Hydrocarbon analysis using desorption atmospheric pressure chemical ionization

Handle URI:
http://hdl.handle.net/10754/562856
Title:
Hydrocarbon analysis using desorption atmospheric pressure chemical ionization
Authors:
Jjunju, Fred Paul Mark; Badu-Tawiah, Abraham K.; Li, Anyin; Soparawalla, Santosh; Roqan, Iman S. ( 0000-0001-7442-4330 ) ; Cooks, Robert Graham
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.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program; Semiconductor and Material Spectroscopy (SMS) Laboratory
Publisher:
Elsevier BV
Journal:
International Journal of Mass Spectrometry
Issue Date:
Jul-2013
DOI:
10.1016/j.ijms.2012.08.030
Type:
Article
ISSN:
13873806
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.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorJjunju, Fred Paul Marken
dc.contributor.authorBadu-Tawiah, Abraham K.en
dc.contributor.authorLi, Anyinen
dc.contributor.authorSoparawalla, Santoshen
dc.contributor.authorRoqan, Iman S.en
dc.contributor.authorCooks, Robert Grahamen
dc.date.accessioned2015-08-03T11:12:57Zen
dc.date.available2015-08-03T11:12:57Zen
dc.date.issued2013-07en
dc.identifier.issn13873806en
dc.identifier.doi10.1016/j.ijms.2012.08.030en
dc.identifier.urihttp://hdl.handle.net/10754/562856en
dc.description.abstractCharacterization 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.en
dc.description.sponsorshipThe 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.en
dc.publisherElsevier BVen
dc.subjectAmbient ionization mass spectrometryen
dc.subjectCharge exchangeen
dc.subjectFuelsen
dc.subjectIon-molecule reactionsen
dc.subjectPetroleum constituentsen
dc.subjectPolynuclear aromaticsen
dc.titleHydrocarbon analysis using desorption atmospheric pressure chemical ionizationen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentSemiconductor and Material Spectroscopy (SMS) Laboratoryen
dc.identifier.journalInternational Journal of Mass Spectrometryen
dc.contributor.institutionDepartment of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47906, United Statesen
kaust.authorRoqan, Iman S.en
kaust.authorJjunju, Fred Paul Marken
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.