Ap. Snyder et al., MULTIVARIATE STATISTICAL-ANALYSIS CHARACTERIZATION OF APPLICATION-BASED ION MOBILITY SPECTRA, Analytica chimica acta, 316(1), 1995, pp. 1-14
Ion mobility spectral datasets were investigated for the potential to
discriminate between classes of compounds using multivariate statistic
al analysis techniques. Entire ion mobility spectra, including the rea
ctant ion peak (RIP), were obtained using a hand-held gas chromatograp
hy-ion mobility spectrometer (GC-IMS) to ensure vapor quality through
chromatographic prefractionation. The chosen datasets were application
-based and consisted of (1) 15 compounds representative of illegal dru
g synthesis precursors/purification solvents, (2) 18 compounds that ar
e airborne contaminants in the NASA space shuttle, (3) benzene, toluen
e, xylenes and six polyaromatic hydrocarbons among 41 alkane, alkene a
nd alkylaromatic compounds typical of petroleum-based environmental co
ntaminants. Principal component and discriminant rotation analyses of
these datasets satisfactorily separated the various classes of compoun
ds from each other. AU spectra displayed an RIP that was between 20-75
% of its maximum, and either the monomer or monomer and dimer peaks we
re present for every compound in the datasets. Despite these relativel
y wide ranges in the ion mobility response characteristics, it appears
that there is potential for multivariate statistical analysis techniq
ues to discriminate between the ion mobility spectra of a diverse set
of compounds.