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  • Title: Assessment of sediment toxicity during anaerobic biodegradation of vegetable oil using Microtox and Hyalella azteca bioassays.
    Author: Li Z, Lee K, Cobanli SE, King T, Wrenn BA, Doe KG, Jackman PM, Venosa AD.
    Journal: Environ Toxicol; 2007 Feb; 22(1):1-8. PubMed ID: 17295275.
    Abstract:
    The potential ecological impacts of anaerobic degradation of vegetable oil on freshwater sediments were investigated. Sediment toxicity was evaluated using two regulatory biotests: the Microtox Solid Phase Test and an amphipod (Hyalella azteca) bioassay. The results of the Microtox test showed that the toxicity of the vegetable-oil-contaminated sediments (about 17-33 g oil/kg dry sediments) increased after 2 weeks incubation and then decreased to near background levels after incubation for 8 weeks under anaerobic conditions. The amphipod toxicity bioassay showed that the toxicity of fresh contaminated sediments decreased over time and returned to background levels within 8 weeks. These results suggest that the impact of vegetable oils on organisms within sediments may be limited. To account for the significance of environmental conditions, additional studies over a wide range of incubation conditions (e.g., temperature, nutrient concentration) and other test organisms at various trophic levels are recommended for both acute and chronic toxicity assessment.
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