Low-temperature pressurization head space sample injection device for measuring volatile substances in atmosphere through GC-MS (gas chromatography-mass spectrometer) technology

Abstract

The invention relates to a low-temperature pressurization head space sample injection device for measuring volatile substances in the atmosphere through a GC-MS (gas chromatography-mass spectrometer) technology. The low-temperature pressurization head space sample injection device comprises a reciprocating full-glass piston pump which consists of a glass piston cylinder barrel (1), a unidirectional valve a (2), a unidirectional valve b (3), a clamp (4), a crank-link mechanism (5), a micro motor (6) and a worm speed reducer (7), a sampling head space bottle which comprises a head space bottle body (10) and cooling equipment, wherein a seal is arranged at the head space bottle; two injection needle heads with different lengths are inserted into the seal; the long needle head is in contact with the bottom to serve as a gas inlet needle (8); the short needle head is positioned at a bottleneck to serve as a gas exhaust needle (9); the gas inlet needle (8) is connected with the unidirectional valve b (3); the gas exhaust needle (9) is connected to a GC-MS; the head space bottle body (10) is arranged in the cooling equipment (12). Compared with the prior art, the low-temperature pressurization head space sample injection device has the advantages that the efficiency of collecting the volatile components in the atmosphere can be improved, so that the volatile components in the atmosphere can be fully collected and can be subjected to quantitative and qualitative compound analysis in the GC-MS.

Description

technical field [0001] The invention relates to a sampling device, in particular to a low-temperature pressurized headspace sampling device for GC-MS determination of volatile substances in the atmosphere. Background technique [0002] Gas chromatography-mass spectrometry (GC-MS) is the abbreviation of gas chromatography-mass spectrometry (GC-MS), which is a technology that combines gas chromatography (GC) and mass spectrometer (MS) through an appropriate interface, and uses computer technology to perform joint analysis. GC-MS is the most mature two-spectrum coupling technique. GC-MS is widely used in the separation and identification of complex components. It has the high resolution of GC and the high sensitivity of MS. It is suitable for the analysis of low molecular weight compounds (molecular weight <1000), especially for the analysis of volatile components. Volatile organic compounds (VOCs) are an important class of air pollutants, usually referring to organic compo...

AI Technical Summary

Problems solved by technology

The problem in the collection of volatile substances in the atmosphere is that the temperature difference and pressure difference between the inside and outside of the sampling tube can cause the volatilization and loss of the sample, and the compound cannot be analyzed correctly, which brings great errors and poor reproducibility to the analysis results.

In order to solve the above-mentioned problems of large sampling errors and poor reproducibility, this patent invents a low-temperature pressurized headspace sampling device

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