Ion mobility spectrometer based on ion sweep type membrane sample introduction

Abstract

The invention designs an ion mobility spectrometer based on ion sweep type membrane sample introduction. The ion mobility spectrometer comprises a membrane sample introduction device, an ionization source, an ionization reaction region, an ion gate, an ion mobility region, a grid, and an ion receiving pole. The adopted technical means comprises the following steps: the membrane sample introduction device is located in the ionization reaction region; reactive ions generated under the action of the ionization source sweep the membrane surface exposed on the ionization reaction region; and an electric field is arranged in front of and behind the membrane device. Thus, the membrane sample introduction device sample transmittance and transmittance speed and instrument response speed and sensitivity can be effectively improved.

Description

technical field [0001] The invention relates to an ion mobility spectrometer based on ion purging type membrane sampling, which can effectively improve the permeability and transmission speed of the membrane sampling device to samples, and the response speed and sensitivity of the instrument. Background technique [0002] Ion Mobility Spectrometry (IMS) technology is a separation and detection technology that appeared in the 1970s. Compared with traditional technologies such as mass spectrometry and chromatography, it has the characteristics of simple structure, high sensitivity, and fast analysis speed. It is suitable for Field use. Ion mobility spectrometer is mainly composed of ion source, ion gate, migration region and detector. The ion source makes the sample molecules, N 2 , O 2 When ionized with water vapor, the generated ions can easily react with molecules to obtain a variety of product ions. Driven by the electric field, the ions enter the migration region thro...

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Problems solved by technology

In general, after passing through the semipermeable membrane, the sample molecules need to leave the surface of the membrane under the action of the carrier gas. However, the carrier gas at a small flow rate cannot take away the sample molecules on the membrane surface in time, resulting in a gradual decrease in the concentration difference between the inside and outside of the membrane. , which reduces the transmittance and velocity of the sample; the carrier gas with too large flow rate will dilute the sample, thereby reducing the sensitivity of the instrument

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