Oil dispersants

Oil dispersants are chemicals designed to break up oil. They have been released into the ocean in large quantities following major oil spills, including the 1989 Exxon Valdez spill in Alaska, the 1978 Amoco Cadiz spill off the coast of Normandy, and the 2010 Deepwater Horizon spill in the Gulf of Mexico. However, dispersants are ineffective in cleaning up the spilled oil, only serving to effectively hide it from public view and TV cameras by dispersing it throughout the water column. Chemicals used as oil dispersants are frequently toxic and releasing them into the ocean adds to the toxic effect of the oil on the ocean ecosystem and makes the oil harder to clean up. According to Terry Hazen, a microbial ecologist in Berkeley Lab's Earth Sciences Division, "the concentration of detergents and other chemicals used to clean up sites contaminated by oil spills can cause environmental nightmares of their own."

Contents

• Disperants in the 1978 Amoco Cadiz Spill
• Dispersants in the 1989 Exxon Valdez Spill
• Dispersants in the 2010 Deepwater Horizon Spill
• Government Oversight of Dispersants
• U.S. Government Cover-Up of Toxicity of Dispersants
• Articles and resources
  • Related SourceWatch articles
  • References
  • External resources
  • External articles

Disperants in the 1978 Amoco Cadiz Spill

In 1978, the Amoco Cadiz oil tanker released 227,000 tons of oil three miles off the coast of Normandy, France. Some areas were treated with dispersants, whereas other areas were not. Five years after the spill, the areas not treated with dispersants had recovered. However, the areas treated with dispersants had not recovered 30 years later, according to ecological studies.

Dispersants in the 1989 Exxon Valdez Spill

In 1989, the Exxon Valdez oil tanker spilled 11 million gallons of oil into Prince William Sound in Alaska, impacting 1300 miles of coastline. Dispersants, rich in phosphorous and nitrogen compounds, and fertilizers were released as part of the clean-up effort. The treated areas were "dramatically cleaner" after the first year, but following the second year, scientists observed no improvements and have "grim" hopes for the long-term prospects of the treated area. Microbial ecologist Terry Hazan believes that the nutrients added to the environment, which was naturally low in nutrients, sped up the degradation of oil but also "upset the ecological balance of the system." He predicts, "the severe environmental damage resulting from the spill is expected to persist for decades to come."

Dispersants in the 2010 Deepwater Horizon Spill

In 2010, a blowout at the Deepwater Horizon oil rig in the Gulf of Mexico caused a massive oil spill that gushed from April until August. BP, the company responsible for the spill, emptied millions of gallons of the dispersant Corexit 9500 into the Gulf. BP claims it used 1.8 million gallons of dispersants, a number that is under question and may not be the actual amount actually released.

Government Oversight of Dispersants

In an August 4 hearing, Sen. Barbara Boxer (D-CA), Sen. Sheldon Whitehouse (D-RI), and the Senate Committee on Environment and Public Works questioned the effectiveness and toxicity of the dispersants used in the Deepwater Horizon spill.

U.S. Government Cover-Up of Toxicity of Dispersants

The EPA defended BP's release of dispersants in the Deepwater Horizon spill, insisting that the mixture of oil and dispersants are no more toxic to two marine species tested than oil alone. Also, they maintain that Corexit is "generally no more or less toxic" than other available dispersants. In a letter to the EPA, Rep. Jerrold Nadler challenged their statements, asking about a Swedish study, that used EPA's data but found that "a mixture of oil and dispersant give rise to a more toxic effect on aquatic organisms than oil and dispersants do alone." For more information, see the article U.S. Government Cover-Up of Deepwater Horizon Oil Spill.

Articles and resources

Related SourceWatch articles

• Deepwater Horizon
• U.S. Government Cover-Up of Deepwater Horizon Oil Spill
• BP
• Corexit 9500

References

External resources

• Senate Environment & Public Works Committee, Use of Dispersants in Gulf Oil Spill, Government Panel, C-Span, August 4, 2010.

External articles

• Caution Required for Gulf Oil Spill Clean-Up, Bioremediation Expert Says, Science Daily, May 4, 2010.
• Jerry Cope and Charles Hambleton, "The Crime of the Century: What BP and the US Government Don't Want You to Know, Part I", Huffington Post, August 4, 2010.
• Gotta Laff, "VIDEO- Crime of the Century: What BP & the Government Don’t Want You to Know", Political Carnival, August 6, 2010.
• Ben Gemen, "House Dem questions EPA dispersant defense", The Hill, August 6, 2010.
• Suzanne Goldenberg, "Gulf oil spill: White House accused of spinning report", The Guardian, August 5, 2010.

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