Constant volume continuous sample injector applied to ion mobility spectrometry

Abstract

The invention relates to a sample injector of a constant volume ion mobility spectrometry. The sample injector comprises a multi-way valve, a multi-way valve control device, a sampling tube, a sample tube, a carrier gas tube and a sampling pump, wherein the sampling tube is connected with a sampling hole of the multi-way valve; and the carrier gas tube is connected with a carrier gas hole of the multi-way valve. Under the control of the multi-way valve control device, sample gas is collected by the sampling pump, is stored in the sampling tube after passing through the sampling tube and then is driven by carrier gas in the carrier gas tube to enter the ion mobility spectrometry to be analyzed to acquire a signal of a sample and an analysis result. The sample injector is used for the ion mobility spectrometry, can accurately control the sample size of the sample, effectively prevents the sample from polluting the high-sensitivity ion mobility spectrometry during on-line analysis, has high working efficiency, and contributes to the application and the popularization of an on-line ion mobility spectrometry.

Description

technical field [0001] The invention relates to a sample injector for ion mobility spectrometry, in particular to a continuous sampling technique. Using this continuous sampling technique for ion mobility spectrometry can effectively prevent high-sensitivity ion mobility spectrometry from being brought pollution, which is conducive to the industrialization of online ion mobility spectrometers. Background technique [0002] The injector is one of the key technologies of ion mobility spectrometry. Commonly used ion mobility spectrometry sampling methods include: direct inhalation method, membrane sampling, thermal analysis, laser analysis, etc. The sampling methods commonly used in real-time online detection are: direct suction method and membrane sampling method. The direct inhalation method is to bring the ion mobility spectrometer inlet close to the sample, and directly inhale the air near the sample into the ion mobility spectrometer for analysis. However, due to the in...

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Problems solved by technology

However, due to the influence of polar molecules such as water molecules and ammonia in the air, the ion cluster reaction is relatively serious, which reduces the resolution of the spectrum. When this method is applied to online detection, it is easy to contaminate the transfer tube.

Adding a membrane sampling method with a layer of porous film between the interface of ion mobility spectrometry and the atmosphere can remove most of the water molecules and ammonia molecules in the inhaled gas, limit the formation of clusters and improve the resolution of the instrument, and can effectively Prevents other impurities from entering the transfer tube, but membrane injection can reduce sensitivity and increase instrument response time

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