Ultrasonic atomization sample introduction volatile solvent assisting ionization low-pressure photo ionization mass spectrum device

Abstract

The invention relates to an ultrasonic atomization sample introduction volatile solvent assisting ionization low-pressure photo ionization mass spectrum device. The device comprises a mass spectrum mechanism. The mass spectrum mechanism comprises a mass spectrum room and a photo ionization room, wherein the mass spectrum room and the photo ionization room are adjacent to each other and are connected together. A rear sampling cone is arranged on one side wall of the mass spectrum room, a mass spectrum room vacuum pump connector is arranged on the other side wall of the mass spectrum room, an ion conveying system and a mass analyzer are arranged in the mass spectrum room, the rear sampling cone stretches into the photo ionization room, a front sampling cone is arranged on one side of the photo ionization room, a photo ionization room vacuum connector is arranged on the other side of the photo ionization room, and a vacuum ultraviolet light source is arranged on the top of the photo ionization room. The device further comprises an ultrasonic atomization mechanism, a heating and gasification mechanism and a volatile solvent introducing mechanism. Objects, not prone to volatilization, to be measured are directly sampled through ultrasonic atomization and heating and gasifying of desolventizing agents without preprocessing, and therefore flexible and fast mass spectrum analysis is achieved, and the device has wide application prospects in aspects like food, pesticides and environment fast mass spectrum analysis.

Description

technical field [0001] The invention belongs to the technical field of mass spectrometry, and in particular relates to a fast mass spectrometry device for difficult-to-volatilize, complex organic molecules and mixtures. Background technique [0002] Mass spectrometry is an important method for identifying molecular structures. A modern mass spectrometer is mainly composed of a vacuum system, a sampling system, an ion source, an ion optical system, a mass analyzer, a detector, and a data processing system. According to the structure and properties of the analytes, there are various ionization methods of mass spectrometry. Commercial mass spectrometers mainly have five ion sources, electron bombardment ionization, chemical ionization, electrospray ionization, atmospheric pressure photoionization and matrix-assisted laser desorption ionization; [0003] Vacuum ultraviolet photoionization is a method that uses vacuum ultraviolet light with a wavelength of less than 200nm to ion...

AI Technical Summary

Problems solved by technology

Atmospheric pressure photoionization sources cannot directly inject and analyze the analyte, and need to be used in conjunction with chromatography to pretreat and separate the analyte; secondly, air molecules and solvents under atmospheric pressure will absorb part of the vacuum ultraviolet light, which not only affects the analyte The high ionization efficiency will also shorten the service life of the UV lamp; thirdly, the atmospheric pressure photoionization source needs to apply high voltage during operation; finally, the collision frequency increases in the atmospheric pressure photoionization, and the reaction of molecular ions is violent. test object still not applicable

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