Patent ID: 7820965

Claim:
A method for detecting a chemical substance, comprising steps of: ionizing a sample, obtaining a mass spectrum of an ion of said sample, determining detection or non-detection of a mass spectrum of specific m/z of an ion of said target chemical substance, outputting an alarm when said mass spectrum of specific m/z of an ion of said target chemical substance is detected, determining detection or non-detection of a mss spectrum of specific m/z of an adduct ion of a molecule of said target chemical substance with a molecule of an organic acid or an organic acid salt having a mass number of 40 to 400 when non-detection of a mass spectrum of specific m/z of said target chemical substance is determined, and outputting an alarm when said mass spectrum of specific m/z of said adduct ion of a molecule of said target chemical substance with a molecule of an organic acid or an organic acid salt having a mass number of 40 to 400 is detected.