Apparatus for and method of determining purity of a peak of a pe

Details Apparatus for and method of determining purity of a peak of a pe Apparatus for and method of determining purity of a peak of a pe

1995-01-13

1997-01-21

Williams, Hezron E.

Measuring and testing

Gas analysis

Gas chromatography

364498, G01N 3002

Patent

active

055961355

ABSTRACT:
It is judged whether a part of a peak section of a chromatogram corresponding to a component of a sample is pure by comparing a similarity value of the absorbance spectrum of the part to a threshold value. The similarity value r and the threshold value t are calculated as follows. a) A series of absorbance spectra of a sample effluent from a column of the chromatograph are obtained repeatedly at a plurality of time points of short intervals. An absorbance spectrum is composed of a set of absorbance data with respect to wavelengths of light passing through the sample. b) A chromatogram of the sample is constructed using the series of absorbance spectra. c) A peak section including an object component of the sample is detected in the chromatogram. d) A similarity value is then calculated as a cosine of the angle between an absorbance spectrum vector and a standard spectrum vector. e) The threshold value is calculated by a cosine of the angle between two outermost tangential lines of an n-dimensional sphere centering an end of the absorbance spectrum vector and another n-dimensional sphere centering an end of the standard spectrum vector.

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