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Characterization of oil sands naphthenic acids by negative-ion electrospray ionization mass spectrometry : influence of acidic versus basic transfer solvent
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Peru, Kerry M., Thomas, Mary J., Palacio Lozano, Diana Catalina, McMartin, Dena W., Headley, John V. and Barrow, Mark P. (2019) Characterization of oil sands naphthenic acids by negative-ion electrospray ionization mass spectrometry : influence of acidic versus basic transfer solvent. Chemosphere, 222 . pp. 1017-1024. doi:10.1016/j.chemosphere.2019.01.162
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Official URL: http://dx.doi.org/10.1016/j.chemosphere.2019.01.16...
Abstract
Considerable effort and progress has been made over the past decade with respect to development of analytical tools for the determination of naphthenic acids and related components in environmental samples. However, experimental variables that influence the analytical results have not been fully explored. The relative contributions of Ox classes are of particular interest in data obtained using negative-ion electrospray ionization mass spectrometry. Using two types of ultrahigh resolution mass spectrometers (Orbitrap and FT-ICR), the apparent pH of the transfer solvent was observed to have a significant impact upon compound class distributions. A basic transfer solvent favored the detection of Ox species of lower oxygen content, while acidic pH favored the preferential observation of organic compounds with higher oxygen contents. These observed trends were independent of the instrument type. In addition, when using an acidic transfer solvent, the overall observed response was reduced by a factor of ∼20. Thus, the apparent pH of the transfer solvent has critical influence upon detection and upon the profile of different components observed within a complex mixture. In turn, this significantly impacts oil sands environmental monitoring for toxicity, forensic interpretation, and quantitation; when comparing data sets from different laboratories, these findings should therefore be taken into account.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | T Technology > TN Mining engineering. Metallurgy | ||||||||||||
| Divisions: | Faculty of Science > Chemistry | ||||||||||||
| Library of Congress Subject Headings (LCSH): | Oil sands, Naphthenic acids, Electrospray ionization mass spectrometry | ||||||||||||
| Journal or Publication Title: | Chemosphere | ||||||||||||
| Publisher: | Pergamon | ||||||||||||
| ISSN: | 0045-6535 | ||||||||||||
| Official Date: | May 2019 | ||||||||||||
| Dates: |
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| Volume: | 222 | ||||||||||||
| Page Range: | pp. 1017-1024 | ||||||||||||
| DOI: | 10.1016/j.chemosphere.2019.01.162 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
| RIOXX Funder/Project Grant: |
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