Abstract
The authors have determined elemental compositions for hundreds of components of diesel fuel, jet fuel (JP-8), and gasoline and characterized each of their chemical compositions before and after artificial weathering (ie evaporation to a specified fraction of the original weight). An all-glass heated inlet system (AGHIS) coupled to a home-built 6.0 T Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer provides ultrahigh mass resolving power and sufficiently high mass accuracy (less than or equal 0.8 ppm) for unique identification of all chemical components. A 1 micronL septum injection of each weathered/unweathered transportation fuel into the AGHIS yields a mass spectrum containing 100-500 peaks, 50 less than or equal to m/z less than or equal to 300, with as many as five peaks (of different elemental composition) at a given nominal mass. Elemental composition assignment of every peak in the mass spectrum of each fuel and its weathered analogues provides a unique chemical fingerprint that serves to identify positively the contaminant and quantitate the extent of weathering. Weathered jet and diesel fuels (and gasoline to a lesser extent) exhibit a significant shift in the relative abundance to higher-mass (m/z greater than or equal to 200) species, in accord with prior gas chromatographic (GC) evidence for a shift toward increased retention time with increased degree of weathering. (A)
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