Mass spectrometry combined device for directly analyzing aerosol on line

Abstract

The invention discloses a mass spectrometry combined device for directly analyzing aerosol on line, and relates to the technical field of mass spectrum combined devices. The mass spectrum combined device comprises a main body, wherein the main body comprises an inner-layer pipeline and an outer-layer pipeline which are coaxially arranged; a partition plate is arranged on the outer-layer pipeline and divides the outer-layer pipeline into two parts which are not communicated with each other; an aerosol inlet is formed in the side wall of one end of the outer-layer pipeline, a solvent inlet is formed in the position, which is between the aerosol inlet and the partition plate, on the side wall of the outer-layer pipeline, a carrier gas inlet is formed in the side wall of the other end of the outer-layer pipeline, and the carrier gas inlet and the solvent inlet are formed in the two sides of the partition plate; and the aerosol inlet and the solvent inlet are both communicated with the inner-layer pipeline. Aerosol in the atmosphere is enabled to be mixed with the solvent by controlling the flow rate of the carrier gas, and the mixture is jetted into an electrospray ionization mass spectrometer through the inner-layer pipeline, so that direct online analysis on the aerosol by utilizing the existing electrospray ionization mass spectrometer is realized.

Description

Technical field [0001] The invention relates to the technical field of mass spectrometry devices, in particular to a mass spectrometry device for direct online analysis of aerosols. Background technique [0002] Atmospheric aerosols have very complex physical and chemical properties, which have a very important impact on the environmental climate, regional air quality, and human health. On the one hand, the complexity of aerosols is reflected in the extremely wide range of particle size, ranging from a few nanometers to millimeters, and the chemical composition can be a mixture of a variety of primary emission and secondary formation substances, and due to the relatively large comparison of aerosol particles Area, so its composition is extremely unstable, and it will continue to change with time, weather and other factors. How to perform accurate and effective analysis of aerosol chemical components, especially for the rapid online identification of organic components in particu...

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Problems solved by technology

In addition, during the process from off-line sampling to pre-treatment, the aerosol itself may have undergone chemical aging and secondary reactions, resulting in analysis results that cannot represent the state of the original sample

[0005] The current common dedicated aerosol on-line analysis mass spectrometers, including aerosol mass spectrometer (AMS) and single particle mass spectrometer (SPMS), have their own problems: these technologies generally use electron bombardment ionization sources and laser ionization sources, and these hard ionization methods will The organic components to be analyzed become organic fragments, which pose serious challenges or even make it impossible to analyze the complex composition of aerosols

Electrospray extraction ionization source (EESI) can be combined with atmospheric pressure mass spectrometry to realize on-line analysis of aerosols, but the device is relatively complicated and difficult to install and debug, resulting in poor reproducibility

[0006] Pretreatment devices based on online thermal desorption also have many problems. First, the devices are expensive and difficult to be widely used

Second, the desorption method based on heating will easily cause some non-volatile organic compounds to be difficult to detect

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