Determination of the Toxic Potential of the Formation of Oil-Suspended Particulate Matter Aggregates (OSA) in a Simulated Microscale Experiment

Ana Carina Matos Silva, Isabel Honorata Azevedo, Alexandre Dacorso Daltro Milazzo

Abstract


The aggregation of suspended particulate matter (SPM) and oil droplets in environments with specific hydrodynamic energy can lead to the formation of Oil-SPM Aggregates (OSA). A laboratory simulation was conducted in order to examine the possible toxic potential of OSA formation using three different concentrations of particulate material (50, 200, 300 mg/L) in a microscale experiment. The procedure was performed through toxicological testing of acute exposure to determine the LC50 (lethal concentration 50%) using the microcrustacean Artemia salina as a test organism. Serial dilutions were made from surface and bottom samples in order to characterize different toxicity. The concentration that showed the highest potential toxicity was 200 mg/L, having the same values for surface and bottom (LC50 7.91%), whereas the concentration with the least toxic potential was 300 mg/L (LC50 31.5%) for surface samples. Negative correlation was found between redox potential and the hydrogenionic potential (only for samples with 200 mg/L of sediment), and positive correlation was found between toxicity factors (percent dilution and mortality) and the other monitored parameters.


Keywords


Oil-SPM Aggregates; Artemia salina; Geochemistry

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DOI: https://doi.org/10.11137/1982-3908_2021_44_35441

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