On-line continuous detection sample injector for mass spectrometer and application thereof

Abstract

The invention belongs to the technical field of mass spectrometers, and relates to an on-line continuous detection sample injector for a mass spectrometer. The sample injector comprises a hollow shell, a metal sleeve, a tee joint, a capillary tube and a heating component, wherein the metal sleeve is arranged in the shell; the shell is provided with a sleeve inlet and a sleeve outlet of the metal sleeve; the tee joint is arranged on the metal sleeve close to the sleeve outlet in the shell; two joints of the tee joint are connected in series on the metal sleeve, and the other joint of the tee joint is connected with one end of the capillary tube through a graphite clamping sleeve; the capillary tube is convoluted and coiled in the shell; one end of the capillary tube passes through the shell and is connected with an injection port of the mass spectrometer; and the heating component is arranged in the shell. The sample injector has the advantages of high generality, simple structure, lowcost, small occupied space, accurate temperature control, high and uniform heating temperature and the like, and can directly detect fluid at normal temperature and normal pressure.

Description

technical field [0001] The invention belongs to the technical field of mass spectrometers, and in particular relates to a continuous sample injector for mass spectrometry on-line detection, which can realize direct on-line continuous detection of normal-pressure fluids. Background technique [0002] Mass spectrometer, also known as mass spectrometer (mass spectrometer). It is an instrument for separating and detecting different isotopes, that is, according to the principle that charged particles can be deflected in an electromagnetic field, it is a type of instrument that separates and detects material composition according to the mass difference of material atoms, molecules or molecular fragments. According to the different mass analyzers used in mass spectrometers, mass spectrometers can be divided into dual focus mass spectrometers, quadrupole mass spectrometers, time-of-flight mass spectrometers, Fourier transform mass spectrometers, etc. Among them, the quadrupole mass...

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Problems solved by technology

However, in terms of how to avoid the influence of more liquid content in the sample on the injector and even the mass spectrometer, a good solution has not yet been found.

At present, the commonly used method is to heat the capillary with a heating jacket, and the sample directly enters the capillary sampler. This method still has the following problems: 1) It occupies a large volume and is not easy to connect with the reaction system; 2) The heating jacket Using polymer materials, the heating temperature is low; 3) When there is a gas-liquid mixture in the product, the capillary is prone to blockage due to uneven heat distribution at the connection between the capillary and the sampling device and the connection between the capillary and the mass spectrometer cavity

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