Evaluation of accelerated biodegradation of oil-SPM aggregates (OSAs)

Leoncio, Lua; Almeida, Marcos de; Silva, Márcio; Oliveira, Olívia Maria Cordeiro de; Moreira, Ícaro Thiago Andrade; Lima, Danusia Ferreira

doi:10.1016/j.marpolbul.2020.110893

Cited by 4 publications

(1 citation statement)

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“…Oil-SPM Aggregates (OSA) are effective measures to cleanse oil spills. The oil droplets are easily fragmented into smaller particles of few micrometers, increasing its surface contact and leading to a quick transfer from the water surface to the water column, (Le Floch et al 2002;Stoffyn-Egli & Lee 2002;Leoncio et al 2020). The formation of OSA in the environment by the oil-SPM interaction increases the oil dispersion rate, biodegradation and prevents that it continues to adhere to the sediment (Owens 1999;Lee & Stoffyn-Egli 2001).…”

Section: Introductionmentioning

confidence: 99%

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

2021

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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 LC 50 (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 (LC 50 7.91%), whereas the concentration with the least toxic potential was 300 mg/L (LC 50 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.

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