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    Hydrocarbon analysis using desorption atmospheric pressure chemical ionization

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    Type
    Article
    Authors
    Jjunju, Fred Paul Mark
    Badu-Tawiah, Abraham K.
    Li, Anyin
    Soparawalla, Santosh
    Roqan, Iman S. cc
    Cooks, Robert Graham
    KAUST Department
    Electrical Engineering Program
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Semiconductor and Material Spectroscopy (SMS) Laboratory
    Date
    2013-07
    Permanent link to this record
    http://hdl.handle.net/10754/562856
    
    Metadata
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    Abstract
    Characterization of the various petroleum constituents (hydronaphthalenes, thiophenes, alkyl substituted benzenes, pyridines, fluorenes, and polycyclic aromatic hydrocarbons) was achieved under ambient conditions without sample preparation by desorption atmospheric pressure chemical ionization (DAPCI). Conditions were chosen for the DAPCI experiments to control whether ionization was by proton or electron transfer. The protonated molecule [M+H]+ and the hydride abstracted [MH]+ form were observed when using an inert gas, typically nitrogen, to direct a lightly ionized plasma generated by corona discharge onto the sample surface in air. The abundant water cluster ions generated in this experiment react with condensed-phase functionalized hydrocarbon model compounds and their mixtures at or near the sample surface. On the other hand, when naphthalene was doped into the DAPCI gas stream, its radical cation served as a charge exchange reagent, yielding molecular radical cations (M+) of the hydrocarbons. This mode of sample ionization provided mass spectra with better signal/noise ratios and without unwanted side-products. It also extended the applicability of DAPCI to petroleum constituents which could not be analyzed through proton transfer (e.g., higher molecular PAHs such as chrysene). The thermochemistry governing the individual ionization processes is discussed and a desorption/ionization mechanism is inferred. © 2012 Elsevier B.V.
    Citation
    Jjunju, F. P. M., Badu-Tawiah, A. K., Li, A., Soparawalla, S., Roqan, I. S., & Cooks, R. G. (2013). Hydrocarbon analysis using desorption atmospheric pressure chemical ionization. International Journal of Mass Spectrometry, 345-347, 80–88. doi:10.1016/j.ijms.2012.08.030
    Sponsors
    The authors acknowledge funding for this work by the National Science Foundation (CHE NSF 0848650) and the Fellowship from King Abdullah University Of Science and Technology (KAUST) Thuwal Saudi Arabia.
    Publisher
    Elsevier BV
    Journal
    International Journal of Mass Spectrometry
    DOI
    10.1016/j.ijms.2012.08.030
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ijms.2012.08.030
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Electrical and Computer Engineering Program; Material Science and Engineering Program

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