scholarly journals Floating Photocatalysts for Passive Solar Degradation of Naphthenic Acids in Oil Sands Process-Affected Water

Water ◽  
2018 ◽  
Vol 10 (2) ◽  
pp. 202 ◽  
Author(s):  
Tim Leshuk ◽  
Harish Krishnakumar ◽  
Diogo de Oliveira Livera ◽  
Frank Gu
Keyword(s):  
Oil Sands ◽  
Naphthenic Acids ◽  
Passive Solar

scholarly journals Adamantane Carboxylic Acids Demonstrate Mitochondrial Toxicity Consistent with Oil Sands-Derived Naphthenic Acids

2021 ◽  
pp. 100092
Author(s):  
Kate I. Rundle ◽  
Mahmoud S. Sharaf ◽  
Don Stevens ◽  
Collins Kamunde ◽  
Michael R. Heuvel
Keyword(s):  
Carboxylic Acids ◽  
Oil Sands ◽  
Naphthenic Acids ◽  
Mitochondrial Toxicity

Performance of ectomycorrhizal alders exposed to specific Canadian oil sands tailing stressors under in vivo bipartite symbiotic conditions

2016 ◽  
Vol 62 (7) ◽  
pp. 543-549 ◽  
Author(s):  
Martin Beaudoin-Nadeau ◽  
André Gagné ◽  
Cyntia Bissonnette ◽  
Pier-Anne Bélanger ◽  
J. André Fortin ◽  
...  
Keyword(s):  
Oil Sands ◽  
Seedling Survival ◽  
Naphthenic Acids ◽  
Paxillus Involutus ◽  
Alnus Incana ◽  
In Vivo Selection ◽  
Alnus Viridis ◽  
Leaf Necrosis ◽  
Different Strains

Canadian oil sands tailings are predominately sodic residues contaminated by hydrocarbons such as naphthenic acids. These conditions are harsh for plant development. In this study, we evaluated the effect of inoculating roots of Alnus viridis ssp. crispa and Alnus incana ssp. rugosa with ectomycorrhizal fungi in the presence of tailings compounds. Seedlings were inoculated with 7 different strains of Paxillus involutus and Alpova diplophloeus and were grown under different treatments of NaCl, Na2SO4, and naphthenic acids in a growth chamber. Afterwards, seedling survival, height, dry biomass, leaf necrosis, and root mycorrhization rate were measured. Paxillus involutus Mai was the most successful strain in enhancing alder survival, health, and growth. Seedlings inoculated with this strain displayed a 25% increase in survival rate, 2-fold greater biomass, and 2-fold less leaf necrosis compared with controls. Contrary to our expectations, A. diplophloeus was not as effective as P. involutus in improving seedling fitness, likely because it did not form ectomycorrhizae on roots of either alder species. High intraspecific variation characterized strains of P. involutus in their ability to stimulate alder height and growth and to minimize leaf necrosis. We conclude that in vivo selection under bipartite symbiotic conditions is essential to select effective strains that will be of use for the revegetation and reclamation of derelict lands.

Comparison of methods for determination of total oil sands-derived naphthenic acids in water samples

Chemosphere ◽  
2017 ◽  
Vol 187 ◽  
pp. 376-384 ◽  
Author(s):  
Sarah A. Hughes ◽  
Rongfu Huang ◽  
Ashley Mahaffey ◽  
Pamela Chelme-Ayala ◽  
Nikolaus Klamerth ◽  
...  
Keyword(s):  
Water Samples ◽  
Oil Sands ◽  
Naphthenic Acids ◽  
Comparison Of Methods ◽  
Total Oil

scholarly journals The Effects of Naphthenic Acids on Tryptophan Metabolism and Peripheral Serotonin Signalling

2021 ◽  
Vol 5 (Supplement_1) ◽  
pp. A493-A493
Author(s):  
Laiba Jamshed ◽  
Genevieve A Perono ◽  
Shanza Jamshed ◽  
Kim Ann Cheung ◽  
Philippe J Thomas ◽  
...  
Keyword(s):  
Oil Sands ◽  
Naphthenic Acid ◽  
Kynurenine Pathway ◽  
Naphthenic Acids ◽  
Tryptophan Metabolism ◽  
Lipid Homeostasis ◽  
Prostaglandin E ◽  
Serotonin Synthesis ◽  
Active Metabolites ◽  
Glucose And Lipid Homeostasis

