To provide a method for discriminating foreign matter constituted so as to rapidly specify whether a foreign matter originates from a human being in the quality control of various products by solving a problem wherein, since impurities in a raw material, the skin of a worker or the like becomes the foreign matter in work environment for manufacturing electronic parts or the like, it becomes necessary for considering a counterplan with respect to the mixing with the foreign matter by analyzing the foreign matter to specify the generation source thereof.
Alkylammonium hydroxide having a methyl group is added to foreign matter and a hydroxybenzoic acid and a derivative thereof is methyl-esterified while the produced gas is analyzed by a gas chromatograph mass analyzing method. In a case that methyl ester methoxybenzoate is detected in gas chromatographmass analysis, it is discriminated that the foreign matter originates from the human being.
Seiji Iga
Toshiya Fujii
Nobuhiro Noguchi
Yusei Atsuya
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