The Health consequences of the Deepwater Horizon oil spill are health effects related to the explosion of the Deepwater Horizon offshore drilling rig in the Gulf of Mexico on April 20, 2010. An oil discharge continued for 84 days, resulting in the largest oil spill in the history of the petroleum industry, estimated at approximately 206 million gallons (4.9 million barrels). The spill exposed thousands of area residents and cleanup workers to risks associated with oil fumes, particulate matter from Controlled burns, volatile organic compounds (VOCs), polycylic aromatic hydrocarbons (PAHs), and heavy metals.[1]
The spill was also notable for the volume of Corexitoil dispersant used to help disperse the oil. Although approved by the EPA, no toxicology studies had been done at this time. In 2011, a toxicology study was done and it reported 57 chemicals in the ingredients including chemicals associated with cancer, skin irritation from rashes to burns, eye irritation, potential respiratory toxins or irritants; and kidney toxins.[2]
At the height of operations (summer of 2010), response vessels numbered about 7,000 and personnel numbered over 47,000; as of January 2013, that figure has dropped to about 935. The maximum extent of shoreline oiling involved almost 1,100 miles of shoreline and as of December 2012, approximately 339 miles of oiled shoreline remained subject to evaluation and/or cleanup operations.[3]
Acute toxicity symptoms have been reported and the study of long-term medical and psychological effects is ongoing.[1] As the largest marine oil spill in history, the potential for physical, psychological, and socioeconomic difficulties and long term effects remain unknown. Considering the number of residents and clean-up workers exposed, it has been seen as the most demanding on-water response in U.S. history. Only a few studies have looked at long-term health consequences, it is assumed that the spill's impacts are wide-reaching and will have long-lasting effects.[1]
Reports of health effects
Workers return to landing off St. George Island after BP spill cleanup June, 2010
People can be exposed to the chemicals in oil by breathing them, swallowing, or touching them. Previous studies show consistent evidence of acute toxic effects, mainly neurological, ocular (eye), and respiratory, of those living in exposed communities and among clean-up workers.[1] While the spill was ongoing the Centers for Disease Control and Prevention (CDC) reported that some residents along the coast reported smelling odors and experiencing nausea, headaches, eye, nose, and throat irritation; however, the CDC said that their tests found that air quality levels for ozone and particulates were normal on the Gulf coastline for that time of year and odor-causing pollutants associated with petroleum products were being found at low levels."[4]
By 21 June 2010, 143oil spill exposure cases had been reported to the Louisiana Department of Health and Hospitals; 108 of those cases involved workers in the clean-up efforts, while 35 were reported by gulf residents.[5] Writing in The Nation, Antonia Juhasz reported that according to the health departments of Louisiana, Mississippi and Alabama, from June to September 2010, when they stopped keeping track, more than 700people sought health services with complaints "believed to be related to exposure to pollutants from the oil spill." However, she believed the number to be much higher because in her numerous interviews covering over two years, most people did "not know to report their symptoms as related to the oil spill, nor did their physicians ask."[6]
The National Institute for Environmental Health Sciences is sponsoring a study, "Women and Their Children's Health" (WaTCH), which will follow the health issues of 2,500 women and 800 children living along the Louisiana coast. Initial information gathered from questionnaires answered by 224 women "shows a statistically significant relationship between their reported symptoms and exposure to the spill." In the initial period of exposure, the participants reported "wheezing; tightness in chest; shortness of breath; watery, burning or itchy eyes; stuffy, itchy or runny nose; burning in nose, throat or lungs; skin rash; sore or blisters lasting at least three days; severe headaches or migranes; nausea; excessive fatigue or tiredness; diarrhea; sore throat; and being unable to concentrate."[7]
In another study conducted by the Centers for Disease Control and the Alabama Health Department similar health effects were recorded in two coastal counties in Alabama.[7] A Columbia University study on health effects among children in Louisiana and Florida found that more than 40% of 1,437parents living less than 10 miles (16km) from the coast had been directly exposed to the spill and more than a third of the parents reported physical or mental health symptoms among their children.[7]
Scientific evidence
Workers performing decontamination of containment booms used during the Deepwater Horizon oil spill.
