Seasonal Monitoring of Hydrocarbon Degraders in Alabama Marine Ecosystems Following the Deepwater Horizon Oil Spill

Horel, Ágota; Mortazavi, Behzad; Sobecky, Patricia A.

doi:10.1007/s11270-012-1097-5

Cited by 20 publications

(18 citation statements)

References 30 publications

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“…Triplicate sediment (10 g) samples were extracted with 1 M NaCl solution and supernatants were analyzed for NO 2 − , NO 3 − , NH 4 + , and PO 4 3+ concentration with a SAN plus System SKALAR auto analyzer as previously described by Horel et al (2012b). Concentrations are presented as mg kg −1 dry weight sediment.…”

Section: Inorganic Nutrient Analysesmentioning

confidence: 99%

“…Sediment samples were prepared for microbial enumeration as previously described in detail by Horel et al (2012b). Specifically, triplicate (1 g) sediment samples were suspended in 10 ml of 1% w/v sodium pyrophosphate (Na 4 P 2 O 7 ) solution with 2% NaCl.…”

Section: Microbial Estimation Dna Extraction Pcr and Microbial Idementioning

confidence: 99%

“…Sediment extractions were dried with anhydrous Na (30 g dry weight per sample) and extracted 3 times with 100 ml methylene chloride solvent as described previously by Horel et al (2012b). Extractions were analyzed with a gas chromatograph (GC) equipped with a flame ionization detector (FID, Shimadzu GC-2014).…”

Section: Total Petroleum Hydrocarbon (Tph) and Carbon Mass Balancementioning

confidence: 99%

“…The flow rate of the carrier gas (Helium) was maintained at 1.3 ml min −1 . The GC column (Restek, Rtx-5) was 30 m length with 0.25 mm internal diameter and 0.25 mm film thickness (Horel et al, 2012b).…”

Section: Total Petroleum Hydrocarbon (Tph) and Carbon Mass Balancementioning

confidence: 99%

See 3 more Smart Citations

Input of organic matter enhances degradation of weathered diesel fuel in sub-tropical sediments

Horel

Mortazavi

Sobecky

2015

Science of The Total Environment

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Section: Inorganic Nutrient Analysesmentioning

confidence: 99%

Section: Microbial Estimation Dna Extraction Pcr and Microbial Idementioning

confidence: 99%

Section: Total Petroleum Hydrocarbon (Tph) and Carbon Mass Balancementioning

confidence: 99%

Section: Total Petroleum Hydrocarbon (Tph) and Carbon Mass Balancementioning

confidence: 99%

See 2 more Smart Citations

Input of organic matter enhances degradation of weathered diesel fuel in sub-tropical sediments

Horel

Mortazavi

Sobecky

2015

Science of The Total Environment

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“…It has been estimated that between 4.2 and 4.9 million barrels of oil were released making it the largest accidental oil spill in history. [1][2][3] Numerous studies have examined the fate and impact of released Macondo oil within the plume [4][5][6][7][8] , on the surface of the Gulf 5,9,10 , buried in ocean sediments (either directly or as marine snow) 6,10 , in marshes [11][12][13][14] , and on beaches. 10,12,14-19 Not surprisingly, the environmental fate of the oil was influenced by many well documented weathering processes.…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

Impact of Photooxidation and Biodegradation on the Fate of Oil Spilled During the Deepwater Horizon Incident: Advanced Stages of Weathering

Harriman

Zito

Podgorski

et al. 2017

Environ. Sci. Technol.

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While the biogeochemical forces influencing the weathering of spilled oil have been investigated for decades, the environmental fate and effects of “oxyhydrocarbons” in sand patties deposited on beaches are not well-known. We collected sand patties deposited in the swash zone on Gulf of Mexico beaches following the Deepwater Horizon oil spill. When sand patties were exposed to simulated sunlight, a larger concentration of dissolved organic carbon was leached into seawater than the corresponding dark controls. This result was consistent with the general ease of movement of seawater through the sand patties as shown with a 35SO4 2– radiotracer. Ultrahigh-resolution mass spectrometry, as well as optical measurements revealed that the chemical composition of dissolved organic matter (DOM) leached from the sand patties under dark and irradiated conditions were substantially different, but neither had a significant inhibitory influence on the endogenous rate of aerobic or anaerobic microbial respiratory activity. Rather, the dissolved organic photooxidation products stimulated significantly more microbial O2 consumption (113 ± 4 μM) than either the dark (78 ± 2 μM) controls or the endogenous (38 μM ± 4) forms of DOM. The changes in the DOM quality and quantity were consistent with biodegradation as an explanation for the differences. These results confirm that sand patties undergo a gradual dissolution of DOM in both the dark and in the light, but photooxidation accelerates the production of water-soluble polar organic compounds that are relatively more amenable to aerobic biodegradation. As such, these processes represent previously unrecognized advanced weathering stages that are important in the ultimate transformation of spilled crude oil.

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Influence of Crude Oil on Denitrification in Subtidal Sediments in the Northern Gulf of Mexico

Kleinhuizen

Mortazavi

2017

CLEAN Soil Air Water

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In this study the impact of hydrocarbons on nitrogen cycling in intertidal sediments from a barrier island in the north central Gulf of Mexico was investigated. Initial total petroleum hydrocarbon (TPH) concentrations of the sediments averaged 49 ± 27 mg kg−1 in June and 75 ± 48 mg kg−1 in November. Following the addition of crude oil, TPH concentrations increased to 340 ± 73 and 296 ± 50 mg kg−1 in June and November, respectively. Sediment oxygen demand (SOD), inorganic nitrogen and phosphorus fluxes, and denitrification capacity, measured with the isotope pairing technique (IPT) within a week of oiling, were consistently higher in June compared to rates in November when temperatures were 10°C lower. Despite significantly higher TPH concentrations in the oiled treatments, SOD, nutrient fluxes, nitrogen fixation, denitrification, and anammox, did not differ between the treatments. Potential denitrification rates, measured in the presence of excess nitrate (100 μM), were similar between the control and oil treatments, but significantly higher than rates measured with the IPT. The elevated rates of potential denitrification suggest the presence of an active extant microbial community capable of significant attenuation of porewater nitrate concentrations. The insignificant changes in nitrogen cycling in response to petroleum hydrocarbon additions at a site with hydrocarbons present, albeit at low concentrations, suggests resiliency in nitrogen cycling in response to additional hydrocarbon inputs in ranges investigated in this study.

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Seasonal Monitoring of Hydrocarbon Degraders in Alabama Marine Ecosystems Following the Deepwater Horizon Oil Spill

Cited by 20 publications

References 30 publications

Input of organic matter enhances degradation of weathered diesel fuel in sub-tropical sediments

Input of organic matter enhances degradation of weathered diesel fuel in sub-tropical sediments

Impact of Photooxidation and Biodegradation on the Fate of Oil Spilled During the Deepwater Horizon Incident: Advanced Stages of Weathering

Influence of Crude Oil on Denitrification in Subtidal Sediments in the Northern Gulf of Mexico

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