Mass spectrum rapid enrichment-thermal analysis membrane sample introduction apparatus and application

Abstract

The invention discloses a mass spectrum rapid enrichment-thermal analysis membrane sample introduction apparatus and an application. The apparatus comprises an enclosed cavity, and a heating wire whose outer surface is sleeved by a tubular enrichment membrane passes through the center of the cavity; a sample inlet and a sample outlet are arranged on the wall of the cavity, the sample inlet is connected with a sample pool through a sample induction pipe, the sample outlet is connected with a tail gas pipe or a waste liquid pool through a sample discharge pipe, and a sampling device is arranged on the sample introduction pipe or the sample discharge pipe; the wall of the cavity is provided with a sweeping gas inlet and a sweeping gas outlet, the sweeping gas inlet is designed in a tee structure, one end communicates with an external gas source, one end is empty, and the other end is directly connected with the wall of the cavity; the enclosed cavity is connected with a sample introduction capillary of a mass spectrometer through a valve; and the sweeping gas outlet is connected with the tail gas pipe or the waste liquid pool through the sample discharge pipe. The apparatus provided by the invention is combined with a mass spectrometer for application, sample preprocessing is unnecessary, and the apparatus is suitable for quasi online mass spectrometry of semi-volatile organic compounds (SVOCs) in an environment.

Description

technical field [0001] The invention belongs to a mass spectrometry sampling device, and provides a film sampling device for rapid enrichment-thermal analysis of semi-volatile organic compounds (SVOCs) in the analysis environment without any sample pretreatment. Background technique [0002] SVOCs are a class of organic compounds with boiling points in the range of 170-350 °C, which are ubiquitous in the atmosphere, water and soil environments. SVOCs in the environment are classified by chemical substances, mainly including polycyclic aromatic hydrocarbons, chlorobenzenes, nitrobenzenes, nitrotoluenes, phthalates, nitrosoamines, anilines, chloroanilines, Chlorinated hydrocarbons, chlorinated ethers, benzidines, chlorinated benzidines, chlorinated phenols and nitrophenols, etc. Most of SVOCs are biologically toxic, and some even have carcinogenic, teratogenic and mutagenic effects. They have large molecular weight, high boiling point, low saturated vapor pressure, and poor b...

AI Technical Summary

Problems solved by technology

In traditional membrane-injected mass spectrometry devices, in order to meet the requirements of vacuum in the ionization region of the mass spectrometer, it is necessary to use a membrane with a small area, which is not conducive to the improvement of analytical sensitivity

In addition, due to the physical and chemical properties of semi-volatile organic compounds (SVOCs): large molecular weight and high boiling point, sufficient energy needs to be supplied to resolve them from the enrichment membrane. Therefore, the traditional membrane sampling method is less sensitive to its determination. Low

[0005] In order to overcome the problem of low sensitivity of traditional membrane-injected mass spectrometry in the determination of semi-volatile organic compounds (SVOCs), this device combines the idea of ​​rapid enrichment-thermal analysis, and designs an enrichment-thermal analysis membrane sampling device

Images