Search

Your search keyword '"Snihur, Katherine N."' showing total 20 results
Start Over Author "Snihur, Katherine N." Publication Year Range Last 10 years
20 results on '"Snihur, Katherine N."'

5. Drivers of hydrologic budgets in small terminal lakes in the Alberta prairies.

Author

Snihur, Katherine N., Soares, Julia Valentina, Oiffer, Alex, Reyes, Alberto V., Flynn, Shannon L., Smerdon, Brian D., Konhauser, Kurt O., Froese, Duane, and Alessi, Daniel S.

Subjects
ENDORHEIC lakes, STABLE isotope analysis, PRAIRIES, CHEMICAL weathering, WATER table, GRASSLAND conservation
Abstract

Copyright of Canadian Water Resources Journal / Revue Canadienne des Ressources Hydriques is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024
Full Text
View/download PDF

8. Linking Topographical Ring Features to Geochemical and Geophysical Anomalies.

Author

von Gunten, Konstantin, Hamilton, Stewart M., DiLoreto, Zach A., Alam, Md Samrat, Snihur, Katherine N., Dittrich, Maria, Konhauser, Kurt O., and Alessi, Daniel S.

Abstract

Circular features in forests seen from air have been studied for several decades at different locations around the world. Forest rings, as they are called in Canada's boreal forests, express several geochemical (pH, carbonate content) and geophysical (surface potential) anomalies on their 20–30 m wide ring edges. Although it has been proposed that microbial processes may cause these anomalies, the exact mechanisms of ring formation are still unknown. We focused on the Thorn North forest ring in Ontario, Canada to correlate the surface potential anomaly to soil gas concentrations. Field measurements showed that the surface potential drop at the ring edge center is framed by peaks in CO2 production, which is linked to O2 depletion and methane generation. Carbon isotope signatures were found to drop to lighter values (down to −20‰), suggesting increased respiration. Higher concentrations of uronic acids bound to extracellular polymeric substances were found, indicating that the surface potential anomaly is linked to respiration. 16S rRNA gene sequencing of shallow soil did not indicate a dominant microbial group on the edges; instead, principal component analysis showed that the microbial composition was controlled by the substrate (clayey vs. sandy soil), therefore future studies should focus on deeper ground layers. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

9. Persisting Effects in Daphnia magna Following an Acute Exposure to Flowback and Produced Waters from the Montney Formation

Author

Boyd, Aaron, primary, Luu, Ivy, additional, Mehta, Devang, additional, Myers, Sunil P., additional, Stewart, Connor B., additional, Shivakumar, Karthik R., additional, Snihur, Katherine N., additional, Alessi, Daniel S., additional, Rodriguez Gallo, Maria Camila, additional, Veilleux, Heather, additional, Wiltse, Marin E., additional, Borch, Thomas, additional, Uhrig, R. Glen, additional, and Blewett, Tamzin A., additional

Published
2023
Full Text
View/download PDF

11. Accelerating mineral carbonation in hydraulic fracturing flowback and produced water using CO2-rich gas

Author

Zhu, Bizhou, primary, Wilson, Siobhan A., additional, Raudsepp, Maija J., additional, Vessey, Colton J., additional, Zeyen, Nina, additional, Safari, Salman, additional, Snihur, Katherine N., additional, Wang, Baolin, additional, Riechelmann, Sylvia, additional, Paulo, Carlos, additional, Power, Ian M., additional, Rostron, Ben J., additional, and Alessi, Daniel S., additional

Published
2022
Full Text
View/download PDF

12. Unlocking the potential of hydraulic fracturing flowback and produced water for CO2 removal via mineral carbonation

Author

Zhu, Bizhou, primary, Wilson, Siobhan A., additional, Zeyen, Nina, additional, Raudsepp, Maija J., additional, Zolfaghari, Ashkan, additional, Wang, Baolin, additional, Rostron, Ben J., additional, Snihur, Katherine N., additional, von Gunten, Konstantin, additional, Harrison, Anna L., additional, and Alessi, Daniel S., additional

Published
2022
Full Text
View/download PDF

13. Embryonic cardio-respiratory impairments in rainbow trout (Oncorhynchus mykiss) following exposure to hydraulic fracturing flowback and produced water

Author

Folkerts, Erik J., Snihur, Katherine N., Zhang, Yifeng, Martin, Jonathan W., Alessi, Daniel S., Goss, Greg G., Folkerts, Erik J., Snihur, Katherine N., Zhang, Yifeng, Martin, Jonathan W., Alessi, Daniel S., and Goss, Greg G.

