Tandem Mass Spectrometric Analysis (MS/MS) of Jet Fuels. Part 1. Experimental Procedures and Qualitative Data Analysis.
Final rept. 1 Jun-31 Jul 84,
GEO-CENTERS INC NEWTON UPPER FALLS MA
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A fast, direct mass spectrometry MS determination of hydrocarbon classes in jet fuels is presented. A novel inlet technique using 0.1 mm i.d. micropipet glass capillaries for sampling the liquid fuels and reproducibly placing the 10 to 20 microgram samples in the MS vacuum for analysis is demonstrated. Low voltage electron ionization is shown to produce molecular ion series characteristic of alkyl substituted naphthalenes, tetralins, and decalins. Structurally specific fragment ions for several hydrocarbons, as determined by gas chromatography - mass spectrometry, are used to help identify compound classes by tandem mass spectrometry MSMS. As discussed, MSMS can add a dimension of separation to overlapping molecular ion series while maintaining the greater speed of direct MS over GCMS. In addition, multivariate statistical analysis is demonstrated to be powerful method for comparison of MS spectra from complex jet fuels to chemical class standards.
- Industrial Chemistry and Chemical Processing
- Atomic and Molecular Physics and Spectroscopy