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Ion–Molecule Reactions of Halocarbon Cations with Polycyclic Aromatic Hydrocarbons in a Quadrupole Ion Trap. Part II—applications to environmental analysis
Author(s) -
Mosi Andrew A.,
Cullen William R.,
Eigendorf Guenter K.
Publication year - 1998
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/(sici)1096-9888(199803)33:3<250::aid-jms628>3.0.co;2-i
Subject(s) - chemistry , ion , ion trap , adduct , mass spectrometry , electron ionization , quadrupole ion trap , molecule , halocarbon , chemical ionization , structural isomer , mass spectrum , ionization , analytical chemistry (journal) , chromatography , organic chemistry
Ion–molecule reactions between the cations CH 3 CHF + and CH 3 CF 2 + generated from 1,1‐difluoroethane and gas chromatographic eluents from a sediment extract containing polycyclic aromatic hydrocarbons (PAHs) were used to differentiate groups of PAH structural isomers. Formation of specific adducts led to characteristic mass spectra for the different isomers. Differences in the ion chromatograms for M + , MH + , [M+CH 3 CHF] + , [M+CH 3 CHF‐HF] + , [M+CH 3 CF 2 ] + , and [M+CH 3 CF 2 ‐HF] + (M=PAH molecule) allowed the resolution of co‐eluting isomers. As the ratio of yields of adducts was not changed by methyl substitution, it was possible to differentiate and quantitate alkylated PAHs for which standards were not available. By performing a series of transformations between the ion chromatograms of the most characteristic adducts, information on individual isomer groups could be deconvoluted from complex clusters of isomers. This ion trap/chemical ionization technique displayed calibration curve parameters similar to those for electron ionization analysis and limits of detection of 170 pg in the sediment extract. © 1998 John Wiley & Sons, Ltd.