Abstract
Purpose
Risks to native soil-dwelling organisms in terrestrial ecosystems contaminated by petroleum hydrocarbons (PHCs) are difficult to assess due to the range of compounds and their varying toxicity. Weathering of PHCs in soil has been shown to alter their chemical composition and decrease their associated toxicity. Hence, generic regulatory guidelines may inadequately predict risks and exposure scenarios at some sites.
Methods
In this study, the toxicity of both coarse- and fine-grained subarctic soils contaminated with weathered PHCs was assessed using two soil invertebrates, Folsomia candida and Proisotoma minuta. In addition to survival and reproduction tests, avoidance behavior was investigated using F. candida, P. minuta, Oppia nitens, and Folsomia bisetosa. Reference toxicant tests using boric acid were conducted to provide confidence in the interpretation of the results and verified the sensitivity of F. candida and P. minuta to contaminants.
Results
Despite exceeding the Canada-wide generic guidelines for PHC fraction 3 (F3), weathered contaminated soils at concentrations between 1140 and 5880 mg/kg had no significant negative impacts on the reproduction or mortality rates of F. candida or P. minuta. Furthermore, all four soil invertebrates preferred to inhabit the contaminated soils during the 48 h avoidances tests.
Conclusion
Natural weathering processes to PHC-impacted soils at a Canadian Subarctic site have led to a decrease in toxicity on four native soil invertebrates.
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Data availability
Data recorded during this study are available from the corresponding author upon reasonable request.
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Acknowledgements
This work was funded by the Natural Sciences and Engineering Research Council of Canada Collaborative Research and Development Grant (grant # 514935-17) and Imperial Oil Limited. We thank Rick Scroggins, Juliska Princz and their teams at the Biological Assessment and Standardization Section of Environment and Climate Change Canada for the careful culturing of invertebrates from the study site soils which led to the development of the original culture of Folsomia bisetosa. We thank Jeff Battigelli (then, Stantec Consulting Ltd.,) for invertebrate enumeration in the study site soils early in the project. We thank the Advisian staff that supported this project over the years, specifically Ann Glatiotis who initiated the original program.
Funding
This study was funded by Imperial Oil Limited and the Natural Sciences and Engineering Research Council of Canada Collaborative Research and Development Grant (grant # 514935–17).
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Conceptualization: Adrian Pang, Amy Gainer, Elizabeth Haack, Allison Rutter and Barbara Zeeb; Methodology: Adrian Pang; Data curation: Adrian Pang; Formal analysis: Adrian Pang; Investigation: Adrian Pang; Validation; Adrian Pang; Visualization: Adrian Pang; Writing-original draft: Adrian Pang; Writing- review and editing; Amy Gainer, Elizabeth Haack, Allison Rutter and Barbara Zeeb; Funding acquisition: Allison Rutter and Barbara Zeeb; Project administration: Allison Rutter and Barbara Zeeb; Supervision: Allison Rutter and Barbara Zeeb.
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Pang, A., Rutter, A., Gainer, A. et al. Assessment of heavily weathered petroleum hydrocarbon-impacted soils to native soil invertebrates from a Canadian subarctic site. J Soils Sediments 23, 2096–2105 (2023). https://doi.org/10.1007/s11368-023-03466-2
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DOI: https://doi.org/10.1007/s11368-023-03466-2