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 . doi:10.1016/j.chemosphere.2019.01.162 (In Press)

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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
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:	29 January 2019
Dates:	Date Event 29 January 2019 Available 28 January 2019 Accepted
Date of first compliant deposit:	7 February 2019
DOI:	10.1016/j.chemosphere.2019.01.162
Status:	Peer Reviewed
Publication Status:	In Press
Access rights to Published version:	Restricted or Subscription Access
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID EP/L015307/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 275910721 Newton Fund http://dx.doi.org/10.13039/100010897 FP44842-039-2015 Departamento Administrativo de Ciencia, Tecnología e Innovación http://dx.doi.org/10.13039/100007637

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