An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes (C8–C30+)
The accurate analysis of stable carbon isotope ratios of individual n-alkanes in petroleum by gas chromatography isotope ratio mass spectrometry (GC-irMS) requires that the n-alkanes be separated from branched/cyclic hydrocarbons. Conventional separation methods include urea adduction or separation...
| Main Authors: | , , , |
|---|---|
| Format: | Journal Article |
| Published: |
Elsevier Science
2008
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/42950 |
| _version_ | 1848756557243744256 |
|---|---|
| author | Grice, Kliti de Mesmay, Romain Glucina, Andrew Wang, Sue Xuan |
| author_facet | Grice, Kliti de Mesmay, Romain Glucina, Andrew Wang, Sue Xuan |
| author_sort | Grice, Kliti |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The accurate analysis of stable carbon isotope ratios of individual n-alkanes in petroleum by gas chromatography isotope ratio mass spectrometry (GC-irMS) requires that the n-alkanes be separated from branched/cyclic hydrocarbons. Conventional separation methods include urea adduction or separation using different types of molecular sieves (5A, ZSM5). Although the molecular sieves procedures are well established, they generally require the use of hydrofluoric (HF) acid, a potentially hazardous material, to digest and release compounds trapped within the sieve. In this study, a simplified 5A method that avoids the use of HF acid has been developed to isolate n-alkanes ranging from n-C8 to at least n-C30 from a saturated petroleum hydrocarbon fraction. 12% cyclohexane in n-pentane was found to be a sufficient solvent in extracting most of the n-alkanes (>90%) in the n-C8 to n-C30 range from the sieve. The new 5A sieve procedure is a rapid and safer method for extracting n-alkanes from petroleum to yield fractions amenable for routine GC-irMS. |
| first_indexed | 2025-11-14T09:14:05Z |
| format | Journal Article |
| id | curtin-20.500.11937-42950 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:14:05Z |
| publishDate | 2008 |
| publisher | Elsevier Science |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-429502017-09-13T16:05:51Z An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes (C8–C30+) Grice, Kliti de Mesmay, Romain Glucina, Andrew Wang, Sue Xuan molecular sieving n-alkanes petroleum stable carbon isotopes The accurate analysis of stable carbon isotope ratios of individual n-alkanes in petroleum by gas chromatography isotope ratio mass spectrometry (GC-irMS) requires that the n-alkanes be separated from branched/cyclic hydrocarbons. Conventional separation methods include urea adduction or separation using different types of molecular sieves (5A, ZSM5). Although the molecular sieves procedures are well established, they generally require the use of hydrofluoric (HF) acid, a potentially hazardous material, to digest and release compounds trapped within the sieve. In this study, a simplified 5A method that avoids the use of HF acid has been developed to isolate n-alkanes ranging from n-C8 to at least n-C30 from a saturated petroleum hydrocarbon fraction. 12% cyclohexane in n-pentane was found to be a sufficient solvent in extracting most of the n-alkanes (>90%) in the n-C8 to n-C30 range from the sieve. The new 5A sieve procedure is a rapid and safer method for extracting n-alkanes from petroleum to yield fractions amenable for routine GC-irMS. 2008 Journal Article http://hdl.handle.net/20.500.11937/42950 10.1016/j.orggeochem.2007.12.009 Elsevier Science restricted |
| spellingShingle | molecular sieving n-alkanes petroleum stable carbon isotopes Grice, Kliti de Mesmay, Romain Glucina, Andrew Wang, Sue Xuan An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes (C8–C30+) |
| title | An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes (C8–C30+) |
| title_full | An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes (C8–C30+) |
| title_fullStr | An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes (C8–C30+) |
| title_full_unstemmed | An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes (C8–C30+) |
| title_short | An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes An improved and rapid 5A molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes (C8–C30+) |
| title_sort | improved and rapid 5a molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes an improved and rapid 5a molecular sieve method for gas chromatography isotope ratio mass spectrometry of n-alkanes (c8–c30+) |
| topic | molecular sieving n-alkanes petroleum stable carbon isotopes |
| url | http://hdl.handle.net/20.500.11937/42950 |