Gas chromatographic and mass spectrometric coupling interface and system as well as flow rate matching method

Abstract

The invention relates to a gas chromatographic and mass spectrometric coupling interface and a gas chromatographic and mass spectrometric coupling system as well as a flow rate matching method. The coupling interface comprises a sheath flow device, wherein the sheath flow device is provided with a chromatographic connector, a mass spectrometric connector and a carrier gas interface, of which the interiors can be communicated with each other; the chromatographic connector and the carrier gas interface are used for introducing a gas; the mass spectrometric connector is used for outputting the gas. According to the technical scheme of the invention, an interference removal gas is introduced as a carrier gas by utilizing the sheath flow device, so as to balance a difference value between a flow rate at a mass spectrometric sample inlet and a flow rate at an outlet of a chromatographic column; the problem that the flow rates of a mass spectrometric analyzer and a chromatographic separator are not matched is solved; the effect that a spectrogram which is obtained by analysis is caused to be inaccurate as the mass spectrometric analysis is limited by the gas flow rate of chromatographic analysis is improved.

Description

technical field [0001] The invention generally relates to the field of gas phase detection, in particular to a gas chromatography mass spectrometry interface, a system and a flow matching method. Background technique [0002] With the rapid development of the world economy, the damage caused by human activities to the earth cannot be ignored. Developed countries in the world have all experienced smog during the process of accelerated industrial development. Now, as the largest developing country, China's heavy industrial cities often suffer from smog. The generation of smog is not an overnight result, but caused by the continuous increase of industrial waste gas exceeding the self-purification ability of the environment. Therefore, in order to prevent the occurrence of heavily polluted weather, we should pay close attention to the changes in the concentration of atmospheric components, reasonably control the emission of harmful substances, and formulate targeted environment...

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Problems solved by technology

[0012] The purpose of the present invention is to provide a gas chromatography-mass spectrometry interface, system and flow matching method to balance the difference between the flow rate of the mass spectrometer inlet and the outlet flow of the chromatographic column, and solve the problem of the flow mismatch between the mass spectrometer and the chromatographic separator , to improve the inaccurate effect of the spectrum obtained from the analysis due to the limitation of the mass spectrometry analysis gas flow

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