Equipment for detecting sample gas and method for detecting sample gas by flame ionization detector

Abstract

The invention relates to equipment for detecting sample gas. The equipment comprises a flame ionization detector, wherein the flame ionization detector comprises a sample gas inlet, a combustible gasinlet and a combustion-aid gas inlet; in the flame ionization detector, sample gas flowing into the flame ionization detector is ionized under the action of a flame generated by combustible gas and combustion-aid gas, so as to generate a signal for chemically analyzing the sample gas; the equipment also comprises a compensation gas supply device to provide compensation gas to the flame ionizationdetector, so as to eliminate or relieve the disturbance caused by oxygen in the sample gas; and the compensation gas is oxygen-containing gas. The invention further provides a method for detecting thesample gas by the flame ionization detector. By the equipment and the method, the problem of disturbance of the oxygen in the oxygen-containing sample gas to a detection result can be solved.

Description

technical field [0001] The invention relates to a device for detecting sample gas, which includes a flame ionization detector. In addition, the present invention also relates to a method for detecting sample gas by means of a flame ionization detector, wherein the sample gas to be detected usually contains oxygen components. Background technique [0002] Gas chromatography analysis is one of the important modern analysis methods. On the one hand, it has the characteristics of high separation efficiency, fast analysis speed, accurate quantitative results, and easy automation. On the other hand, when it is combined with a mass spectrometer, computer, etc. for gas-mass coupling analysis, it can perform qualitative and quantitative analysis of complex multi-component mixtures. Therefore, gas chromatographic analysis instruments are increasingly widely used in petrochemical, pharmaceutical, biochemical, environmental science and other fields, and become an indispensable and imp...

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Problems solved by technology

[0006] However, when the hydrogen flame ionization detector for gas chromatography is applied to sample gas detection in the atmosphere or in places where the oxygen concentration is uncertain, the sensitivity will vary due to the oxygen content in the sample gas.

In addition, the degree of ionization of functional groups by flame combustion will also cause differences in sensitivity, resulting in deviations in the final test results

For example, it has been found in experiments that due to the presence of oxygen in the sample gas, the measurement deviation may be as high as 3%-20% of full scale, but obviously such deviation is not acceptable in this field

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