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Digitale Medien

GC instrumentation for on-column injection of large volumes: Automated optimization of conditions (1995)

Munari, Fausto ; Colombo, Pier Albino ; Magni, Paolo ; [weitere]

New York, NY [u.a.] : Wiley-Blackwell

Journal of Microcolumn Separations 7 (1995), S. 403-409

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ISSN: 1040-7685

Schlagwort(e): large volume on-column injection ; partially concurrent evaporation ; early vapor exit ; software modeling evaporation process ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Improved instrumentation facilitates on-column injection of up to several hundreds of microliters onto GC capillary columns. It incorporates an autosampler with adjustable injection speed, a standardized precolumn system, an early vapor exit, and software that models evaporation of a given solvent at the flow and temperature conditions chosen by the user. The software calculates the appropriate injection speed, guides the autosampler correspondingly, and closes the vapor exit at a moment leaving in the precolumn the amount of unevaporated solvent that is selected by the user. © 1995 John Wiley & Sons, Inc.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/mcs.1220070413

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Digitale Medien

Performance and characteristics of a trace gas analyzer for the determination of volatile organic compounds in air (1996)

Munari, Fausto ; Mapelli, Gian Pietro ; Kotzias, Dimitrios ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 19 (1996), S. 333-338

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ISSN: 0935-6304

Schlagwort(e): Adsorptive enrichment/thermal desorption ; Microtrap ; VOC and PVOC analysis ; Humid air sample analysis ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: An instrument has been developed and tested for the continuous measurement of volatile organic compounds (VOC) in air. The system consists of a gas chromatograph equipped with a dedicated sampling device that allows the sample to be transferred to a cooled microtrap via sampling loops (10, 100, 250 ml) or via a direct pump transfer to the trap. The microtrap is placed in the chromatographic oven just below a modified split-splitless injector, allowing direct liquid injection for calibration of the system; the injector is in communication with the sampling valve equipped with the loop and the sampling pump. The system allows 24-hour sampling and analysis of a large number of VOC (up to 25 individual hydrocarbons ranging from C2—C9) and also polar volatile organic compounds PVOC. Thanks to the particular trap geometry, a minimum consumption of liquid nitrogen (between 150—300 ml) is needed for each analytical run and no water managing system is normally required for humid air samples.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240190606

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