By Wilfried M.A. Niessen
A suite of information at the primary rules, instrumentation of fuel chromatography and mass spectrometry, and business, scientific, toxicological, environmental, forensic, pharmaceutical, and food-related purposes, from forty scientists from around the globe utilizing GC-MS in perform.
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Extra info for Current Practice of Gas Chromatography-Mass Spectrometry (Chromatographic Science Series)
Example text
Examples of three applications are then presented to provide a broader understanding of the potential of SI in GC–MS. 1. 1. Nitrogen-Containing Compounds SIOMS is (particularly) well suited to the analysis of alkylamine, aminoalcohols, quaternary ammonium salts, and hydrazines, which exhibit an intense molecular ion, together with several diagnostic ions for structural determination. In particular, alkylamine and hydrazines show sensitivities in SI that are significantly higher than for EI. The appearance of the ion in the spectrum of tetramethylammonium chloride provides evidence for the evaporation of intact salt molecules.
Only removing the carbon from the surface and reoxidizing the emitter, which can be established by oxygen injections, can restore the ionizing ability. Thus, in order to avoid poisoning the emitter, continuous oxygen introduction should be employed to sustain the constant ionization efficiency. 4. RESPONSE AND PERFORMANCE CHARACTERISTICS Response and performance characteristics were assessed using (1) calibration curve and linear dynamic range, (2) sensitivity, (3) selectivity, and (4) noise and minimum detectable amount.
A bimolecular surface reac- 36 Fujii tion of proton transfer complex is the most probable mechanism of formation. The process is shown in Eq. 4. Reactive Surface Ionization (RSI) Diphenylamine (DPA) proved to be an interesting compound for SIOMS [18]. The SI mass spectrum of DPA shows that, in addition to DSI and MSI ions, there are ions formulated as [(C 6 H 5 ) 2 NCCH 2 ]ϩ. These ions are apparently different from those of ASI, in which an association process takes place. We speculate that DPA may act as a nucleophile in the reaction with the CH 3 radicals on the emitter surface.