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The preparation and storage of ultra high purity hexane for solvent effect gas chromatographic analysis
Dissertation (MSc (Chemistry))--University of Pretoria, 1992.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2022
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| _version_ | 1867613508235952128 |
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| 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 | © 2020 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 | Dissertation (MSc (Chemistry))--University of Pretoria, 1992. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/85490 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:15.598Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| 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:2263/85490 The preparation and storage of ultra high purity hexane for solvent effect gas chromatographic analysis Rohwer, Egmont Richard Chen, Guay-chuan UCTD Storage High purity Dissertation (MSc (Chemistry))--University of Pretoria, 1992. The newly developed dynamic solvent effect (DSE) sampling technique for capillary gas chromatography requires ultra-pure solvents for optimum performance. Hexane, the most popular sol vent for this concentration technique, is not available commercially in a grade of the required purity. Trace impurities present in the freshly purified solvent and those originating from laboratory glassware, storage vials and decomposition of the hexane itself, can lead to grave errors in analytical results after concentration. A goal was set to remove flame ionization detectable impurities less volatile than heptane to levels of 1 ppl09 (m/v) per component and to maximize the shelf life of the purified hexane. Methods investigated for purification include fractional distillation (with simple packed columns and with spinning band columns) as well as frontal elution gas and liquid chromatography. The storage of purified hexane was studied in borosilicate glass flasks with ground glass stoppers and borosilicate glass vials with various cap liner materials, under different conditions of temperature and light. A cheap, simple, and reliable technique for preparing and storing ultra-high purity hexane was developed and tested. The results could help to introduce the DSE technique to other laboratories specializing in trace analysis. Other analytical techniques that rely on achieving high sensitivity by evaporative concentration of hexane solutions could also benefit from the findings. Chemistry MSc (Chemistry) Unrestricted 2022-05-17T11:21:51Z 2022-05-17T11:21:51Z 2021/09/09 1992 Dissertation * https://repository.up.ac.za/handle/2263/85490 en © 2020 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 University of Pretoria |
| spellingShingle | UCTD Storage High purity The preparation and storage of ultra high purity hexane for solvent effect gas chromatographic analysis |
| title | The preparation and storage of ultra high purity hexane for solvent effect gas chromatographic analysis |
| title_full | The preparation and storage of ultra high purity hexane for solvent effect gas chromatographic analysis |
| title_fullStr | The preparation and storage of ultra high purity hexane for solvent effect gas chromatographic analysis |
| title_full_unstemmed | The preparation and storage of ultra high purity hexane for solvent effect gas chromatographic analysis |
| title_short | The preparation and storage of ultra high purity hexane for solvent effect gas chromatographic analysis |
| title_sort | preparation and storage of ultra high purity hexane for solvent effect gas chromatographic analysis |
| topic | UCTD Storage High purity |
| url | https://repository.up.ac.za/handle/2263/85490 |