Method for generating parameterized ecotoxicity data of dispersed oil for use in environmental modelling

Nordtug, Trond; Olsen, Anders J.; Altin, Dag; Meier, Sonnich; Overrein, Ingrid; Hansen, Bjørn Henrik; Johansen, Øistein

doi:10.1016/j.marpolbul.2011.07.015

Cited by 76 publications

(80 citation statements)

References 12 publications

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“…The DSDs of the dilution series obtained from the Coulter Counter analysis (Fig.8, top) show consistent size distributions following a uniform distribution centered at a diameter size of 11.98 µm. These results were consistent with previous experiments which generated droplets of similar sizes using the droplet generator system (Nordtug et al, 2011a;Nordtug et al, 2011b). Unlike the high energy preparations, the nominal concentrations of the dilution series and the actual concentrations measured by both the Coulter Counter and the fluorescence method were consistent (Fig.8, bottom).…”

Section: Dilution Series Of Oil Water Dispersions (Owds) Prepared Witsupporting

confidence: 91%

“…Some of these parameters consist of the following: (1 (Nordtug et al, 2011a) to high-energy water accommodated fractions (HEWAFs) created by manual or mechanical mixing (Carls et al, 2008;Echols et al, 2015).…”

Section: Exposure Media Used For Toxicity Testmentioning

confidence: 99%

“…Very few studies have shown a comprehensive physical characterization of the particulate oil in the test media and the methods used for this purpose often lack of standardization (microscopy) , do not have enough selectivity towards oil droplets (Coulter Counter particle analyzer) (Hansen et al, 2009;Nordtug et al, 2011a), are limited by the technology used (Laser In-Situ Scattering and Transmissometry, LISST) (Conmy et al, 2014;Li et al, 2011;Li et al, 2009;Trudel et al, 2010) or conducted after the fact by complex solubility calculations once the full chemical characterization is completed (Redman et al, 2012a). All these limitations prevent timely feedback on the evolution of the mixtures before, during and after the test which could be used to manage the longer periods of time required for chronic toxicity testing (> 7 days).…”

Section: Characterization Of Oil Water Mixturesmentioning

confidence: 99%

“…Mechanically created OWDs followed the pressurized fluid injection method described by Nordtug et al (2011a). The generator consisted of a series of chambers with connecting nozzles which is capable of producing dispersions of consistent DSDs using turbulent flow mixing.…”

Section: Preparation Of Oil Water Dispersions (Owds)mentioning

confidence: 99%

“…The effect of dilution on droplet sizes and droplet concentrations were further explored for OWDs prepared with MASS oil using the droplet generator method described by Nordtug et al (2011a) which allows the preparation of exposure media with consistent droplet sizes and reproducible concentrations. The DSDs of the dilution series obtained from the Coulter Counter analysis (Fig.8, top) show consistent size distributions following a uniform distribution centered at a diameter size of 11.98 µm.…”

Section: Dilution Series Of Oil Water Dispersions (Owds) Prepared Witmentioning

confidence: 99%

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Physical and Chemical Characterization of Crude Oil-Water Mixtures: Understanding the Effects of Interfacial Process to Chemical Bioavailability

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Section: Dilution Series Of Oil Water Dispersions (Owds) Prepared Witsupporting

confidence: 91%

Section: Exposure Media Used For Toxicity Testmentioning

confidence: 99%

Section: Characterization Of Oil Water Mixturesmentioning

confidence: 99%

Section: Preparation Of Oil Water Dispersions (Owds)mentioning

confidence: 99%

Section: Dilution Series Of Oil Water Dispersions (Owds) Prepared Witmentioning

confidence: 99%

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Physical and Chemical Characterization of Crude Oil-Water Mixtures: Understanding the Effects of Interfacial Process to Chemical Bioavailability

Sandoval¹

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Effects of dispersed oil on reproduction in the cold water copepod Calanus finmarchicus (Gunnerus)

Olsen

Nordtug

Altin

et al. 2013

Enviro Toxic and Chemistry

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Following a 120-h exposure period to 3 concentrations of oil dispersions (0.022 mg L−1, 1.8 mg L−1, and 16.5 mg L−1, plus controls) generated from a North Sea crude oil and a subsequent 21-d recovery, mortality, and several reproduction endpoints (egg production rates, egg hatching success, and fraction of females participating in reproduction) in Calanus finmarchicus were studied. Concentration-dependent mortality was found during exposure, averaging to 6%, 3%, 15%, and 42% for the controls and 3 exposure levels, respectively. At the start of the recovery period, mean egg production rates of surviving females from the highest concentrations were very low, but reproduction subsequently improved. In a 4-d single female reproduction test starting 13 d postexposure, no significant differences in egg production rates or hatching success were found between reproducing control and exposed copepods. However, a significantly lower portion of the surviving females from the highest exposure participated in egg production. The results indicate that although short-term exposure to oil-polluted water after an oil spill can induce severe mortality and temporarily suspend reproduction, copepods may recover and produce viable offspring soon after exposure. The results might imply that for C. finmarchicus populations, the impact from short-term exposure to an oil spill might be predicted from acute mortality and that delayed effects make only a limited contribution to population decrease.

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Oil droplet ingestion and oil fouling in the copepod Calanus finmarchicus exposed to mechanically and chemically dispersed crude oil

Nordtug

Olsen

Salaberria

et al. 2015

Enviro Toxic and Chemistry

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The rates of ingestion of oil microdroplets and oil fouling were investigated in the zooplankton filter-feeder Calanus finmarchicus (Gunnerus, 1770) at 3 concentrations of oil dispersions ranging from 0.25 mg/L to 5.6 mg/L. To compare responses to mechanically and chemically dispersed oil, the copepods were exposed to comparable dispersions of micron-sized oil droplets made with and without the use of a chemical dispersant (similar oil droplet size range and oil concentrations) together with a constant supply of microalgae for a period of 4 d. The filtration rates as well as accumulation of oil droplets decreased with increasing exposure concentration. Thus the estimated total amount of oil associated with the copepod biomass for the 2 lowest exposures in the range 11 mL/kg to 17 mL/kg was significantly higher than the approximately 6 mL/kg found in the highest exposure. For the 2 lowest concentrations the filtration rates were significantly higher in the presence of chemical dispersant. Furthermore, a significant increase in the amount of accumulated oil in the presence of dispersant was observed in the low exposure group.

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Method for generating parameterized ecotoxicity data of dispersed oil for use in environmental modelling

Cited by 76 publications

References 12 publications

Physical and Chemical Characterization of Crude Oil-Water Mixtures: Understanding the Effects of Interfacial Process to Chemical Bioavailability

Physical and Chemical Characterization of Crude Oil-Water Mixtures: Understanding the Effects of Interfacial Process to Chemical Bioavailability

Effects of dispersed oil on reproduction in the cold water copepod Calanus finmarchicus (Gunnerus)

Oil droplet ingestion and oil fouling in the copepod Calanus finmarchicus exposed to mechanically and chemically dispersed crude oil

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