In a detecting device based on mass spectrometry, fast screening is conducted
by using a step (201) of acquiring a mass spectrum and a step (202)
of deciding if ions of an intrinsic m/z are present. In accordance with the decision
results from the decision step (202), a step (203) of conducting
tandem mass spectrometry is switched to so as to make detailed checking. A step
(204) of deciding if ions of peculiar m/z are present is executed on the
basis of the results obtained by the tandem mass spectrometry. An alarm is issued
according to the decision result step (205). Thus, fast and less-misreporting
detecting can be performed.
