -- | -- |
| 11. | 2,3-Dimethylpentane | 668.6 | 669.1 | -- | -- |
| 12. | 3-Methylhexane | 675.5 | 676.2 | -- | -- |
| 13. | 2,2,4-Trimethylpentane | 689.9 | 688.7 | -- | -- |
| 14. | 2,2,3-Trimethylpentane/2,5-dimethylhexane | 731.5* | 731.9 | -- | -- |
| 15. | 2,4-Dimethylhexane | 733.2* | 733.5 | -- | -- |
| 16. | 2,3,4-Trimethylpentane | 747.1* | 747.8 | -- | -- |
| 17. | 2,3,3-Trimethylpentane | 750.0* | 751.1 | 730.4* | 730.2 |
| 18. | 2,3-Dimethylhexane | -- | -- | 744.4* | 743.6 |
| 19. | 2-Methylheptane | -- | -- | 754.0* | 754.1 |
| 20. | 4-Methylheptane/3,4-dimethylhexane (isomer) | -- | -- | 756.3* | 756.0 |
| 21. | 3,4-Dimethylhexane (isomer) | -- | -- | 763.6* | 763.4 |
| 22. | 3-Methylheptane | -- | -- | 754.0* | 754.1 |
| 23. | 2,2,5-Trimethylhexane | -- | -- | 779.7* | 778.8 |
| 24. | 2,2,4-Trimethylhexane | -- | -- | 786.4* | 785.1 |
| 25. | 2,4,4-Trimethylhexane | -- | -- | 805.4 | 805.7 |
| 26. | 2,3,5-Trimethylhexane | -- | -- | 817.4 | 817.7 |
| 27. | 2,4-Dimethylheptane | -- | -- | 826.1 | 826.6 |
| 28. | 2,6-Dimethylheptane | -- | -- | 833.4 | 833.8 |
| 29. | 2,5-Dimethylheptane | -- | -- | 839.9 | 840.3 |
| 30. | 2,3,4-Trimethylhexane | -- | -- | 849.7 | -- |
| 31. | 2,3-Dimethylheptane | -- | -- | 860.0 | 860.4 |
| 32. | 2,4,6-Trimethylheptane | -- | -- | 878.6 | -- |
*Extrapolated from n-C6 and n-C7 or from n-C8 and n-C9
GC_PC1319
| Column | Rtx-DHA-50, 50 m, 0.20 mm ID, 0.50 µm (cat.# 10147) |
| Sample | ASTM D5134 qualitative reference alkylate standard (DCG Partnership I, LTD) |
| Injection | |
| Inj. Vol.: | 0.2 µL split (split ratio 200:1) |
| Liner: | Premium 4.0 mm ID Precision inlet liner w/ wool (cat.# 23305.5) |
| Inj. Temp.: | 200 °C |
| Oven | |
| Oven Temp.: | 35 °C (hold 30 min) to 200 °C at 2 °C/min |
| Carrier Gas | He, constant pressure |
| Linear Velocity: | 23 cm/sec |
| Detector | FID @ 250 °C |
| Make-up Gas Flow Rate: | 30 mL/min |
| Make-up Gas Type: | N2 |
| Hydrogen flow: | 40 mL/min |
| Air flow: | 370 mL/min |
| Instrument | Agilent 7890B GC |
| Notes | Understanding the hydrocarbon components in petroleum samples is useful for sample characterization, determining product quality, planning and modeling of refinery processes, and also for regulatory purposes. ASTM D5134-13 provides the composition of paraffin, naphthenes, and monoaromatic compounds up to n-C9 in petroleum naphthas, reformates, and alkalytes. This method is run using a long, narrow-bore column, which has a limited sample loading capacity. Therefore, high split is used and a small sample volume is injected. Restek’s Rtx-DHA-50 column is a good match for this analysis; retention index (RI) data are in agreement with the RI data provided in the method. |
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