Device in a gas flow cell and a method of analyzing chemical...

Measuring and testing – Gas analysis – Gas chromatography

Reexamination Certificate

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C356S246000, C356S437000

Reexamination Certificate

active

06305213

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a device in a gas flow cell for the analysis of chemical substances by means of spectrophotometry.
The present invention also relates to a method of analyzing chemical substances.
DESCRIPTION OF RELATED ART
That part of analytical chemistry dealing with the separation and detection of mixtures of organic substances has been dominated since the nineteen-sixties by gas chromatography. In recent years development has tended towards combining gas chromatography (GC) with some qualitative method of analysis such as mass spectroscopy (MS), IR spectrophotometry (IR) or UV spectrophotometry (UV). The advantage with these combinations resides primarily in the fact that they make it possible to identify the substances separated by means of the gas chromatograph. Furthermore, detection/ identification can be rendered specific by having the detector give a reading for certain groups of substances, for example aldehydes.
U.S. Pat. No. 4,668,091 shows a gas flow cell for the analysis of chemical substances by spectrophotometry. The gas flow cell has an elongated, cylindrical body. It comprises two longitudinal ducts, connected to one another by a passage. One of the ducts comprises a separation column and at its first end has connections for the introduction of a carrier gas and for injection of the substances. The carrier gas and the substances form a flow through the separation column duct and leave this at its second end. The second duct is a light guide duct, which the flow from the separation column duct enters via the passage at a first end and leaves through an outlet at the second end of the light duct. Furthermore two gas-tight windows are arranged essentially parallel to one another at respective ends of the light duct, the windows being transparent for radiation used in the analysis.
The above-mentioned device according to the prior art is characterised by short analysis times, a good capability for separating out specific constituents and a high test capacity.
SUMMARY OF THE INVENTION
According to one embodiment of the present invention, a device is created in a gas flow cell for the analysis of chemical substances by spectrophotometry.
According to another embodiment of the present invention a method is created for the analysis of chemical substances.
The device according to the invention in the gas flow cell according to the present invention has several advantages. One important advantage is that, in addition to having the features characteristic of gas flow cell devices according to the prior art, it also has a good capability for separating the constituents of complex compounds. Other advantages are the fact that the device is easy to handle and that the capability for separating the constituents of complex compounds can be obtained without converting instruments.


REFERENCES:
patent: 2972246 (1961-02-01), Reinecke et al.
patent: 3869214 (1975-03-01), Egli et al.
patent: 4440013 (1984-04-01), Adams
patent: 4588893 (1986-05-01), Vidrine et al.
patent: 4668091 (1987-05-01), Lagesson et al.
patent: 0187 306 (1986-07-01), None
patent: 56087843-A (1981-07-01), None
International Search Report for PCT/SE98/01589.

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