Although the spill has resulted in anecdotal evidence of sickness experienced by coastal residents and workers involved in the cleanup, scientific evidence has been scant.[8][9] The spill differed from previous spills in that the leak was at the ocean floor rather than on the surface and the volume of oil spilled and the amount of dispersant used was unprecedented.[10] The Louisiana state health officer stated, "This is more than a spill. This is ongoing leakage of a chemical, and adding chemicals to stop the chemicals. We're feeling like we're in a research lab."[8][9] Moreover, the proximity to populated communities, the number of potentially exposed workers and community members, and the duration of the spill were far greater than any previously studied oil spills. Of more than 40prior major oil spills, only 8 led to studies of health effects and only two of them included any long-term follow-up. According to the researchers at the National Institute of Environmental Health Sciences, early data from the two long-term studies "suggested that respiratory and genotoxicity effects were important to capture, as well as mental health outcomes commonly associated with disasters of this scale."[11]
In June 2010, at the request of the US Department of Health and Human Services, the U.S. National AcademiesInstitute of Medicine held a workshop to discuss known health effects of previous oil spills and how they might apply to the Gulf spill and to coordinate epidemiological monitoring and ongoing medical research.[12] On the second day of the meeting the suicide of William Allen Kruse,[13] a charter boat captain working as a BP clean-up worker, intensified previous expert commentary on the current and likely long-term mental health effects of the ongoing crisis.[14] David Abramson, director of research for Columbia's National Center for Disaster Preparedness, noted the increased risk of mental disorders and stress-related health problems.[15] In August, the group released their conclusions in a report, "Workshop Summary: Assessing the Effects of the Gulf of Mexico Oil Spill on Human Health".[1][16]
In 2011 the Louisiana State University Health Sciences Center did a study to compare the acute health impacts of the spill with the acute health impacts reported from previous spills to predict health impacts in Louisiana as compared with the health impacts reported from prior crude oil spills. The study reported that "Acute health effects in cleanup workers mirrored those reported in cleanup workers following prior oil spills as ranked by systems (and by symptoms)." The study advised that affected individuals "will require long-term surveillance for chronic adverse health effects including cancer, liver and kidney diseases, mental health disorders, and fetal alcohol spectrum disorders."[17]
According to a Newsweek report, cleanup workers were not provided safety equipment by the company, and the safety manuals were "rarely if ever" followed, or distributed to workers. The safety manuals read: "Avoid breathing vapor" and "Wear suitable protective clothing."[18] In 2013, Susan Shaw of the Deepwater Horizon oil spill Strategic Sciences Working Group, stated in an Al Jazeera article, "BP told the public that Corexit was 'as harmless as Dawn dishwashing liquid' ... But BP and the EPA clearly knew about the toxicity of the Corexit dispersants long before this spill." According to Shaw, BP's own safety sheet on Corexit reported that there were "high and immediate human health hazards".[19] The same Al Jazeera article also reported on a study that was published in 2013 in The American Journal of Medicine that reported significantly altered blood profiles of individuals exposed to the spilled oil and dispersants that put them at increased risk of developing liver cancer, leukemia and other disorders;[20] however, BP disputed the methodology of the study and cited federal studies that BP said contradicted the report and supported the company's position that the dispersants did not create a danger to health.[21]
Although most studies relating to Corexit focus mainly on its effectiveness as a dispersant, public pressure to evaluate its safety towards humans after the oil spill and response clean up brought about several studies about the health effects of Corexit, both alone and in conjunction with spilled oil.[22]
In a cohort study that surveyed United States Coast Guard workers who participated in the gulf spill clean up efforts, a dose–response relationship was found between duration of exposure to oil and dispersant and respiratory symptoms including coughing, wheezing, and shortness of breath. Exposure to both oil and dispersant as opposed to just oil was associated with even higher rates of these respiratory issues.[22] The authors also acknowledge that their results on the increased effect of oil and dispersant together are supported by Liu et al., 2016, and that their findings on the specific symptoms associated with dispersant exposure are supported by McGowan et al., 2017.[22][23][24]
Studies on the health effects of the oil dispersant Corexit are careful to distinguish between the two types used during the BP oil spill: EC9500A and EC9527A, as some of the research shows differential interactions with oil and different impacts on human symptoms.[22][23] Although the US EPA completed a series of trials on determining the toxicity of EC900A, which concluded it was “slightly toxic” or “practically non-toxic”, they did not evaluate the toxicity of EC9527A. Even with EX9500A, subsequent studies have shown that it does exhibit toxic effects, and more studies are evaluating the potential toxicity of both types of Corexit, both alone, or in conjunction with spilled oil.
