Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Comprehensive two-dimensional supercritical fluid and gas chromatography (SFCxGC)
Thesis (PhD)--University of Pretoria, 2003.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Published: |
University of Pretoria
2013
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613598099963904 |
|---|---|
| access_status_str | Open Access |
| author2 | Rohwer, Egmont Richard |
| author_browse | Rohwer, Egmont Richard |
| author_facet | Rohwer, Egmont Richard |
| collection | Thesis |
| dc_rights_str_mv | © 2003, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Thesis (PhD)--University of Pretoria, 2003. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/23155 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:38:41.391Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/23155 Comprehensive two-dimensional supercritical fluid and gas chromatography (SFCxGC) Rohwer, Egmont Richard ventandre@gmail.com Venter, Andre Sfcxgc Modulation Petrol analysis Diesel analysis Supercritical fluid chromatography Fast temperature programmed gas chromatography Multidimensional chromatography Comprehensive chromatography Sfc Oxygenate analysis Essential oil analysis Modulator Fuel analysis UCTD Thesis (PhD)--University of Pretoria, 2003. A novel chromatographic method was devised that makes use of the superb group separation power of normal phase supercritical fluid chromatography (SFC) combined with a fast second separation by a resistively heated gas chromatograph (GC). The SFC was operated isothermally with stopped flow to provide the time required for the GC analysis. The GC analysis had a typical cycle time of 1 minute. During this time the GC column was independently heated at a rate of 450°C/min to 250°C and actively cooled down again to -50°C before the next GC injection takes place. This was achieved with an in-house designed, resistively heated, temperature programmable gas chromatograph. Various temperature measurement circuits were also evaluated. An interface was developed that allows transfer between the SFC and the GC in such a way that the entire eluent from the first separation is analysed by the second separator. Chromatographic resolution was not lost during the transfer process from the first to the second separation stages. The interface also allows for the exchange of the carrier gas used in the second gas chromatographic separation to provide for the maximum separation speed. In the first separation, a silica gel packed column and the novel application of a silica gel porous layer open tubular capillary column was used for SFC group separation. The SFCxGCftp was applied to petrochemical samples and essential oils and the results were compared to that obtained with a commercially available GCxGC system. Chemistry unrestricted 2013-09-06T14:40:29Z 2003-04-17 2013-09-06T14:40:29Z 2003-02-15 2003 2003-03-13 Thesis Venter, A 2003, Comprehensive two-dimensional supercritical fluid and gas chromatography (SFCxGC), PhD thesis, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/23155 > http://hdl.handle.net/2263/23155 http://upetd.up.ac.za/thesis/available/etd-03132003-161136/ © 2003, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf University of Pretoria |
| spellingShingle | Sfcxgc Modulation Petrol analysis Diesel analysis Supercritical fluid chromatography Fast temperature programmed gas chromatography Multidimensional chromatography Comprehensive chromatography Sfc Oxygenate analysis Essential oil analysis Modulator Fuel analysis UCTD Comprehensive two-dimensional supercritical fluid and gas chromatography (SFCxGC) |
| title | Comprehensive two-dimensional supercritical fluid and gas chromatography (SFCxGC) |
| title_full | Comprehensive two-dimensional supercritical fluid and gas chromatography (SFCxGC) |
| title_fullStr | Comprehensive two-dimensional supercritical fluid and gas chromatography (SFCxGC) |
| title_full_unstemmed | Comprehensive two-dimensional supercritical fluid and gas chromatography (SFCxGC) |
| title_short | Comprehensive two-dimensional supercritical fluid and gas chromatography (SFCxGC) |
| title_sort | comprehensive two dimensional supercritical fluid and gas chromatography sfcxgc |
| topic | Sfcxgc Modulation Petrol analysis Diesel analysis Supercritical fluid chromatography Fast temperature programmed gas chromatography Multidimensional chromatography Comprehensive chromatography Sfc Oxygenate analysis Essential oil analysis Modulator Fuel analysis UCTD |
| url | http://hdl.handle.net/2263/23155 http://upetd.up.ac.za/thesis/available/etd-03132003-161136/ |