Method for simultaneous multicomponent analysis using mass spectrometry and mass spectrometer

A method for a simultaneous multicomponent analysis in which an SIM (selected ion monitoring) measurement or MRM (multiple reaction monitoring) measurement is performed for each of a plurality of known target compounds in a sample using a mass spectrometer, and a quantity of each of the compounds is determined based on a result of the measurement, wherein:

• a mass-to-charge ratio to be monitored in the SIM measurement or an MRM transition to be monitored in the MRM measurement, which is one of measurement conditions, is determined as follows:
• for a target compound having a comparatively high measurement target concentration or comparatively high measurement sensitivity, a mass-to-charge ratio or MRM transition which yields a comparatively low signal intensity is selected from a plurality of mass-to-charge ratios or MRM transitions related to the target compound concerned, and for a target compound having a comparatively low measurement target concentration or comparatively low measurement sensitivity, a mass-to-charge ratio or MRM transition which yields a comparatively high signal intensity is selected from a plurality of mass-to-charge ratios or MRM transitions related to the target compound concerned.