One such epidemiological study showed a statistically significant increase in risk of mild respiratory illness among those exposed to Corexit 9500 and 9527, even after controlling for various factors including oil exposure. Burning in the eyes, the throat, lung, and nose, and tightness in the chest were the most significant values.[24]
NIOSH Health Hazard Evaluations
In May 2010, the National Institute for Occupational Safety and Health (NIOSH) was contacted by BP to conduct a health hazard evaluation (HHE), following the hospitalization of several fishermen working under BP’s Vessels of Opportunity (VoO) program. The VoO program involved the temporary hire of local out-of-work fishermen to remove oil from the Gulf of Mexico, particularly using booming and skimming tactics. The HHE focused on all major offshore response activities, such as booming, skimming, releasing oil dispersants, in situ burning, and general containment and removal of oil. Sampling conducted to test for a wide array of chemicals, gases, particulates, and metals emitted in the offshore work showed that the substances were either undetectable or were below individual occupational exposure limits.[25]
A second HHE was conducted afterwards to assess exposures to workers performing onshore cleanup work. Worker tasks evaluated as onshore work include wildlife cleanup and rehabilitation, beach cleanup, and decontamination and waste management. Exposure to oil residues and other chemicals were found to be minimal for workers assigned to wildlife and beach cleanup duty. Sampling for chemicals, particulates, and noise exposures were found to be below occupational exposure limits for decontamination and waste management activities. For all onshore work, heat stress and ergonomic hazards were found to be the greatest threats to worker safety and health.[25]
Mental health studies
The potential for significant psychological sequelae after indirect exposure to oil spills and other environmental disasters has been well documented. These parallel the psychological distress associated with direct disaster exposure and include symptoms of depression, anxiety, and post-traumatic stress disorder[26]
A 2011 study looked at the psychological impacts of the Gulf spill on Florida and Alabama communities. The study concluded that the current estimates of human health impacts associated with the oil spill may underestimate the psychological impact in Gulf Coast communities that did not experience direct exposure to oil and that income loss after the spill may have a greater psychological health impact than the presence of oil on the immediately adjacent shoreline.[26]
In Louisiana, a unique combination of past environmental exposures, health disparities, and the disaster of the oil spill were found to coincide with mental health problems, primarily depression. Furthermore, social support and income both negatively predicted depression symptoms[27].
