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Full-Text Articles in Engineering
Visualizing The Fate And Distribution Of Pahs In Spartina And Avicennia Tissues From Barataria Basin, La, Kristina Jeannette Sebastian
Visualizing The Fate And Distribution Of Pahs In Spartina And Avicennia Tissues From Barataria Basin, La, Kristina Jeannette Sebastian
LSU Master's Theses
During crude oil spill events, vegetation in marsh environments sequester polycyclic aromatic hydrocarbons (PAHs) from the crude oil by partitioning from the air phase through the waxy cuticle on the leaf surface. Recent studies from Macondo oil-impacted marshes have demonstrated that cycling of low molecular weight petrogenic PAHs occurs through the cuticle and other leaf tissue. At present, our understanding of how PAHs travel through the cuticle is coarse and limited by grab samples across the entire leaf, which preventing a full understanding the dynamics of PAH cycling in this environment. Multiphoton (MP) confocal microscopy visualizes the distribution of PAHs …
Cuticle Accumulation Of Petrogenic Pahs On Spartina Alterniflora: A Novel Exposure Pathway For Marsh Biota, Joyce Gabriel Kassenga
Cuticle Accumulation Of Petrogenic Pahs On Spartina Alterniflora: A Novel Exposure Pathway For Marsh Biota, Joyce Gabriel Kassenga
LSU Master's Theses
Louisiana coastal marshes were heavily impacted by the 2010 Deepwater Horizon oil spill. MC252 oil pollution in coastal marshes lead to the exposure of biota to polycyclic aromatic hydrocarbons (PAHs). PAHs are persistent organic pollutants that can reside and accumulate in marsh biota. The aim of this study was to investigate the uptake mechanisms of PAHs by Spartina alterniflora at heavily oiled Bay Jimmy marsh in Barataria Basin, Louisiana. Study objectives were to quantify and investigate the uptake mechanisms of PAHs in the leaves of Spartina. The plant/air partitioning of PAHs was studied using a fugacity approach to determine their …
Biogeochemical Controls On Fate Of Subsurface Oiled Sands On A Coastal Headland Beach, Autumn Anastasia Westrick
Biogeochemical Controls On Fate Of Subsurface Oiled Sands On A Coastal Headland Beach, Autumn Anastasia Westrick
LSU Master's Theses
The fate of subsurface oiled sands collected from Fourchon Beach in Louisiana were determined while modifying biogeochemical controls on the degradation of PAHs. Groundwater on the beach has intrinsically low dissolved oxygen concentrations, which may limit natural biodegradation of the crude oil components. The intent of this research was to characterize the biogeochemical properties and degradability of oiled sands (with >10% of pore filled with MC252 oil) using a combination of laboratory flow-through reactor studies, field measurements and time-series microelectrode profiles of down-flow and cross flow geometries. Reactor experiments indicate that optimal conditions for substantial oil degradation are aerobic under …
Uptake And Deposition Of Pyrogenic And Petrogenic Pahs On Spartina Alterniflora, Yasmin Mohammad
Uptake And Deposition Of Pyrogenic And Petrogenic Pahs On Spartina Alterniflora, Yasmin Mohammad
LSU Master's Theses
Saline marshes dominated by Spartina alterniflora were impacted by MC252 crude oil along Louisiana’s shoreline. Two locations were evaluated in this study; a lightly oiled, saline marsh near Port Fourchon, LA and a less saline, heavily oiled marsh near Bay Jimmy in the Barataria Basin, LA. Objectives of this study were to develop a method to extract polycyclic aromatic hydrocarbons (PAHs) from Spartina leaves and to compare and contrast the relative uptake and deposition of petrogenic and pyrogenic PAHs in Spartina leaves. A three-step sequential extraction procedure was developed for the extraction and analysis of PAHs on Spartina leaves. In …
Pah Degradation In Wetland Soils As Influenced By Redox Potential, Haoxuan Zhang
Pah Degradation In Wetland Soils As Influenced By Redox Potential, Haoxuan Zhang
LSU Master's Theses
Polycyclic aromatic hydrocarbons (PAHs) are a common contaminant in wetland soils. They are a group of compounds widely distributed in the environment and tend to accumulate in soils. Major contribution to removal of PAHs is biological degradation. For investigating the biodegradation potential of PAHs influenced by tidal actions, equipment was built for simulating the tidal actions, and concentrations of phenanthrene, pyrene, and benzo[e]pyrene were added to the soils samples which were collected from wetland. Experiments were then conducted over 120 days. Redox potentials and PAHs concentrations were measured and analyzed. Results are concluded: 1) influenced by tidal action, phenanthrene, pyrene, …