Liquid chromatography-mass spectrometry detection method for migration quantity of photoinitiator in paper printing UV ink

A liquid chromatography-mass spectrometry detection method for the migration quantity of a photoinitiator in the paper printing UV ink comprises the following steps of (1) carrying out a food simulantmigration test on a paper sample according to standard requirements to obtain a water-based food simulant test solution and/or an oil-based food simulant test solution; (2) filtering the water-basedfood simulant test solution by using a microporous filter membrane, and directly determining the migration amount of the photoinitiator by using liquid chromatography-mass spectrometry; extracting theoil-based food simulant test solution by acetonitrile, taking an acetonitrile solution layer after centrifugal layering, and determining the migration amount of the photoinitiator by liquid chromatography-mass spectrometry after the filtration by a microporous filter membrane, wherein the liquid chromatography adopts a formic acid aqueous solution with the volume fraction of 0.05-0.15% as a mobile phase A, and adopts a for