An environmental aerosol direct sampling enrichment sampling device and quantitative analysis method

Abstract

An environmental aerosol direct sampling enrichment sampling device of the present invention comprises an environmental aerosol sampling module, an aerosol atomization and desolvation generation module, an aerosol condensation growth module, an aerosol number concentration enrichment module and a matrix gas removal module. The ambient aerosol sampling module includes a sampling port, a sampling pump and connecting pipelines; the sampling pump is preferably a diaphragm pump. The aerosol atomization and desolvation generation module includes a nebulizer, a mist chamber, a dryer and connecting pipelines. The nebulizer is used to atomize the standard solution to generate droplets, and the mist chamber is used to remove larger droplets. It is used to dissolve the mist droplets output from the mist chamber and remove the water vapor contained in them. In the present invention, the device is used as an aerosol sampling system in conjunction with ICP-MS, and the method can be used to quantitatively measure the mass sampling rate of the element to be measured in the environmental aerosol, and then divided by the sampling volume flow rate of the environmental aerosol, that is Get the mass volume concentration of the element to be measured.

Description

technical field [0001] The invention belongs to the intersecting field of mass spectrometer and aerosol analysis technology, and specifically relates to an environmental aerosol direct sampling and enrichment sampling device and a quantitative analysis method, which can be used as an aerosol sampling system for an inductively coupled plasma mass spectrometer. Rapid, sensitive and accurate online quantitative monitoring of aerosols. Background technique [0002] Aerosol refers to solid or liquid particles that are stably suspended in gas, and plays an important role in the fields of environmental climate, medicine and health, semiconductor electronics, national security, etc. Monitoring the composition, concentration and change trend of aerosol is an important Basis for research and control. Inductively coupled plasma mass spectrometry (ICP-MS) is a powerful aerosol monitoring analysis method, which can be used for aerosol offline monitoring and online monitoring. When perf...

AI Technical Summary

Problems solved by technology

[0006] 1) In order to ensure the effect of ventilation, the flow rate of aerosol flowing through a single set of gas displacer should not be greater than 250ml / min. If the sampling flow rate of ambient aerosol is 1L / min, at least four sets of gas displacers should be connected in parallel. increased complexity;

[0007] 2) Since the metal gas or atomized de-dissolved aerosol is introduced into the pipeline from the downstream outlet of the gas displacer, the transmission loss of the aerosol in the displacer cannot be corrected, and the quantitative analysis cannot be fully realized. The online monitoring results are better than the offline sampling monitoring results low

Images