Standardization of Mass Spectra by Means of Total Ion Intensity

Abstract

The analytical method described has the advantages of rapidity, sensitivity, and giving clean-cut separations, but the nitrogen peak height (or area) is affected by the presence of nitric oxide and carbon monoxide. Because the important variable is composition and not sample size, more extensive calibration is needed than normal. The enhancement of the nitrogen peak height is linear with respect to per cent nitric oxide, but because nitric oxide is not directly determined, its peak height cannot be used to evaluate a suitable

Correlation of mass spectra with structure in aromatic oxygenated compounds.Aromatic alcohols and phenols

“…Peak heights are expressed as per cent of the total ionization (4,11), obtained by the summation of the intensities of every peak of the spectra from m/e 73 to m/e parent + 2. Partial total ionization summation is used because some spectra xvere originally obtained only above m/e 73.…”

Compound type analysis applied to GC-MS studies of saturated hydrocarbon fractions from geologic samples

“…Sensitivity coefficients for a given compound type determined by the GC-MS method are derived by summing the individual ion intensities representing that compound type and then expressing this sum as a percentage of the total ion current. This is done for known compounds and assumes, on the basis of evidence presented by Hood (1958), that the ion current is proportional to the amount of sample entering the source. Therefore, the sensitivity coefficients for any given series should theoretically be constant throughout the elution of the GC peak.…”