1. Tandem mass spectrometry refers to twice mass spectrometry analysis in the mass spectrometer to selectively dissociate the parent ion of the target compound, while parallel mass spectrometry refers to simultaneous multiple mass spectrometry analysis in the mass spectrometer to speed up the analysis speed and improve the sample flux.

2. Tandem mass spectrometry produces a series of fragment ions, and one fragment ion is selected for re-analysis to obtain more detailed structural and chemical information. Parallel mass spectrometry uses multiple mass spectrometers and sector mass spectrometers to measure different mass spectrometry signals at the same time to meet the analysis requirements of Qualcomm quantity.