Gas chromatography-mass spectrometerIt is an analytical technique that combines the efficient separation capability of gas chromatography with the high-sensitivity qualitative analysis capability of mass spectrometry.

　　Gas chromatography-mass spectrometerThe workflow is roughly as follows: the sample to be tested is first vaporized, and then separated using a capillary column. The separated sample is converted into positive ions in the ion source, which are generated by electron bombardment of the ionization source (EI) and enter the quadrupole system through repulsion, focusing, and extraction of electrodes. The quadrupole forms a high-frequency electric field under the combined action of high-frequency voltage and positive and negative voltage. Only ions that satisfy specific motion equations can reach the ion detector through the center of symmetry of the quadrupole. After being amplified by an amplifier, the ion flow generates a mass spectrometry signal. Qualitative analysis of unknown samples can be performed by analyzing mass spectra or conducting spectral library searches.

This device can analyze and identify the content and molecular structure of various substances in complex mixtures; Separation and qualitative testing of trace compounds in materials, environmental samples, and biological samples; Separation and qualitative testing of components such as drugs, volatile organic compounds, and organic residue. It plays an important role in many fields such as chemistry, environmental protection, electronics, textiles, petrochemical industry, essence and spices, medicine and agriculture.