Asphaltene content and composition as a measure of Deepwater Horizon oil spill losses within the first 80days

Lewan, Michael D.; Warden, Augusta; Dias, Robert F.; Lowry, Z.K.; Hannah, T.L.; Lillis, Paul G.; Kokaly, Raymond F.; Hoefen, Todd M.; Swayze, Gregg A.; Mills, Christopher T.; Harris, Steve H.; Plumlee, G. S.

doi:10.1016/j.orggeochem.2014.06.004

Cited by 33 publications

(25 citation statements)

References 15 publications

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“…comm. ), but less than 1.0 ± 0.1% in the Macondo oil (Lewan et al 2014). See Table 2 for some additional comparative analysis between the DwH crude and the crude oil harvested from 2 of the platforms that contributed to the Refugio incident oil mix.…”

Section: Cultures Waf and Bacterial Inoculummentioning

confidence: 99%

Incorporation of oil into diatom aggregates

Passow¹,

Sweet²,

Francis³

et al. 2019

Mar. Ecol. Prog. Ser.

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Rolling table experiments were conducted to investigate the incorporation of 2 types of dispersed oil into diatom aggregates. The goal was to provide specific input parameters for aggregation models that predict the transport of oil to depth via marine snow-sized aggregates (> 0.5 mm). The amount of oil incorporated into aggregates is a function of both aggregated biomass and dispersed oil concentration. The maximum carrying capacity of diatom aggregates for dispersed oil likely lies at ~40% of the aggregated organic carbon. These data allow estimates of the amount of oil routed via the aggregation pathway. Furthermore, the concentrations of transparent exopolymer particles (TEP) and the composition of EDTA-extracted extracellular polymeric substances (EPS) were tested as generally valid proxies for stickiness, which is a critical value in aggregation models. TEP and EDTA-extractable EPS were correlated with each other, but aggregation success was not readily predictable from these measurements. The large chemical heterogeneity of TEP and EPS likely obscures a generally valid relationship. Additionally, we found that, contrary to expectations, the sinking velocity of oil-containing aggregates was not decreased, but slightly increased compared to their non-oil-containing counterparts. Tighter packaging of cells due to the oil likely causes this effect. Sinking velocity is an important parameter in aggregation−sedimentation models, as it determines the time required for aggregates to reach the seafloor and thus the potential for flux attenuation. Transport of oil to the seafloor exposes benthic organisms, and those feeding on them, to substances that potentially have negative effects on organisms and ecosystems.

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Section: Cultures Waf and Bacterial Inoculummentioning

confidence: 99%

Incorporation of oil into diatom aggregates

Passow¹,

Sweet²,

Francis³

et al. 2019

Mar. Ecol. Prog. Ser.

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“…Chemical analyses of the oil residues indicate a decrease in the abundance of n-alkanes and polycyclic aromatic hydrocarbons (PAH), and an increase in oxygen content due to the formation of oxygenated hydrocarbons (OxHC; Aeppli et al, 2012), also supported by Lewan et al (2014). The OxHC formed are thought to be derived from both aromatic and saturated components of oil (Hall et al, 2013), and analysis via Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) has provided unambiguous support that the OxHC are indeed produced and not preferentially enriched (Ruddy et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Long-term weathering and continued oxidation of oil residues from the Deepwater Horizon spill

White

Wang

Williams

et al. 2016

Marine Pollution Bulletin

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To investigate the long-term weathering of oil from the Deepwater Horizon (DWH) incident, oil-soaked sand patties were collected from Gulf of Mexico beaches from Florida to Alabama over a three-year period from 2012 to 2014. Analysis of oil residues by gas chromatography with flame ionization detection (GC-FID), thin-layer chromatography with flame ionization detection (TLC-FID), and Fourier transform infrared spectroscopy (FT-IR) indicated uniformity in their chemical composition. Some variability within and between samples was observed, arising from differences in exposure to light and water, which increase the amount of weathering. Oxygenated hydrocarbons (OxHC) produced by weathering processes dominate the majority of oil residues. These OxHC have continued recalcitrance in the environment, and increase in relative abundance over time. Analyses of the bulk characteristics of oil residues via TLC-FID and FT-IR should be continued as these techniques provide important insight into the weathering state of oil residues.

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“…At sites where residual crude oil or petroleum hydrocarbon fuel contaminants are present in the environment, partial oxidation products form from biodegradation reactions (Cozzarelli et al ; Beller et al ; Thorn and Aiken ; Gieg et al ; Lundegard and Sweeney ) and from photo‐oxidation in the case of surface exposures (e.g. Lewan et al ). These transformation products are more soluble than the parent petroleum hydrocarbons due to their greater polarity and corresponding low volatility (Zemo and Foote ; Lang et al ; Melbye et al ; Zemo et al ).…”

Section: Introductionmentioning

confidence: 99%

Crude Oil Metabolites in Groundwater at Two Spill Sites

et al. 2016

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Two groundwater plumes in north central Minnesota with residual crude oil sources have 20 to 50 mg/L of nonvolatile dissolved organic carbon (NVDOC). These values are over 10 times higher than benzene and two to three times higher than Diesel Range Organics in the same wells. On the basis of previous work, most of the NVDOC consists of partial transformation products from the crude oil. Monitoring data from 1988 to 2015 at one of the sites located near Bemidji, MN show that the plume of metabolites is expanding toward a lakeshore located 335 m from the source zone. Other mass balance studies of the site have demonstrated that the plume expansion is driven by the combined effect of continued presence of the residual crude oil source and depletion of the electron accepting capacity of solid phase iron oxide and hydroxides on the aquifer sediments. These plumes of metabolites are not covered by regulatory monitoring and reporting requirements in Minnesota and other states. Yet, a review of toxicology studies indicates that polar metabolites of crude oil may pose a risk to aquatic and mammalian species. Together the results suggest that at sites where residual sources are present, monitoring of NVDOC may be warranted to evaluate the fates of plumes of hydrocarbon transformation products.

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Asphaltene content and composition as a measure of Deepwater Horizon oil spill losses within the first 80days

Cited by 33 publications

References 15 publications

Incorporation of oil into diatom aggregates

Incorporation of oil into diatom aggregates

Long-term weathering and continued oxidation of oil residues from the Deepwater Horizon spill

Crude Oil Metabolites in Groundwater at Two Spill Sites

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