Toxicity of sediment oiled with diluted bitumens to freshwater and estuarine amphipods
| Autor: | Mace G. Barron, Devi Sundaravadivelu, Robyn N. Conmy, Peter Meyer, Elizabeth Moso |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Canada Geologic Sediments 010501 environmental sciences Aquatic Science Oceanography 01 natural sciences Article Animals Amphipoda 0105 earth and related environmental sciences Total organic carbon geography geography.geographical_feature_category biology 010604 marine biology & hydrobiology Aquatic ecosystem Dilbit Hyalella azteca Sediment Estuary biology.organism_classification Pollution Hydrocarbons Azteca Benthic zone Environmental chemistry Environmental science Water Pollutants Chemical |
| Zdroj: | Mar Pollut Bull |
| ISSN: | 0025-326X |
| Popis: | To address knowledge gaps and the lack of benchmarks on the toxicity of dilbit oiled sediments, weathered Cold Lake Blend (CLB) and Western Canadian Select (WCS) were assessed in 10-day sediment tests with the amphipods Hyalella azteca and Leptocheirus plumulosus. Lowest observed effect concentrations (LOECs) and 20% effect levels (EC20s) were determined for wet weight sediment concentrations of TPH and total PAHs normalized to 1% organic carbon. LOECs and EC20s for TPH ranged from 216 to 1165 mg/kg sediment in H. azteca, and from 64 to 75 mg/kg sediment in L. plumulosus. Dilbit LOECs and EC20s for total PAHs ranged from 2.9 to 11.8 mg/kg sediment in H. azteca, and from 0.75 to 0.87 mg/kg in L. plumulosus. Comparison of toxicity-based benchmarks derived from the current study to sediment concentrations from past spills indicate that dilbit spills in aquatic habitats may pose substantial risks to freshwater and estuarine benthic organisms. |
| Databáze: | OpenAIRE |
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