Identification of chemical substances by testing and screening of hypotheses. II. Determination of impurities in n-hexane and naphthalene.
The impurities in n-hexane and naphthalene are identified by gas chromatography and mass spectrometry when applying the multiple criteria of identification. The identification uncertainty is expressed by the significance level, the difference in retention indexes and the mass spectra fit value. Identified impurities are substances which are rather abundant in nature/practice/research and rather frequently co-cited with matrix substance in chemical literature. This regularity is discussed with reference to statistical treatment of chemical database as a means to screen identification hypotheses.