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Improved Techniques for Sampling and Sample Introduction in Gas Chromatography
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Analytical Chemistry.
2008 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Sampling and sample introduction are two key steps in quantitative gas chromatography. In this thesis, a development of a previously described sampling technique as well as a novel concept for sample introduction in gas chromatography are presented. The thesis is based on two papers.

Paper I describes a method for preparing physically mixed polymers for use as sorbent phases in open tubular trapping of gaseous analytes. The concept is based on mechanical disintegration and mixing of solid or liquid poly(ethylene glycol), PEG, into poly(dimethylsiloxane), PDMS, in a straightforward manner. The resulting mixture exhibits a higher affinity towards polar analytes, as compared to pure PDMS.

Paper II describes a novel approach to liquid sample introduction with the split/splitless inlet, used in gas chromatography. Classical injection techniques struggle with discrimination of high boiling analytes and poor repeatability of the injected amount of analytes. The presented injection technique utilizes high voltage to obtain a spraying effect of the injected liquid. The spraying effect can be achieved with a cold needle, which is unprecedented for gas chromatographic injections. The cold needle spraying results in highly repeatable injections, free from discrimination of high boiling analytes.

Place, publisher, year, edition, pages
Stockholm: KTH , 2008. , 32 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2008:40
Keyword [sv]
Gaskromatografi, Provupparbetning, Provintroduktion
National Category
Analytical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-4744ISBN: 978-91-7178-978-5 (print)OAI: oai:DiVA.org:kth-4744DiVA: diva2:13747
Presentation
2008-05-28, E2, E-huset, Lindstedtsvägen 3, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101105Available from: 2008-05-13 Created: 2008-05-13 Last updated: 2010-11-05Bibliographically approved
List of papers
1. Mixed sorbent phases for thick film open tubular traps
Open this publication in new window or tab >>Mixed sorbent phases for thick film open tubular traps
2009 (English)In: Journal of Chromatographic Science, ISSN 0021-9665, E-ISSN 1945-239X, Vol. 47, no 4, 297-303 p.Article in journal (Refereed) Published
Abstract [en]

In this work, we present a technique for the preparation of tailor-made sorbent phases for thick film open tubular traps. Solid or liquid polymers are dispersed in a polydimethylsiloxane (PDMS) pre-polymer, which is cross-linked in situ after coating. The technique is evaluated by preparing thick film open tubular traps with PDMS containing solid or liquid poly(ethylene glycol) (PEG). A significant increase in retention for polar analytes is observed, even when only 7.5% PEG is present. The increase in retention for 3-chloro-1,2-propanediol is more than tenfold. The preparation method is simple and no solvents are required. Also, the concept provides great flexibility in terms of phase composition.

Keyword
CAPILLARY GAS-CHROMATOGRAPHY, SORPTIVE ENRICHMENT, THERMAL-DESORPTION, ORGANIC-COMPOUNDS, AQUEOUS SAMPLES, GASEOUS SAMPLES, TRACE ANALYSIS, FUSED-SILICA, EXTRACTION, WATER
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-8429 (URN)000265038000007 ()2-s2.0-65949115715 (Scopus ID)
Note
QC 20100922. Uppdaterad från Manuskript till Artikel (20100922).Available from: 2008-05-13 Created: 2008-05-13 Last updated: 2017-12-14Bibliographically approved
2. A novel injection technique for the split/splitless gas chromatography inlet
Open this publication in new window or tab >>A novel injection technique for the split/splitless gas chromatography inlet
(English)Manuscript (Other academic)
National Category
Analytical Chemistry
Identifiers
urn:nbn:se:kth:diva-8430 (URN)
Note
QC 20101105Available from: 2008-05-13 Created: 2008-05-13 Last updated: 2010-11-05Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • sv-SE
  • Other locale
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Output format
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