Effects of oil dispersant on solubilization, sorption and desorption of polycyclic aromatic hydrocarbons in sediment–seawater systems

Zhao, Xiao; Gong, Yanyan; O’Reilly, Susan E.; Zhao, Dongye

doi:10.1016/j.marpolbul.2014.12.042

Cited by 41 publications

(18 citation statements)

References 40 publications

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“…Seabed-bound hydrocarbons are subjected to physical and biological processes which can translocate them (Konovalov et al, 2010;Zuijdgeest and Huettel, 2012). Solutes can be transported into sediments by diffusive and advective pore water fluxes (Huettel et al, 2014) and hydrocarbons may desorb from sediment, dissolve in the water column and be transported to remote locations (Zhao et al, 2015) where they may be degraded within the water column. The environmental conditions in the deep sea vary with location and a greater understanding of how hydrocarbons entrain and are removed from deep sea sediments is required to assess environmental risks in the event of an oil spill similar to DwH in a different location such as the FSC.…”

Section: Introductionmentioning

confidence: 99%

Bacterial Community Response in Deep Faroe-Shetland Channel Sediments Following Hydrocarbon Entrainment With and Without Dispersant Addition

et al. 2018

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Section: Introductionmentioning

confidence: 99%

Bacterial Community Response in Deep Faroe-Shetland Channel Sediments Following Hydrocarbon Entrainment With and Without Dispersant Addition

et al. 2018

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“…In contrast, in sandy sediments with a lower proportion of fines such as SB and YE sediments, 346 uptake increased with QSD25 suggesting that surfactant sorption may create new adsorption sites 347 in coarser sediments as previously reported for PHE in sandy loam and loamy sand using 348 Corexit 9500A (Gong et al 2014b). Corexit 9500A in solution (18 mg l -1 ) has been shown to 349 have limited effects on NAP sorption to sandy loam and loamy sand, increasing in NAP uptake 350 by sediment of 2.9% and 3.3%, respectively (Zhao et al 2015). Here, the highest uptake of 351 NAP was measured in YE sediments at ~0.8 mg SD25 g -1 (Fig.…”

Section: Effect Of Dispersant On Pah Uptake By Sediments 342mentioning

confidence: 63%

“…Consequently, the need arises to characterise the effects 98 of other ready-to-use and commercially available dispersants on oil-sediment interactions. 99 Zhao et al (2015) reported that Corexit 9500A has contrasting effects on the extent to which 100 hydrocarbons adsorb onto sediments; (1) Corexit 9500A increased the solubility of 101 hydrocarbons in seawater and (2) surfactants in Corexit 9500A adsorb to sediment particles 102 and create additional adsorption sites for hydrocarbons. 103…”

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confidence: 99%

Effects of Superdispersant-25 on the sorption dynamics of naphthalene and phenanthrene in marine sediments

et al. 2018

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Purpose: The present study evaluated the effects of Superdispersant-25 (SD25), a commercial dispersant stockpiled in the United Kingdom for oil spill response, on the sorption dynamics of two polyaromatic hydrocarbons, naphthalene (NAP) and phenanthrene (PHE), in sediment-seawater systems using three sediments near hydrocarbon exploration areas in the Faroe-Shetland Channel and North Sea. Materials and methods: Batch experiments were conducted to evaluate the effects of SD25 on the solubility (analysed by gas chromatography), distribution coefficients and desorption hysteresis of NAP and PHE separately as well as SD25 in the three sediments (analysed by UV-vis spectroscopy and surface tension measurements, respectively). Results and discussion: The results revealed that SD25 readily adsorbed to all sediment types but did not desorb from silty loam. SD25 application increased the solubility in seawater of PHE but not of NAP. Adsorbed SD25 increased the distribution coefficients of both polyaromatic hydrocarbons in sand but not silty loam and the solubilising effect of SD25 appeared to drive increased adsorption of PHE rather than sediment-adsorbed SD25 concentration. Conclusions: The findings highlight the influence of SD25 application on the sorption dynamics of NAP and PHE in marine sediments from areas near hydrocarbon exploration and production regions. An understanding of these interactions may aid responders in the decision-making process of dispersant application in the event of a spill as seabed characteristics affect oil-dispersant-sediment interactions. Response to Reviewers: Thank you for the comments on the latest version of the manuscript. As in the first revision, I've enclosed replies in a separate file for ease of visualisation. Powered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporation Ref.: Ms. No. JSSS-D-18-00190R1 Replies to reviewers' and editors' comments Comments by reviewers and editors are shown in italics and responses in bold.

