Quantifying the concentration of crude oil microdroplets in oil-water preparations

Environmental Toxicology and Chemistry
Aaron D RedmanDominic M Di Toro

Abstract

Dissolved constituents of crude oil, particularly polycyclic aromatic hydrocarbons (PAHs), can contribute substantially to the toxicity of aquatic organisms. Measured aqueous concentrations of high-molecular weight PAHs (e.g., chrysenes, benzo[a]pyrene) as well as long-chain aliphatic hydrocarbons can exceed the theoretical solubility of these sparingly soluble compounds. This is attributed to the presence of a "microdroplet" or colloidal oil phase. It is important to be able to quantify the dissolved fraction of these compounds in oil-in-water preparations that are commonly used in toxicity assays because the interpretation of test results often assumes that the compounds are dissolved. A method is presented to determine the microdroplet contribution in crude oil-in-water preparations using a comparison of predicted and measured aqueous concentrations. Measured concentrations are reproduced in the model by including both microdroplets and dissolved constituents of petroleum hydrocarbons. Microdroplets were found in all oil-water preparation data sets analyzed. Estimated microdroplet oil concentrations typically ranged from 10 to 700 µg oil/L water. The fraction of dissolved individual petroleum hydrocarbons ranges from 1.0 for...Continue Reading

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Citations

Dec 12, 2012·Integrated Environmental Assessment and Management·Peter F LandrumDavid S Page
Jun 10, 2014·Environmental Toxicology and Chemistry·Aaron D RedmanPeter V Hodson
Jul 15, 2015·Marine Pollution Bulletin·Aaron D Redman, Thomas F Parkerton
Sep 1, 2014·The Science of the Total Environment·Karel P J ViaeneFrederik De Laender
Aug 7, 2014·Marine Pollution Bulletin·Daniel LetinskiTim Nedwed
Feb 28, 2014·Human and Ecological Risk Assessment : HERA·David S PageRalph Elston
Sep 19, 2016·Ecotoxicology and Environmental Safety·Tara A DuffyEdward J Chesney
Oct 30, 2016·Environmental Toxicology and Chemistry·Aaron D RedmanThomas F Parkerton
Oct 5, 2016·Environmental Science & Technology·Roger C PrinceAaron D Redman
Jan 21, 2017·Environmental Toxicology and Chemistry·Aaron D RedmanKlass den Haan
Apr 19, 2017·Environmental Toxicology and Chemistry·Bryson E FinchWilliam A Stubblefield
Apr 5, 2016·Nature Communications·Corina P D BrussaardJan Roelof van der Meer
Dec 21, 2018·Environmental Toxicology and Chemistry·Kevin CailleaudMarkus Hjort
Dec 15, 2020·Environmental Pollution·Julie E AdamsPeter V Hodson
Aug 24, 2021·Environmental Toxicology and Chemistry·Katherina A Softcheck

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