Sample application device for a gas chromatograph

Details Sample application device for a gas chromatograph Sample application device for a gas chromatograph

1999-04-16

2001-06-12

Warden, Jill (Department: 1743)

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing liquid or solid sample

C422S068100, C422S307000, C436S155000

Reexamination Certificate

active

06245298

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a sample application device for a gas chromatograph.
DESCRIPTION OF THE RELATED ART
German Patent DE 196 53 406 C1 discloses a sample application device for a gas chromatograph, having an evaporator which can be cooled, can be heated in a temperature-controlled manner, is provided with a carrier-gas feed and has a valve head for holding an exchangeable sampling tube, a receiving chamber for the sampling tube, a column exit and, if appropriate, a splitter exit. This device is used to transfer substances which have been liberated from the sample material by thermodesorption to a capillary column (transfer column or separation column of a gas chromatograph) by means of carrier gas. A sample application device of this nature makes it possible to carry out decomposition-free gas-phase extraction with regard to solid samples, for example at ambient or, if appropriate, at elevated operating temperatures.
Furthermore, it is known to subject sample material to pyrolysis, with the products formed as a result of this pyrolysis being analyzed by gas chromatography. The pyrolysis takes place at substantially higher temperatures than decomposition-free gas-phase extraction, and is not decomposition-free; rather, the aim is to analyse decomposition or reaction products formed at high temperatures. However, it is not possible in this process to distinguish between substances which are released without decomposition at relatively low temperatures and those which are only formed during the pyrolysis.
SUMMARY OF THE INVENTION
It is an object of the invention is to provide a sample application device for a gas chromatograph which makes it possible to analyse the complete gas-phase stripping products of a sample by gas chromatography. It is a further object of the invention to provide a sample application device which permits the analysis of the stripping products of a sample obtained at suitably low temperatures through to products from this sample formed by thermal decomposition during the pyrolysis. It is still a further object of the invention to provide a sample application which permits the analysis of the stripping products of a sample obtained at suitably low temperatures through to products from this sample formed by thermal decomposition during the pyrolysis within one step.
A subject of the invention is a sample application device for a gas chromatograph, comprising:
an evaporator provided with a cooling device for cooling the evaporator and a heating device for heating the evaporator in a temperature-controlled manner, and further provided with a carrier-gas feed, a valve head for holding an exchangeable sampling tube, a receiving chamber for the sampling tube, and a column exit; and
a pyrolyzer tube coupled to the carrier-gas feed and held by the valve head,
wherein the pyrolyzer tube is arranged in the receiving chamber, and
wherein a heating coil is provided in the receiving chamber, into said heating coil the sampling tube is insertable and to which current is applicable by means of a heating conductor which is guided outwards through the valve head.
By using such a device, it is possible to analyze samples by gas chromatography both with regard to the substances formed during decomposition-free gas-phase stripping at suitably low temperatures and with regard to the products formed by thermal decomposition during pyrolysis, it being possible for this analysis to be carried out in a single arrangement in one step, in succession, on the same sample, so that it is possible to differentiate between the substances formed during decomposition-free gas-phase stripping and the pyrolysis decomposition products in the chromatogram. Moreover, it becomes possible to apply substances formed by decomposition-free gas-phase extraction and products formed by pyrolysis independently of one another.
Further objects, advantages and embodiments of the invention are evident from the following description.
The invention is explained in more detail below with reference to an exemplary embodiment illustrated in the appended drawings.


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patent: 4344917 (1982-08-01), Schorno
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patent: 6055845 (2000-05-01), Gerstel et al.
patent: 9853310 (1998-11-01), None

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