Mass spectrometry

Details Mass spectrometry Mass spectrometry

2007-12-11

2007-12-11

Larkin, Daniel S. (Department: 2856)

Measuring and testing

Gas analysis

Gas chromatography

C073S023410, C095S082000, C422S089000, C436S161000

Reexamination Certificate

active

11391432

ABSTRACT:
A method of gas chromatograph mass spectrometry with a negative chemical ionization (NCI) process includes analyzing a standard substance for the NCI by deriving with a derivatization reagent a fatty acid with a multiple number of carbon atoms, measuring the standard substance for the NCI by negative chemical ionization, and obtaining a retention time for each of the number of carbon atoms. The method includes measuring, under a same condition, a standard sample of each of from one to a plurality of measurement object components by negative chemical ionization, and obtaining a respective retention time for each of the measurement object components, and obtaining a retention index for the NCI of each measurement object component using the respective retention time of the measurement object component, and the retention time of the standard substance. The index facilitates both correcting the retention time of each measurement object component, and identifying substances.

REFERENCES:
patent: 3898837 (1975-08-01), Boege
patent: 4835708 (1989-05-01), Frans
patent: 5436166 (1995-07-01), Ito et al.
patent: 5939612 (1999-08-01), Wylie et al.

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