System and method for real-time and on-line rapid mass spectrometry analysis on chemical compositions of sub-micron aerosol

The invention discloses a system and a method for real-time and on-line rapid mass spectrometry analysis on chemical compositions of sub-micron aerosol. The system comprises an SESI (Secondary Electrospray Ionization) source and a mass spectrometer, wherein the SESI source comprises a cavity, a sample inlet formed in the cavity, a waste gas outlet and a nano-liter ESI (Electrospray Ion); the cavity of the SESI source is connected with the mass spectrometer. The method for the real-time and on-line rapid mass spectrometry analysis on the chemical compositions of the sub-micrometer aerosol comprises the following steps: the nano-liter ESI (Electrospray Ion) generates a primary ion, the primary ion is ionized and enters the sub-micron aerosol of the cavity through the sample inlet to obtain an aerosol ion; the aerosol ion enters mass spectrometry detection to obtain a spectrogram, and the chemical compositions of the sub-micrometer aerosol are obtained according to spectrogram analysis. According to the method disclosed by the invention, the chemical compositions of the sub-micrometer aerosol can be efficiently determined in real time, so that the application prospect is huge.