The direct economic consequences that the oil spill had on local economies are especially taxing on mental health as shown by a 2015 study.[28]
Due to their location close to shorelines, many communities affected by oil spills are reliant on fishing as the main source of income. Because of this, the loss of income immediately followed by the Deepwater Horizon oil spill was shown to be a major cause of stress and anxiety in affected Mississippi communities, as locals were left without income.[28] Furthermore, studies of previous oil spills as well as of Deepwater Horizon have shown a steep increases in both anxiety, distrust in authorities as well as in alcohol consumption amongst the locals in the immediate period after the events[29].[30]
Oil spills have also been shown to negatively influence the identities and self-perceptions of the locals affected by the event. This phenomenon was explored in a 2012 study, in which Mississippi locals described their losses in the wake of the accident as cultural as well as economic.[31] For many locals fishing was seen as a part of their way of life, regardless of the individual’s main occupation. The damages to fishing in the local areas following the Deepwater Horizon oil spill therefore meant that many locals felt a loss in identity and culture. Because of this, the oil spill presented a sociocultural vulnerability for the locals, alongside the economic losses.[31]
Despite the mental health consequences, efforts specifically targeted at the area are rarely included sufficiently in the compensation and emergency responses following oil spills.[30]
National Institutes of Health study
In 2011, the U.S. Department of Health and Human Services launched the Gulf Long-term Follow-up Study through the National Institute of Environmental Health Sciences. As the largest, most comprehensive study of long-term health effects from an oil spill, the GuLF Study will collect health data on cleanup workers and track them for at least 5years. The study is trying to identify the exposure of workers to a variety of chemicals linked to health problems contained in the oil and natural gas released during the accident, including benzene, ethylbenzene, toluene, xylene, and the chemicals contained in dispersants used during the spill. The team will look at long-term problems such as cancer, birth defects, and psychosocial issues. Dale Sandler, chief epidemiologist for the National Institutes of Health, said she is working to design a study that draws the strongest possible corollaries, even if absolute causation is not possible to determine: "I want to be able to say that workers who did this particular job are more likely to suffer this particular consequence."[32][33] In 2013 it was reported that the agency had completed telephone interviews with more than 32,000 workers, and home visits with 9,967 of those. Preliminary results of testing show that workers are carrying biomarkers of chemicals contained in the oil in their bodies.[7]
The data collected by the GuLF study has been used by other researchers to study specific groups or symptoms. One study looked at the interview data to identify associations between dispersant exposure and health outcomes. Researchers found significant association between exposure and burning in the lungs, nose, or throat, chest tightness, and burning eyes both at the time of the exposure and 1-3 years later at the time of study enrollment.[24]
General population: The Women and Their Children’s Health (WaTCH) Study
A cohort study of almost 2200 Louisiana women found "high physical/environmental exposure was significantly associated with all 13 of the physical health symptoms surveyed, with the strongest associations for burning in nose, throat or lungs; sore throat; dizziness and wheezing. Women who suffered a high degree of economic disruption as a result of spill were significantly more likely to report wheezing; headaches; watery, burning, itchy eyes and stuffy, itchy, runny nose.[34]
Ongoing health surveys
In 2016, award winning documentary filmmaker, Mark Manning,[35] launched a study collecting voluntary health surveys from individuals residing along the Gulf Coast whom experienced adverse health effects after exposure to the 2010 oil spill.[36] The goal of the survey is to track the occurrence of adverse health effects in the area amongst people that were exposed to the oil spill or dispersants from subsequent clean-up efforts.
Chemical exposure
In April 2011, a review article in the New England Journal of Medicine discussed the health consequences of the spill. According to the review, at high doses some crude-oil components cause respiratory, hepatic (liver), renal (urinary system), endocrine (hormonal system), neurologic, hematologic (vascular system), and other systemic effects, while even very low doses can cause mutagenic effects, with cancer of particular concern. The carcinogens of concern in crude oil are benzene and polycyclic aromatic hydrocarbons (PAHs), which are present in oil and in the air as a result of offshore controlled burning of crude oil.[10] During the 2010 BP/Deepwater Horizon Gulf oil spill, an estimated one of every 20 barrels of spilled oil was deliberately burned off.[37][38] Routes of exposure include contact and inhalation.[10] The EPA obtained hundreds of air samples during the spill and a review showed that none of the samples showed concentrations of benzene or other volatile organic hydrocarbons to be above health-based standards. However, the review noted that "although the monitoring was extensive, no monitoring scheme could cover all potentially affected locales".