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“…A mineral salts medium (MSM) containing NaCl 17.0 g L −1 , MgCl 2 ·6H 2 O 5.8 g L −1 , Na 2 HPO 4 3.0 g L −1 , NaHCO 3 2.5 g L −1 , KH 2 PO 4 2.0 g L −1 , NH 4 Cl 0.7 g L −1 , KCl 0.7 g L −1 , cycloheximide 0.1 g L −1 , resazurin 1.0 mg L −1 , FeCl 3 ·6H 2 O 0.5 mg L −1 , ZnCl 2 5.0 × 10 −2 mg L −1 , CaCl 2 2.0 × 10 −2 mg L −1 , CuSO 4 5.0 × 10 −3 mg L −1 and MnCl 2 ·4H 2 O 5.0 × 10 −3 mg L −1 was prepared, and the pH was adjusted to 7.2 ± 0.2 [38]. To select metabolically diverse hydrocarbonoclastic anaerobic bacteria, different terminal electron acceptors and chemical reducing agents (Table 2) [42,43] were used in the selective cultures with different sediment types (Table 3).…”

Section: Selective Cultures Of Estuarine Sedimentsmentioning

confidence: 99%

“…BSFs can be produced by several microorganisms, including bacteria, and can be used for different purposes [2]. These include the increase of bioavailability of surface-bound and hydrophobic substrates, such as petroleum hydrocarbons (PHs), via direct interfacial contact and pseudo-solubilization [3,4]. BSF production is often associated with the capacity to use hydrocarbons as carbon sources [5] and this combination of traits is particularly advantageous for PHs bioremediation strategies or microbial enhanced oil recovery (MEOR) [3,6].…”

Section: Introductionmentioning

confidence: 99%

Biosurfactant Production in Sub-Oxic Conditions Detected in Hydrocarbon-Degrading Isolates from Marine and Estuarine Sediments

Domingues

Oliveira

Serafim

et al. 2020

IJERPH

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Hydrocarbon bioremediation in anoxic sediment layers is still challenging not only because it involves metabolic pathways with lower energy yields but also because the production of biosurfactants that contribute to the dispersion of the pollutant is limited by oxygen availability. This work aims at screening populations of culturable hydrocarbonoclastic and biosurfactant (BSF) producing bacteria from deep sub-seafloor sediments (mud volcanos from Gulf of Cadiz) and estuarine sub-surface sediments (Ria de Aveiro) for strains with potential to operate in sub-oxic conditions. Isolates were retrieved from anaerobic selective cultures in which crude oil was provided as sole carbon source and different supplements were provided as electron acceptors. Twelve representative isolates were obtained from selective cultures with deep-sea and estuary sediments, six from each. These were identified by sequencing of 16S rRNA gene fragments belonging to Pseudomonas, Bacillus, Ochrobactrum, Brevundimonas, Psychrobacter, Staphylococcus, Marinobacter and Curtobacterium genera. BSF production by the isolates was tested by atomized oil assay, surface tension measurement and determination of the emulsification index. All isolates were able to produce BSFs under aerobic and anaerobic conditions, except for isolate DS27 which only produced BSF under aerobic conditions. These isolates presented potential to be applied in bioremediation or microbial enhanced oil recovery strategies under conditions of oxygen limitation. For the first time, members of Ochrobactrum, Brevundimonas, Psychrobacter, Staphylococcus, Marinobacter and Curtobacterium genera are described as anaerobic producers of BSFs. microorganisms have been identified as capable of producing BSF in anaerobiosis, with most of these belonging to the Bacillus and Pseudomonas genera [8].Hydrocarbonoclastic bacteria are characterized as being able to metabolize one or more PHs by using them as carbon and energy sources, usually preferring these substrates over others [9][10][11]. These bacteria are ubiquitous and can be found both in aerobic and anaerobic environments [12][13][14]. Natural anaerobic biodegradation of PHs occurs primarily in deep subsurface oil reservoirs [15], in the deep ocean near natural seeps [16,17] and in most microaerobic or anaerobic environments contaminated with PHs [18][19][20].While most of the deep-sea is characterized by low energy, productivity and biological activity rates [21], metabolic activity and biomass is higher in locations where seepage of PHs and other compounds occurs from within deep sediment layers to the seabed, such as hydrothermal vents and cold seeps [22,23]. Cold seeps, including mud volcanoes (MVs), are geologically diverse ecosystems associated with emissions of methane, other PHs and, often, reduced sulfate from the subsurface [24]. Deep-sea sediments, which are often anoxic below a thin upper layer [25], are known sinks for aliphatic and aromatic hydrocarbons [26,27]. Furthermore, bacterial communities from deep-sea surface sedi...

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Effects of oil dispersant on solubilization, sorption and desorption of polycyclic aromatic hydrocarbons in sediment–seawater systems

Cited by 41 publications

References 40 publications

Bacterial Community Response in Deep Faroe-Shetland Channel Sediments Following Hydrocarbon Entrainment With and Without Dispersant Addition

Bacterial Community Response in Deep Faroe-Shetland Channel Sediments Following Hydrocarbon Entrainment With and Without Dispersant Addition

Effects of Superdispersant-25 on the sorption dynamics of naphthalene and phenanthrene in marine sediments

Biosurfactant Production in Sub-Oxic Conditions Detected in Hydrocarbon-Degrading Isolates from Marine and Estuarine Sediments

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