Calibration system and method based on nitric acid chemical ionization time-of-flight mass spectrometer

Abstract

The invention discloses a calibration system based on a nitric acid chemical ionization time-of-flight mass spectrometer. The system comprises first, second, third, fourth and fifth gas mass flow controllers, a water bath foaming device and a sulfuric acid generation reaction chamber, one end of the first gas mass flow controller is connected with standard-concentration sulfur dioxide gas, and theother end is connected with a main path inlet of the sulfuric acid reaction generation chamber; one ends of the second, third and fourth gas mass flow controllers are respectively connected with high-purity nitrogen; the other end of the second gas mass flow controller is connected with a branch inlet of the sulfuric acid generation reaction chamber; the other ends of the third and fourth gas mass flow controllers are respectively connected with the main path inlet of the sulfuric acid generation reaction chamber, one end of the fifth gas mass flow controller is connected with high-cleanliness air, the other end of the fifth gas mass flow controller is connected with the main path inlet of the sulfuric acid generation reaction chamber, and the output end of the sulfuric acid generation reaction chamber is connected with a calibrated instrument. The invention further provides a calibration method which can better control the generation concentration of a sulfuric acid standard sample.

Description

technical field [0001] The invention belongs to the application field of mass spectrometers, and more specifically relates to a calibration system and method for a time-of-flight mass spectrometer based on nitric acid chemical ionization. Background technique [0002] Aerosol refers to a relatively stable suspension system formed by liquid or solid particles uniformly distributed in the atmosphere. Aerosol can be divided into organic aerosol and inorganic aerosol according to its composition. Divided into primary organic aerosol (Primary organic aerosol, POA) and secondary organic aerosol (Secondary organic aerosol, SOA). POA generally refers to organic aerosols directly discharged into the atmosphere and semi-volatile organic compounds that can be directly condensed under atmospheric conditions; SOA refers to organic aerosols generated by volatile organic compounds in the atmosphere through various chemical reactions and gas-solid conversion processes. [0003] Aerosols no...

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Problems solved by technology

[0015] Aiming at the problem in the prior art that the system calibration of chemical ionization mass spectrometer cannot control the concentration of generated OH radicals, the present invention provides a calibration system and calibration method based on nitric acid chemical ionization typing time mass spectrometer

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