Toxicity of sediment oiled with diluted bitumens to freshwater and estuarine amphipods

MARINE POLLUTION BULLETIN

卷:163

Article

Barron, M. G.¹  Moso, E. M.¹  Conmy, R. N.²  Meyer, P.³  Sundaravadivelu, D.⁴ 

[1] US EPA, Off Res & Dev, Gulf Breeze, FL 32561 USA

[2] US EPA, Off Res & Dev, Cincinnati, OH 45268 USA

[3] Hydrosphere Res, Alachua, FL 32615 USA

[4] Pegasus Tech Serv, Cincinnati, OH 45268 USA

关键词: Diluted bitumen;    Dilbit;    Toxicity;    PAH;    Petroleum hydrocarbon;    Sediment;    Amphipod;   

DOI  :  10.1016/j.marpolbul.2020.111941

来源: Elsevier

【 摘 要 】

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 EC2Os 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.

【 授权许可】

Free