Capillary tube injection interface device for nanoparticle aerosol mass spectrometer

Abstract

The invention discloses a capillary tube injection interface device for a nanoparticle aerosol mass spectrometer. The device comprising a general-purpose connector, a buffer chamber, a capillary tube, a focusing lens and a differential chamber, wherein the general-purpose connector, the buffer chamber, the capillary tube, the focusing lens and the differential chamber are successively connected. The general-purpose connector is provided with an aerosol inlet and a current-limiting hole, wherein the aerosol inlet and the current-limiting hole are connected with an aerosol particle pretreatment instrument. The capillary tube which is connected with the buffer chamber, positioning ceramic, a positioning screw, the focusing lens on the rear side of the capillary tube, an insulation straight cylinder which fixes the focusing lens and the positioning ceramic, and a differential chamber outlet in the rear end of the focusing lens are arranged in the differential chamber. The positioning ceramic and the positioning screw are used for fixing the capillary tube. Voltage is applied on the surface of the capillary tube. The influence of Brownian motion in nanoparticle transport is compensated through the action of an electric field, so that charged nanoparticles can converge on the axis of the capillary tube. The gas accompanying matters of the charged nanoparticles can be removed by a vacuum pump which is connected with the differential chamber. The focusing lens can further converge the charged nanoparticles. Atmospheric pressure sample injection and high efficiency transmission of the nanoparticles are realized.

Description

technical field [0001] The invention belongs to the technical field of aerosol mass spectrometry, and in particular relates to a mass spectrometer interface device for capillary atmospheric pressure sampling and transmission of an aerosol mass spectrometer for on-line detection of chemical components of nanoparticles (diameter less than 50nm). Background technique [0002] Aerosol particles are an important part of air pollutants. The number density of nanoparticles in the atmosphere is very large, and its proportion can account for more than 80% of the total number of particles. They absorb and scatter light in the atmosphere to reduce the visibility of the atmosphere, form smog, and affect air quality and global climate; and because of their The specific surface area is large, and there are many harmful substances adsorbed per unit area, which are more likely to be deposited in the human respiratory and cardiovascular systems, endangering people's health. At the same time...

AI Technical Summary

Problems solved by technology

However, due to the influence of Brownian motion, the transmission efficiency of aerodynamic lenses for nanoparticles with a particle size of less than 60nm is very low, so it cannot be used as a mass spectrometer sampling device for nanoparticles

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