Toxicity Evaluation of Water and Pore Water from a Pilot-Scale Pit Lake in the Alberta Oil Sands Region to Daphnia Species.

Autor: Davila-Arenas CE; Toxicology Centre, University of Saskatchewan, Saskatoon, Canada., Doig L; Toxicology Centre, University of Saskatchewan, Saskatoon, Canada.; School of Environment and Sustainability, University of Saskatchewan, Saskatoon, Canada., Ji X; School of Environment and Sustainability, University of Saskatchewan, Saskatoon, Canada.; Global Institute for Water Security, University of Saskatchewan, Saskatoon, Canada.; Division of Environmental Pediatrics, Department of Pediatrics, Grossman School of Medicine, New York University, New York, NY, USA., Panigrahi B; Toxicology Centre, University of Saskatchewan, Saskatoon, Canada., Ezugba I; Toxicology Centre, University of Saskatchewan, Saskatoon, Canada., Liber K; Toxicology Centre, University of Saskatchewan, Saskatoon, Canada. karsten.liber@usask.ca.; School of Environment and Sustainability, University of Saskatchewan, Saskatoon, Canada. karsten.liber@usask.ca.
Jazyk: angličtina
Zdroj: Archives of environmental contamination and toxicology [Arch Environ Contam Toxicol] 2024 Jul; Vol. 87 (1), pp. 1-15. Date of Electronic Publication: 2024 Jun 02.
DOI: 10.1007/s00244-024-01071-z
Abstrakt: Significant amounts of tailings and oil sands process-affected water (OSPW) are generated by bitumen extraction in the Alberta Oil Sands region. These by-products are potentially toxic to aquatic organisms and require remediation. The study site was Lake Miwasin, a pilot-scale pit lake integrated into broader reclamation efforts. It consists of treated tailings overlaid with blended OSPW and freshwater, exhibiting meromictic conditions and harboring aquatic communities. This study assessed the potential toxicity of Lake Miwasin surface water (LMW) and pore water (LMP) using saline-acclimated Cladocera, including lab strains of Daphnia magna and Daphnia pulex and native Daphnia species collected in brackish Humboldt Lake (HL) and Lake Miwasin (LM). The pore water evaluation was used to represent a worst-case water quality scenario during pond stratification. Additionally, the inclusion of native organisms incorporated site-specific adaptations and regional sensitivity into the toxicity evaluation. Our results showed that LMW did not display acute or chronic toxicity to lab species and native Daphnia sp. (HL). Conversely, LMP was acutely toxic to both lab species and native D. pulex (LM). In chronic tests (12 days exposure), LMP negatively affected reproduction in D. pulex (lab), with reductions in the number of offspring. Limited ability to acclimated organisms to the high salinity levels of LMP resulted in a shortened exposure duration for the chronic toxicity test. In addition to salinity being identified as a stressor in LMP, toxicity identification evaluation (TIE) phase I findings demonstrated that the observed toxicity for D. magna (lab) and D. pulex (LM, native) might be attributed to ammonia and metals in LMP. Further investigations are required to confirm the contributions of these stressors to LMP toxicity.
(© 2024. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
Databáze: MEDLINE
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