Effects of oil dispersant and oil on sorption and desorption of phenanthrene with Gulf Coast marine sediments

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

doi:10.1016/j.envpol.2013.10.031

Cited by 44 publications

(37 citation statements)

References 39 publications

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“…The equilibrium uptakes of naphthalene, 1-methylnaphthalene and pyrene were enhanced by 3.2%, 5.5% and 8.6%, respectively in the presence of WAO, and 14.1%, 19.2% and 15.3% by DWAO. Gong et al (2014b) reported that the Corexit EC9500A greatly enhanced the solubility of various petroleum hydrocarbons. As a result, the sediment will take up more of these dispersed hydrocarbons when exposed to DWAO than WAO, resulting in more hydrophobic sorption sites for PAHs.…”

Section: Effects Of Wao and Dwao On Sorption Of Pahsmentioning

confidence: 99%

“…The apparent solubility for each PAH nearly linearly increased with increasing dispersant concentration from 0 to 200 mg/L. The apparent critical micelle concentration (CMC) of Corexit EC9500A was determined to be 22.5 mg/L in seawater (Gong et al, 2014b). It is noteworthy that the dispersant enhanced the PAH solubility even at submicelle (<CMC) concentrations.…”

Section: Effects Of Wao and Dwao On Sorption Of Pahsmentioning

confidence: 99%

“…S1 in Supplementary Materials, SM) (Ko et al, 1998). Gong et al (2014b) reported that Corexit 9500A enhanced uptake of phenanthrene onto a sandy loam sediment.…”

Section: Introductionmentioning

confidence: 97%

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

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Section: Effects Of Wao and Dwao On Sorption Of Pahsmentioning

confidence: 99%

Section: Effects Of Wao and Dwao On Sorption Of Pahsmentioning

confidence: 99%

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

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et al. 2015

Marine Pollution Bulletin

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“…1 In addition, based on our recent work, 5,6 oil dispersants can significantly facilitate uptake of oil components on sediment particles, and dispersed oil is likely more adsorbable to SPM. However, detailed information remains lacking on how oil and dispersants impact the formation rate and characteristics of MOS.…”

Section: ■ Introductionmentioning

confidence: 97%

Effects of Oil and Dispersant on Formation of Marine Oil Snow and Transport of Oil Hydrocarbons

Gong

Zhao

et al. 2014

Environ. Sci. Technol.

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This work explored the formation mechanism of marine oil snow (MOS) and the associated transport of oil hydrocarbons in the presence of a stereotype oil dispersant, Corexit EC9500A. Roller table experiments were carried out to simulate natural marine processes that lead to formation of marine snow. We found that both oil and the dispersant greatly promoted the formation of MOS, and MOS flocs as large as 1.6-2.1 mm (mean diameter) were developed within 3-6 days. Natural suspended solids and indigenous microorganisms play critical roles in the MOS formation. The addition of oil and the dispersant greatly enhanced the bacterial growth and extracellular polymeric substance (EPS) content, resulting in increased flocculation and formation of MOS. The dispersant not only enhanced dissolution of n-alkanes (C9-C40) from oil slicks into the aqueous phase, but facilitated sorption of more oil components onto MOS. The incorporation of oil droplets in MOS resulted in a two-way (rising and sinking) transport of the MOS particles. More lower-molecular-weight (LMW) n-alkanes (C9-C18) were partitioned in MOS than in the aqueous phase in the presence of the dispersant. The information can aid in our understanding of dispersant effects on MOS formation and oil transport following an oil spill event.

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“…For example, the desorption percent was 33-40 % in the gastric fluid (pH=2.0), 18-24 % in the intestinal fluid (fasted, pH=7.5), and 20-26 % in the intestinal fluid (fed, pH=7.5); meanwhile, the desorption capacity in gastrointestinal fluids was much greater than that in natural water, which meant that some biomolecules (pepsin and bile salts) could enhance the desorption of the chemicals and promoted their bioavailability to the aquatic organisms. Many researches showed that there are often hysteresis phenomenon in the adsorption/desorption process of chemicals on nanoparticles in aqueous medium (Chi et al 2013;Gong et al 2014), which indicated that the adsorption behaviors of CNTs in water was not completely reversible. For three kinds of initial q e values, the adsorption/desorption isotherms of MMA in deionized water were plotted in Fig.…”

Section: Desorption Of Mma From Cnts In Gastrointestinal Fluidsmentioning

confidence: 99%

Adsorption/desorption and bioavailability of methamphetamine in simulated gastrointestinal fluids under the presence of multiwalled carbon nanotubes

Zhang

Xiong

Wang

et al. 2015

Environ Sci Pollut Res

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Adsorption/desorption and desorption hysteresis of methamphetamine (MMA) on carbon nanotubes (CNTs) as well as bioavailability of MMA were studied in simulated gastrointestinal fluids and background fluids. Adsorption of MMA in near-neutral (weak alkaline) intestinal fluid was enhanced, while adsorption of MMA on CNTs in acid gastric fluid was suppressed. Desorption of MMA is divided into fast and slow stages, and fast desorption conducting in the gastric fluid lasted shortly and slow desorption occurred in intestinal fluid; pepsin can enhance the release of MMA in gastrointestinal system. While, the acidic condition in gastric fluid is the main factor which causes the release of MMA. The amount of MMA released from CNTs in different fluids follows the order gastric > background (pH = 2.0) > intestinal (fed) > intestinal (fasted) > background (pH = 7.5). These findings in the simulated gastrointestinal system suggest that the release of MMA from CNTs could be promoted by biomacromolecules (such as pepsin and bile salts in digestive tract); thus, the bioavailability of MMA is enhanced.

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Effects of oil dispersant and oil on sorption and desorption of phenanthrene with Gulf Coast marine sediments

Cited by 44 publications

References 39 publications

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

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

Effects of Oil and Dispersant on Formation of Marine Oil Snow and Transport of Oil Hydrocarbons

Adsorption/desorption and bioavailability of methamphetamine in simulated gastrointestinal fluids under the presence of multiwalled carbon nanotubes

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