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Title

Environmental Effects-Based Concentrations for Weathered Diesel-Range Organics: Toxicity in Marine Water and Freshwater

 
Publication number Date Published
20-03-008May 2020
VIEW NOW Environmental Effects-Based Concentrations for Weathered Diesel-Range Organics: Toxicity in Marine Water and Freshwater (Number of pages: 70) (Publication Size: 1762KB)




Appendix A. Screening Toxicity Tests (Nautilus)
(14 pages) (2MB)

Appendix B. Final Report for Toxicity Tests (Nautilus)
(241 pages) (30MB)

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Author(s) Hobbs W.O., C.V. Eickhoff, and K. Lee
Description In 2018 the Department of Ecology (Ecology) Toxics Cleanup Program (TCP) commissioned a study to establish concentration-response relationships for fresh petroleum contaminants that are protective of aquatic life in both marine water and freshwater environments. The current follow-up study (2019), establishes protective concentrations for aquatic life in both marine water and freshwater using weathered diesel-range organics (DRO), as defined by the Northwest TPH or NWTPH lab method.

The tests included the marine-water organisms: topsmelt (Atherinops affinis) and purple sea urchin (Strongylocentrotus purpuratus), and the freshwater organisms: fathead minnow (Pimephales promelas) and cladoceran (Ceriodaphnia dubia). Contaminated groundwater, impacted almost exclusively by DRO, was used in all toxicity tests. Silica gel cleanup on select samples suggested that DRO were composed largely of petroleum metabolites or polar compounds.

No measurable response was observed for either the marine or freshwater invertebrate species exposed to weathered DRO at the concentrations tested. The final estimate of the no-observable effects concentration (NOEC) threshold in marine waters, based on growth endpoints in topsmelt, was established at a concentration of 2.12 mg/L DRO. A NOEC was established for freshwater, based on the growth endpoint of fathead minnows, at a concentration of 3.04 mg/L DRO.
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Contact Will Hobbs at 360-407-7512 or whob461@ecy.wa.gov
Keywords polar metabolite, weathered diesel, hydrocarbons, toxicity, NWTPH
DATA Environmental Information Management (EIM) #WHOB005

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