GC / MS Laborgeräte > Gebrauchte & günstige GC / MS [en]

20136

Thermo Focus DSQ
Thermo GC/MS system Focus DSQ. With GC Triplus DUO Focus. Without further detector. Split/splitless injector. Calculator. Printer. TFT monitor. Cleaning cartridge for gases. Edwards vacuum pump. TriPlus sampler consisting of: Tray TP-202 with 54 positions, Tray TP-401 with 5 positions, Holder TP-303, AC adapter TP-100, an agitator with HS-tower TP-112, Standard AS-tower TP-111, stands for mounted on the GC, syringes and TP-501 TP-502. 230 V. 50 Hz. CE marked. Signe CE

Product group: GC / MS

Stock unit The device is in our stock, however, has to be inspected by our technicien, in order to be able to guarantee complete function. Therefore the delivery time is generally four to six weeks.

The device is in our stock, however, has to be inspected by our technicien, in order to be able to guarantee complete function. Therefore the delivery time is generally four to six weeks.

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Price: 29,800.00 €
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19890

Finnigan SSQ 7000
Finnigan Quadrupol mass spectrometer SSQ 7000. With Hewlett Packard GC 5890 II. Autosampler A200S. Gerstel KAS. Pfeiffer vacuum pump. Computer. Xcalibur software V.1.1, ICL V8.3 for control and evaluation on CD-ROM. WinNT operating system required. Device was previously in use in pharmaceutical research.

Product group: GC / MS

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Price: 25,000.00 €
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GC / MS

Gas chromatographs are used for the separation of mixtures with volatile components. The separation process of gas chromatography is based on multiplicative distribution between the mobile and the stationary phase of the mixture, which is carried by the mobile phase through the column. Because of its high efficiency in separation, it is possible to split very complex compounds into their individual components and to analyse them with a detector. Note, however, that gas chromatography concerns gas mixtures or non-decomposed evaporateable substances.

Construction of gas chromatographs

The architecture of a gas chromatographs can be described as follows. A gas chromatograph consists of a carrier gas supply which is filled with the mobile phase, an injector, a column, which is often made of metal or glass, has a length of 10 to 200 metres and is inside a temperable oven, a detector and a data evaluation device whose results a standard computer may display. The mobile phase of gas chromatography is represented by an inert gas, p. e. helium or nitrogen, the stationary phase is represented by adsorbing solids or absorbent liquids. Gas chromatographs can consequently be classified by either a packed column or a capillary column. The rate by which the substance is transported through the column is determined basically by the flowrate of the mobile phase. The function of the stationary phase in gas chromatography is now to separate the sample into its individual components. Capillary column and packed column may be distinguished by their stationary phase. The packed column of gas chromatographs contains a solid support material, coated with a thin, liquid film, i. e. the stationary phase. The capillary column, however, may in gas chromatography be either wall-coated (WCOT column), support-coated (SCOT column) or consist of porous-layer capillaries (PLOT column).

Detectors in gas chromatography

In gas chromatography, different detectors are applied, according to the substance to be examined. Often flame ionisation detectors, thermal ionic detectors, electron capture detectors, thermal conductivity detectors or other detectors are used, such as the mass spectrometer. Often, a combination of several detectors may also be applied.

Literature

http://de.wikipedia.org/w/index.php?title=Gaschromatographie&oldid=86925177 (called: 29.03.11).

http://www.chemgapedia.de/vsengine/vlu/vsc/de/ch/3/anc/croma/gc_detail1.vlu.html (called: 29.03.11).