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Digitale Medien

Quartz Rod Coated with Modified Silica Gel as a Source of CO and CO2 for Standard Gaseous Mixtures (1998)

Prokopowicz, Magdalena ; Luboch, Elżbieta ; Biernat, Jan F. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 21 (1998), S. 303-307

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ISSN: 0935-6304

Schlagwort(e): gas chromatography ; modified silica gel ; gaseous standard mixtures ; FID calibration ; carbon monoxide and carbon dioxide ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: ---Quartz rods coated with a thin layer of chemically modified silica gel have been used for the generation of a two-component gaseous standard mixture containing carbon monoxide and carbon dioxide. A new method based on thermal decomposition of immobilized compounds chemically bonded to the surface of silica gel has been used in the generation process. The oxalic acid moiety bonded to the glycydoxypropylsilylated surface of silica gel underwent decarbonylation and decarboxylation at 300°C, yielding carbon monoxide and carbon dioxide. On-line connection of a thermal desorber with the GC/FID enabled calibration of the detector following the process of methanization of CO and CO2. The following amounts of CO and CO2 were generated per unit length of the rod: 15.1 × 10-8 Mol cm-1 (RSD = 5.71%) for CO and 34.2 × 10-8 Mol cm-1(RSD = 5.16%) for CO2.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

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Digitale Medien

Solventless Sample Preparation Techniques in Environmental Analysis (2000)

Namieśnik, Jacek ; Wardencki, Waldemar

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 23 (2000), S. 297-303

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ISSN: 0935-6304

Schlagwort(e): Sample preparation ; gas extraction techniques ; membrane-type techniques ; water analysis ; soil analysis ; gas chromatography ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: ---This review focuses on the role of so-called solventless methods of sample preparation in contemporary environmental analysis. The basic classification of this group of methods as well as the principal features and advantages of the techniques in current use are discussed.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

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Digitale Medien

Studies on the Use of Commercial Capillary Gas Chromatographic Columns as Diffusion Denuders (2000)

Dudek, Marta ; Wolska, Lidia ; Pilarczyk, Michaeł ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 23 (2000), S. 449-454

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ISSN: 0935-6304

Schlagwort(e): Denuders ; isolation and enrichment ; analysis ; volatile organic compounds ; partition coefficients Kfs ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: ---The possibility of using a piece of gas chromatographic capillary column as a tubular denuder for isolation and enrichment of organic pollutants present in air was studied. The partition coefficients (Kfs) of typical organic pollutants (benzene, chlorobenzene, toluene) between the gaseous phase and the denuder sorption layer were determined and effects of analyte concentration in the gaseous phase and gas flow rate on partitioning were studied. The partition coefficients were found to be constant in the studied range of concentration and gaseous mixture flow rate. A piece of a capillary column coated with polydimethylosiloxane can be used as a tubular denuder.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

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