Speaking before the Department of the Interior, Susan Shaw of the Strategic Sciences Working Group (formed in response to the Deepwater Horizon oil spill), discussed mid- to long-term recovery of the Gulf of Mexico. According to Shaw, "Chemicals in crude oil and dispersants can cause a wide range of health effects in people and wildlife. Highly toxic chemical ingredients such as benzene and polycyclic aromatic hydrocarbons (PAHs) can damage systems in the body, including DNA damage and mutations... Exposure occurs through skin contact, inhalation of contaminated air or soil/sand, and ingestion of contaminated water or food... Crude oil components penetrate the skin and move through cell walls and enter the bloodstream rapidly when they are inhaled or swallowed." Discussing the dispersants used in the spill, Shaw said that they can be more toxic than either oil or solvent alone because dispersants contain solvents that facilitate rapid entry of oil into cells and organs, She stated that "over time, PAH metabolites can be eliminated from the body, but even brief exposure during critical life stages may be sufficient to cause serious long term effects."[39][40]
Toxicologist and marine biologist Riki Ott has also spoken on the toxicity of the spilled crude oil and of the dispersant Corexit, "The dispersants used in BP's draconian experiment contain solvents, such as petroleum distillates and 2-butoxyethanol. Solvents dissolve oil, grease, and rubber. It should be no surprise that solvents are also notoriously toxic to people, something the medical community has long known".[41] Ott noted that the chemicals "evaporate in air and are easily inhaled, they penetrate skin easily, and they cross the placenta into fetuses. For example, 2-butoxyethanol is a human health hazard substance; it is a fetal toxin and it breaks down blood cells, causing blood and kidney disorders". Louisianan's Governor Bobby Jindal said those impacted will be compensated by BP.[42]
An RNA sequencing study found that a combination of Corexit and oil may weaken the cell junctions of airway epithelial cells, which is seen in asthma and cystic fibrosis. The authors of this study posit that the results of this RNA transcriptomic study could provide evidence for the mechanisms through which BP oil spill workers experienced respiratory oxidative stress and associated symptoms.[23]
Gene regulation was studied for both Corexit EC9500A and EC9527A. The study showed harmful effects and interactions between both types of Corexit as well as the oil. Abnormal regulation was detected in the study and both upregulation and downregulation of genes was found.[23]
Specifically, EC9500A without oil was associated with statistical significance in the abnormal regulation of 84 genes, but when mixed with oil, only 4 genes showed significance. This suggests a neutralizing effect of oil on EC9500A. However, EC9527A showed the opposite relationship. By itself, it showed no significant effects on gene regulation. When combined with oil, however, 46 genes showed abnormal regulation. This suggests a synergistic, or interactive effect of oil and EC9527A.[23]
One specific gene that was downregulated was PAMR1, which had statistical significance in both the EC9527A + oil and EC9500A (without oil). PAMR1 has been associated with bronchopulmonary dysplasia. It is thought to play an important role in respiratory physiology. It has also been shown to be a tumor suppressor. Its downregulation could be an important contributor to respiratory disease and tumor growth.[23]
Health claims settlement
On 13 January 2013, US District Judge Carl Barbier approved a medical-benefits portion of BP's proposed $7.8 billion partial settlement. According to the settlement, people living for at least 60 days along oil-impacted shores or involved in the clean-up who can document one or more specific health conditions caused by the oil or dispersants are eligible for benefits.[43] BP also agreed to spend $105 million over five years to set up a Gulf Coast health outreach program and pay for medical examinations.[44]
The Exxon Valdez oil spill was a major environmental disaster that made worldwide headlines in the spring of 1989 and occurred in Alaska's Prince William Sound on March 24, 1989. The spill occurred when Exxon Valdez, an oil supertanker owned by Exxon Shipping Company, bound for Long Beach, California, struck Prince William Sound's Bligh Reef, 6 mi (9.7 km) west of Tatitlek, Alaska at 12:04 a.m. The tanker spilled approximately 10.8 million US gallons (260,000 bbl) of crude oil over the next few days.
An oil spill is the release of a liquid petroleum hydrocarbon into the environment, especially the marine ecosystem, due to human activity, and is a form of pollution. The term is usually given to marine oil spills, where oil is released into the ocean or coastal waters, but spills may also occur on land. Oil spills may be due to releases of crude oil from tankers, offshore platforms, drilling rigs and wells, as well as spills of refined petroleum products and their by-products, heavier fuels used by large ships such as bunker fuel, or the spill of any oily refuse or waste oil.
Lisa Perez Jackson is an American chemical engineer who served as the administrator of the United States Environmental Protection Agency (EPA) from 2009 to 2013. She was the first African American to hold that position.
