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Salting-out effects on the characterization of naphthenic acids from Athabasca oil sands using electrospray ionization
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Headley, John V., Barrow, Mark P., Peru, Kerry M. and Derrick, Peter J. (2011) Salting-out effects on the characterization of naphthenic acids from Athabasca oil sands using electrospray ionization. Journal of Environmental Science and Health, Part A, Vol.46 (No.8). pp. 844-854. doi:10.1080/10934529.2011.579857 ISSN 1093-4529.
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Official URL: http://dx.doi.org/10.1080/10934529.2011.579857
Abstract
There is growing interest in the mass spectrometric characterization of oil sands acids present in natural waters and contaminated soils. This interest stems from efforts to isolate the principal toxic components of oil sands acid extractable organics in aquatic environment. Salting-out effects are demonstrated for nanospray ionization mass spectra of Athabasca oil sands acid extractable organics (naphthenic acids), using Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry. The differences in spectra obtained for the sodium naphthenates in dichloromethane/acetonitrile cosolvents compared to spectra obtained in the absence of saturated sodium chloride salts, are used here as a surrogate to indicate the more bioavailable or toxic components in natural waters. Whereas, monocarboxylic compounds (CnH2n+ZO2) were prevalent in the Z =-4, -6, and -12 (2, 3 and 6-ring naphthenic acids respectively) family in the carbon number range of 13 to 19 in the dichloromethane/acetonitrile cosolvent systems, salting-out effects resulted in a general enhancement of Z =-4 species, relative to others. Likewise, the shift in relative intensities of species containing O1, O3, O4, O2S and O3S was dramatic for systems with and without saturated salts present. The O4 and O3S species for example, were prevalent in the dichloromethane/acetonitrile cosolvent but were non-detected in the presence of saturated salts. Interactions of oil sands acids with salts are expected to occur in oil sands processed waters and natural saline waters. As evident by the distribution of species observed, salting-out effects will play a major role in limiting the bioavailability of oil sands acids in aquatic systems.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Library of Congress Subject Headings (LCSH): | Naphthenic acids, Athabasca Tar Sands (Alta.), Electrospray ionization mass spectrometry, Oil sands | ||||
Journal or Publication Title: | Journal of Environmental Science and Health, Part A | ||||
Publisher: | Taylor & Francis Inc. | ||||
ISSN: | 1093-4529 | ||||
Official Date: | 2011 | ||||
Dates: |
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Volume: | Vol.46 | ||||
Number: | No.8 | ||||
Page Range: | pp. 844-854 | ||||
DOI: | 10.1080/10934529.2011.579857 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Funder: | Program of Energy Research and Development (Canada) (PERD) |
Data sourced from Thomson Reuters' Web of Knowledge
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