Abstract Introduction: Serotonin produced in the periphery has been shown to affect glucose and lipid homeostasis. The availability of the amino acid tryptophan, the precursor of serotonin, affects serotonin availability. In addition, the metabolism of tryptophan via the kynurenine pathway produces physiologically active metabolites which have been shown to be altered under conditions of increased adiposity and dysglycemia. There is now evidence demonstrating some environmental xenobiotics, known to affect glucose and lipid homeostasis, can also alter serotonin production and key components of the kynurenine pathway. Recent evidence suggests that exposure to compounds present in petroleum and wastewaters from oil and gas extraction sites can impact endocrine signaling and result in aberrant lipid accumulation and altered glycemic control. However, whether any of these changes can be causally ascribed to altered serotonin synthesis/signaling or tryptophan metabolism remains unknown. The goal of this study was to determine the effects of exposure to naphthenic acid (NA), a key toxicant found in wastewater from bitumen (thick crude oil present in oil sands deposits) extraction on the enzymes involved in tryptophan metabolism and serotonin production. Methods: McA-RH7777 rat hepatoma cells, were exposed to a technical NA mixture for 48 hours at concentrations within the reported range of NA found in wastewaters from oil extraction. We assessed mRNA expression for key rate-limiting enzymes involved in tryptophan metabolism that lead to either serotonin [Tph1] and/or kynurenine [Ido2 and Tdo2] production, as well as downstream enzymes in the kynurenine pathway [Afmid, Kyat1, Aadat, Kyat3, Kmo, Haao, Acmsd, Qprt]. We also examined the effects of NA on prostaglandin synthesis [Ptgs1, Ptgs2, Ptges] and signalling [Ptger2, Ptger4] as prostaglandins have been shown to be induced by serotonin and are linked to hepatic fat accumulation. Results: NA treatment significantly increased Tph1 and Ido2 expression; this occurred in association with a significant increase in the expression of the inducible prostaglandin synthase Ptgs2 (COX-2), prostaglandin E synthase Ptges, and prostaglandin receptors Ptger2 and Ptger4. Acmsd was the only downstream enzyme in the kynurenine pathway that was significantly altered by NA treatment. Conclusion: These results provide proof-of-concept that compounds associated with oil sands extraction have the potential to perturb key components of serotonin synthesis (Tph1) and tryptophan metabolism (Ido2, Acmsd). Furthermore, we found that the increase in Tph1 expression paralleled expression of Ptgs2. As increased prostaglandin production has been reported in association with nonalcoholic steatohepatitis, these data provide a potential mechanism by which exposure to NA and other petroleum-based compounds may increase the risk of metabolic disease.

Naphthenic acids speciation and removal during petroleum-coke adsorption and ozonation of oil sands process-affected water

2011 ◽  
Vol 409 (23) ◽  
pp. 5119-5125 ◽  
Author(s):  
Mohamed Gamal El-Din ◽  
Hongjing Fu ◽  
Nan Wang ◽  
Pamela Chelme-Ayala ◽  
Leonidas Pérez-Estrada ◽  
...  
Keyword(s):  
Petroleum Coke ◽  
Oil Sands ◽  
Naphthenic Acids

Characterization and determination of naphthenic acids species in oil sands process-affected water and groundwater from oil sands development area of Alberta, Canada

2018 ◽  
Vol 128 ◽  
pp. 129-137 ◽  
Author(s):  
Rongfu Huang ◽  
Yuan Chen ◽  
Mohamed N.A. Meshref ◽  
Pamela Chelme-Ayala ◽  
Shimiao Dong ◽  
...  
Keyword(s):  
Oil Sands ◽  
Naphthenic Acids ◽  
Development Area

Advances in mass spectrometry for molecular characterization of oil sands naphthenic acids and process chemicals in wetlands

2021 ◽  
Author(s):  
John Headley ◽  
Kerry Peru ◽  
Ian Vander Meulen
Keyword(s):  
Mass Spectrometry ◽  
Water Quality ◽  
Molecular Characterization ◽  
Oil Sands ◽  
Industrial Process ◽  
Naphthenic Acids ◽  
Diverse Range ◽  
Water Quality Guidelines ◽  
Quality Guidelines ◽  
Resolution Mass

Advances in mass spectrometry in the authors’ and key collaborators’ research are reviewed for analysis of oil sands naphthenic acids fraction compounds (NAFCs) and industrial process chemicals, sulfolane and alkanolamines in wetlands. Focus is given to developments of analyses of NAFCs in constructed wetland treatment systems and natural wetlands in the Athabasca oil sands region, Alberta, Canada. The analytical developments are applied to show the utility of wetlands to sequester and oxidize oil sands naphthenic acids. The advancements in molecular characterization led to the first application of high-resolution mass spectrometry (Fourier transform ion-cyclotron resonance; and Orbitrap mass spectrometry) for elucidation of toxic mono-and dicarboxylic NAFCs in oil sands environmental samples. Key findings reveal that oil sands NAFCs are not limited to saturated structures, but contain a diverse range of components, many of which contain S, N, heteroatomic species and aromatic species. Other developments of mass spectrometry methods for industrial process chemicals show for the first time that the completely water-miscible chemical, sulfolane, translocate to upper portions of cattails at natural wetland sites in the Canadian environment. Likewise, wetland-plant mediated changes of complex mixtures of alkanolamines were revealed based on the coupling of ion chromatography mass spectrometry and ultrahigh resolution mass spectrometry. The advances in mass spectrometry are of particular benefit to Canada, for development of soil and water quality guidelines for oil sands NAFCs and process chemicals. In turn, the water quality guidelines serve to protect Canadian aquatic environments.

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