A dispersant or a dispersing agent is a substance, typically a surfactant, that is added to a suspension of solid or liquid particles in a liquid to improve the separation of the particles and to prevent their settling or clumping.
The Deepwater Horizon oil spill was an industrial disaster which began on April 20, 2010, off the coast of the United States in the Gulf of Mexico on the BP-operated Macondo Prospect, considered the largest marine oil spill in the history of the petroleum industry and estimated to be 8 to 31 percent larger in volume than the previous largest, the Ixtoc I oil spill, also in the Gulf of Mexico. Caused in the aftermath of a blowout and explosion on the Deepwater Horizon oil platform, the United States federal government estimated the total discharge at 4.9 MMbbl. After several failed efforts to contain the flow, the well was declared sealed on 19 September 2010. Reports in early 2012 indicated that the well site was still leaking. The Deepwater Horizon oil spill is regarded as one of the largest environmental disasters in world history.
The Deepwater Horizon drilling rig explosion was an April 20, 2010 explosion and subsequent fire on the Deepwater Horizon semi-submersible mobile offshore drilling unit, which was owned and operated by Transocean and drilling for BP in the Macondo Prospect oil field about 40 miles (64 km) southeast off the Louisiana coast. The explosion and subsequent fire resulted in the sinking of the Deepwater Horizon and the deaths of 11 workers; 17 others were injured. The same blowout that caused the explosion also caused an oil well fire and a massive offshore oil spill in the Gulf of Mexico, considered the largest accidental marine oil spill in the world, and the largest environmental disaster in United States history.
Corexit is a product line of oil dispersants used during oil spill response operations. It is produced by Nalco Holding Company, an indirect subsidiary of Ecolab. Corexit was originally developed by the Standard Oil Company of New Jersey. Corexit is typically applied by aerial spraying or spraying from ships directly onto an oil slick. On contact with the dispersant, oil that would otherwise float on the surface of the water is emulsified into tiny droplets and sinks or remains suspended in the water. In theory this allows the oil to be more rapidly degraded by bacteria (bioremediation) and prevents it from accumulating on beaches and in marshes.
Dispersit SPC 1000 or Dispersit is a dispersant used for oil spills, produced by U.S. Polychemical Corporation.
The following is a timeline of the Deepwater Horizon oil spill. It was a massive oil spill in the Gulf of Mexico, the largest offshore spill in U.S. history. It was a result of the well blowout that began with the Deepwater Horizon drilling rig explosion on April 20, 2010.
This article covers the effect of the Deepwater Horizon disaster and the resulting oil spill on global and national economies and the energy industry.
Following is a Timeline of the Deepwater Horizon oil spill for May 2010.
Following is a timeline of the Deepwater Horizon oil spill for August 2010.
An oil dispersant is a mixture of emulsifiers and solvents that helps break oil into small droplets following an oil spill. Small droplets are easier to disperse throughout a water volume, and small droplets may be more readily biodegraded by microbes in the water. Dispersant use involves a trade-off between exposing coastal life to surface oil and exposing aquatic life to dispersed oil. While submerging the oil with dispersant may lessen exposure to marine life on the surface, it increases exposure for animals dwelling underwater, who may be harmed by toxicity of both dispersed oil and dispersant. Although dispersant reduces the amount of oil that lands ashore, it may allow faster, deeper penetration of oil into coastal terrain, where it is not easily biodegraded.
The Gulf killifish is one of the largest members of the genus Fundulus; it is capable of growing up to 7 inches (18 cm) in length, whereas the majority of other Fundulus reach a maximum length of 4 inches (10 cm). Therefore, F. grandis is among the largest minnows preyed upon by many sport fish, such as flounder, speckled trout, and red drum. Fundulus derives from the Latin meaning "bottom," and grandis means "large". The Gulf killifish is native to the Gulf of Mexico from Texas to Florida and the eastern coast of Florida and the Caribbean Sea in the Atlantic Ocean. Threats to the survival of the Gulf killifish include extreme changes in salinity, changes in temperatures, and toxic events such as the hypoxic dead zone in Louisiana and the Deepwater Horizon oil spill. The Gulf killifish is currently being used to test the effects of oil and oil dispersants on the physiology of marine species affected by these substances. This is significant to conservation biology, because with the continued extraction of oil and other natural resources from North American waters, it has become increasingly important to understand the risks and consequences in worst-case scenarios, such as the Deepwater Horizon oil spill, and the lasting effects on the marine ecosystem.