Abstract

During hydraulic fracturing, wastewaters - termed flowback and produced water (FPW) - are created as a by-product during hydrocarbon extraction. Given the large volumes of FPW that a single well can produce, and the history of FPW release to surface water bodies, it is imperative to understand the hazards that hydraulic fracturing and FPW pose to aquatic biota. Using rainbow trout embryos as model organisms, we investigated impacts to cardio-respiratory system development and function following acute (48 h) and sub-chronic (28-day) FPW exposure by examining occurrences of developmental deformities, rates of embryonic respiration (MO2), and changes in expression of critical cardiac-specific genes. FPW-exposed embryos had significantly increased rates of pericardial edema, yolk-sac edema, and tail/trunk curvatures at hatch. Furthermore, when exposed at three days post-fertilization (dpf), acute 5% FPW exposures significantly increased embryonic MO2 through development until 15 dpf, where a switch to significantly reduced MO2 rates was subsequently recorded. A similar trend was observed during sub-chronic 1% FPW exposures. Interestingly, at certain specific developmental timepoints, previous salinity exposure seemed to affect embryonic MO2; a result not previously observed. Following acute FPW exposures, embryonic genes for cardiac development and function were significantly altered, although at termination of sub-chronic exposures, significant changes to these same genes were not found. Together, our evidence of induced developmental deformities, modified embryonic MO2, and altered cardiac transcript expression suggest that cardio-respiratory tissues are toxicologically targeted following FPW exposure in developing rainbow trout. These results may be helpful to regulatory bodies when developing hazard identification and risk management protocols concerning hydraulic fracturing activities.

Published
2022
Full Text
View/download PDF

19. Persisting Effects in Daphnia magnaFollowing an Acute Exposure to Flowback and Produced Waters from the Montney Formation

Author

Boyd, Aaron, Luu, Ivy, Mehta, Devang, Myers, Sunil P., Stewart, Connor B., Shivakumar, Karthik R., Snihur, Katherine N., Alessi, Daniel S., Rodriguez Gallo, Maria Camila, Veilleux, Heather, Wiltse, Marin E., Borch, Thomas, Uhrig, R. Glen, and Blewett, Tamzin A.

Abstract

Hydraulic fracturing extracts oil and gas through the injection of water and proppants into subterranean formations. These injected fluids mix with the host rock formation and return to the surface as a complex wastewater containing salts, metals, and organic compounds, termed flowback and produced water (FPW). Previous research indicates that FPW is toxic to Daphnia magna (D. magna), impairing reproduction, molting, and maturation time; however, recovery from FPW has not been extensively studied. Species unable to recover have drastic impacts on populations on the ecological scale; thus, this study sought to understand if recovery from an acute 48 h FPW exposure was possible in the freshwater invertebrate, D. magnaby using a combination of physiological and molecular analyses. FPW (0.75%) reduced reproduction by 30% and survivorship to 32% compared to controls. System-level quantitative proteomic analyses demonstrate extensive perturbation of metabolism and protein transport in both 0.25 and 0.75% FPW treatments after a 48 h FPW exposure. Collectively, our data indicate that D. magnaare unable to recover from acute 48 h exposures to ≥0.25% FPW, as evidence of toxicity persists for at least 19 days post-exposure. This study highlights the importance of considering persisting effects following FPW remediation when modeling potential spill scenarios.

Published
2023
Full Text
View/download PDF

20. Production of a carbonaceous sorbent from the CO2pyrolysis of hydraulic fracturing flowback and produced water solids

Author

von Gunten, Konstantin, Seip, Adam, Hubmann, Magdalena, Snihur, Katherine N., and Alessi, Daniel S.

Abstract

Hydraulic fracturing produces wastewater, referred to as flowback and produced water, which can be saline or brackish, and contain residual additives (e.g.: friction reducers, biocides) and chemicals from the formation water (brines) that may pose risks to the environment, if not properly managed and handled according to existing regulations. Here, we created a pyrolyzed product from flowback water and characterize the resulting material for the purpose of using it for contaminant sorption. The produced pyrolyzed flowback water solids were compositionally comparable to biochar and activated carbon samples, had a high pH value (9.6), surface area (92 m2/g), and sorption capacity (120 mg/g methylene blue), and showed relatively low concentrations of most metals and metalloids as compared to other charcoal materials. The new material was shown to perform better than activated carbon and biochar to remove metals from flowback water, demonstrating its potential use in flowback water treatment operations.

Published
2020
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results