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More Horror from Deepwater Horizon Oil Spill

oil platform

Deepwater Horizon, it was a technological feat to get oil that deep in the water. Then the spill occurred, when it happened I honestly think more people were in shock than angry. We had never dealt with an oil spill like that before, much less one in the heart of such a huge fishing community. Louisiana business suffered and probably continues to suffer from the spill and the tons of oil that were spilled. Frankly the people in charge freaked out and just did everything they could to clean it up as quickly as possible. That unfortunately included the use of lots and lots of dispersants [chemicals to break up oil so nature can degrade and break down the oil more quickly].

The 2010 Deepwater Horizon spill in the Gulf of Mexico was the largest accidental release of oil into the ocean. The accident spilled roughly 210 million gallons gushing from the blown out well. In an attempt to prevent vast quantities of oil from fouling beaches and marshes, BP applied 1.84 million gallons of chemical dispersant to oil released in the subsurface and to oil slicks at the sea surface. The dispersant was originally thought to rapidly degrade in the environment [although frankly, this was the largest use of it and what happens in the Lab doesn’t always happen in nature].

A new study by researchers has found that the dispersant compound DOSS, which decreases the size of oil droplets and hampers the formation of large oil slicks, remains associated with the oil and can persist in the environment for up to four years, yes that is a bad thing. The study examined samples collected from deep-sea corals and surrounding sediments collected in Dec. 2010 as well as oil-soaked sand patties found on coastal beaches since July 2010 to the present.

“We found DOSS persisted in variable quantities in deep-sea coral communities 6 months after the spill and on Gulf of Mexico beaches 26−45 months after the spill,” said lead author Helen White, an assistant professor of chemistry with Haverford College. “These results indicate that the dispersant, which was thought to undergo rapid degradation in the water column, remains associated with oil in the environment and can persist for around 4 years.”

When they found dispersant in the deep-sea samples they analyzed, it did not come as a surprise to the researchers. Earlier work by co-author Elizabeth Kujawinski and her colleagues found DOSS was slow to degrade in the deep ocean, which I am sure brings up the question to why it was used in the first place.

“The deep sea is cold and dark and the degradation of dispersant components happens much more slowly under these conditions,” said Kujawinski, an associate scientist at WHOI. “The interesting thing is that the sand patties we’re finding on beaches four years after the spill have DOSS in them. That was somewhat unexpected.”

White and her colleague Chris Reddy at WHOI have been monitoring the beaches for oiled samples since the time of the spill. This fieldwork is part of an effort to gain as much understanding about the geographical and temporal distribution of the sand patties.

For this study the researchers developed a method to isolate the DOSS from the solid sand patties. Prior to this study, dispersant had only been analyzed in aqueous samples. White then sent the isolated compounds to Kujawinski’s lab, where researchers used sophisticated instruments to quantify the DOSS in samples collected from environments known to contain oil persisting from the DWH oil spill.

“The amounts we detected are quite small, but we’re finding this compound in locations where we expected the dispersants to disappear, either by dissolving in water or by being degraded by bacteria,” said Kujawinski.

What does the presence of DOSS in deep-sea sediments and corals and in sand patties on Gulf beaches mean for marine life or for the people who frequent the beaches?  The scientists say the honest answer is, they just don’t really know.

 “It’s hard to say because we don’t know how toxic it might be. The EPA has determined what concentrations of DOSS may be harmful to marine life in the water, but the toxicity of DOSS in solid (non-aqueous) forms like sediments or sand patties is not known,” said White. “We know that if you measure ‘x’ amount of this compound in ‘y’ amount of water, that’s toxic. But you can’t compare those numbers to what we’ve found in the sand patties because we’re looking at this compound in a mixture of sand and oil.”

Until more is known about the toxicity of oil and dispersant mixtures, some Gulf beaches have signs to warn people not to touch the sand patties. The researchers are eager for their findings to be known by other scientists studying the Deepwater Horizon spill.

“We want to get this information out there because there are other scientists who are studying similar samples,” said White. “When they ask questions about which microbes are living in the samples or how the oil is changing over time, it’s really important to consider that the samples also contain dispersants.”

So what’s in the future, they hope to focus future research on gaining a better understanding of why dispersant compounds are able to persist in the environment for so long. In particular, they are interested in learning how they escape degradation in coastal environments where temperatures are higher for a significant part of the year and there is more exposure to sunlight.

“The dispersant was not expected to persist for so long,” Kujawinski said. “Now that we know that it can be found up to 4 years after the spill, there is even more need to understand it and any impacts it may have on the environment.”

Plain and simple we freaked out, the people in charge dropped the ball and now we have a mess… still. I am not sure what is scarier, the fact that oil is still coming up on the beaches, meaning there is still potentially large amounts of it out in the ocean waters, or the fact that we just don’t know what these chemicals will do in the environment. Either way, it’s a scary feeling. Especially if you are living anywhere near by.

Want the full study? You can find that —here!


White, H., Lyons, S., Harrison, S., Findley, D., Liu, Y., & Kujawinski, E. (2014). Long-Term Persistence of Dispersants following the Deepwater Horizon Oil Spill Environmental Science & Technology Letters, 1 (7), 295-299 DOI: 10.1021/ez500168r


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