Riki Ott is a marine toxicologist and activist in Cordova, Alaska. Ott was frequently introduced as an "oil spill expert" in her many media appearances during the height of the 2010 BP Deepwater Horizon oil spill news coverage. After graduating with a doctorate in sedimentary toxicology from the University of Washington, Ott moved to Alaska and started a fishing business. When the Exxon Valdez oil spill disrupted the local fishing-based economy, she became an environmental activist. Since the spill, she has participated in legal and public relations disputes with the Exxon company.
The 2010 Deepwater Horizon oil spill in the Gulf of Mexico has been described as the worst environmental disaster in the United States, releasing about 4.9 million barrels of crude oil making it the largest marine oil spill. Both the spill and the cleanup efforts had effects on the environment.
The Deepwater Horizon oil spill occurred between 10 April and 19 September 2010 in the Gulf of Mexico. A variety of techniques were used to address fundamental strategies for addressing the spilled oil, which were: to contain oil on the surface, dispersal, and removal. While most of the oil drilled off Louisiana is a lighter crude, the leaking oil was of a heavier blend which contained asphalt-like substances. According to Ed Overton, who heads a federal chemical hazard assessment team for oil spills, this type of oil emulsifies well. Once it becomes emulsified, it no longer evaporates as quickly as regular oil, does not rinse off as easily, cannot be broken down by microbes as easily, and does not burn as well. "That type of mixture essentially removes all the best oil clean-up weapons", Overton said.
The GuLF Study, or Gulf Long-term Follow-up Study, is a five-year research project examining the human-health consequences of the Deepwater Horizon oil spill in April 2010. The spill followed an explosion on a drilling rig leased by BP, the British oil company, and led to the release of over four million barrels of oil into the Gulf of Mexico, 48 miles off the coast of Louisiana in the United States.
Susan D. Shaw was an American environmental health scientist, marine toxicologist, explorer, ocean conservationist, and author. A Doctor of Public Health, she was a professor in the Department of Environmental Health Sciences at the School of Public Health at the State University of New York at Albany, and Founder/President of the Shaw Institute, a nonprofit scientific institution with a mission to improve human and ecological health through innovative science and strategic partnerships. Shaw is globally recognized for pioneering high-impact environmental research on ocean pollution, climate change, oil spills, and plastics that has fueled public policy over three decades. In 1983, with landscape photographer Ansel Adams, she published Overexposure, the first book to document the health hazards of photographic chemicals. Shaw is credited as the first scientist to show that brominated flame retardant chemicals used in consumer products have contaminated marine mammals and commercially important fish stocks in the northwest Atlantic Ocean. She became the first scientist to dive into the Gulf of Mexico oil slick following the 2010 BP Deepwater Horizon oil rig explosion to investigate the impacts of chemical dispersants used in response to the spill.
Oil pollution toxicity to marine fish has been observed from oil spills such as the Exxon Valdez disaster, and from nonpoint sources, such as surface runoff, which is the largest source of oil pollution in marine waters.
↑ Diaz, JH (2011). "The legacy of the Gulf oil spill: analyzing acute public health effects and predicting chronic ones in Louisiana". Am J Disaster Med. 6 (1): 5–22. doi:10.5055/ajdm.2011.0040. PMID21466025.
↑ "Gulf Oil Spill Health Hazards". www.sciencecorps.org. 2010.. "This report describes the toxicity of chemicals in crude oil and in the dispersants currently being used in the Gulf area."
"Final report", National Commission on the Deepwater Horizon Oil Spill and Offshore Drilling, 12 January 2011.
Anderson, Aileen. "BP Deepwater Horizon Oil Spill", in S. George Philander (ed.), Encyclopedia of Global Warming and Climate Change, Second Edition, SAGE, 2012, pp.146–147.
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