GC-O/MS test system for bag type method direct sampling and test method thereof

Abstract

The invention relates to a GC-O / MS test system for bag type method direct sampling and a test method thereof. The test system comprises a drying oven, a PVF sampling bag, a bag type method direct sampling device, a gas chromatograph, a mass spectrometer and a sniffer. The PVF sampling bag is arranged in the drying oven and is connected with one end of an input pipe of the bag type method direct sampling device through a connector, another end of the input pipe of the bag type method direct sampling device is connected with a gas inlet of the bag type method direct sampling device, an air outlet of the bag type method direct sampling device is connected with an inlet of the gas chromatograph through a gas chromatograph input pipe, an outlet of the gas chromatograph is connected to the massspectrometer and a sniffer input pipe, another end of the sniffer input pipe is connected to the sniffer, and the sniffer is connected to an odor recording device through a line. According to the system and the test method, the bag type method direct sampling can be achieved, the loss of volatile substances can be reduced, the invention is suitable for the analysis of complex components, and the capture and identification of odorous substances at an olfactory discrimination port are facilitated.

Description

[technical field] [0001] The invention relates to the technical field of gas chromatography-mass spectrometry, in particular to a GC-O / MS test system and a test method for direct sample injection by bag method. [Background technique] [0002] The GC-O / MS technology formed by gas chromatography-mass spectrometry (GC-MS) combined with gas chromatography olfactory measurement (GC-O) can not only identify and quantify trace volatile organic compounds (VOC), but also sense The combination of analysis has high sensitivity and high selectivity, and combined with the analysis of odor caused by volatile substances, it is often used to analyze flavor substances in food and aroma substances in tobacco leaves. Among them, the front sampling method of gas chromatography analysis is the most widely used thermal desorption (TDS) sampling method. The volatile substances emitted by the sample are captured by adsorption tubes such as TENAX or activated carbon, and the substances in the sampli...

AI Technical Summary

Problems solved by technology

The application of TDS sampling is relatively mature at present. However, due to the limitation of the adsorption packing of the adsorption tube, some substances will be lost in the process of adsorption and desorption; when the humidity of the objective environment is high, the excessive water content of the sample will also cause damage to the column. , resulting in objective problems such as data distortion

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