May 14th, 2010
Chemical Pollutants . Environmental Pollution
Oil Spills and the Dangers of Chemical Dispersants
The problem about some of these methods is that they take time to execute and none is guaranteed to work. Every method is just one of many in a list of possible ways to contain the oil spill. While each method is applied and only partially works the oil continues to spill into the surrounding environment.
One of the more worrying methods of dealing with the oil involves the use of chemical dispersants. These chemicals are used primarily to break up the oozing oil, allowing it to decompose more quickly or evaporate before washing ashore.
In a recent test, more than 3,000 gallons of chemical dispersant was shot into the well in order to ‘weaken’ the effects of the oil.
But how much chemical dispersant will be needed to control the worst effects of the oil spill?
Corexit 9500 is one of main agents used in the dispersant and it is known as a moderate human health hazard that can cause eye, skin and respiratory irritation. No-one knows the long term effects of this chemical on humans and animal life. Environmental tests have already confirmed that it is bioaccumulative and can be stored in the fatty tissue of living organisms. It is also quite persistent as tests discovered that more than half of it was stored in sediment with only a relatively small amount dissolving in water.
It seems that dispersants do not remove oil. How could they? Oil is an extremely complex organic liquid. But what it seems to do is relocate it from the shores where it is visible to the water column and sea floor where its effects are not so obvious.
The environmental impacts of chemical dispersants are not really known. So far there haven’t been used in extremely worrying amounts but the possibility exists in this particular situation concerning the Deepwater Horizon oil spill.
It seems that the toxic effects of the chemicals present in dispersants may be more tolerable than the damaging effects of the oil itself. All we can do is wait and see.
For more information go to:
Silent Spring
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May 26th, 2010
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June 14th, 2010
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June 15th, 2010
I would be interested to know your source that says that dispersants are bioaccumulative. Everything I’ve read indicates that the Corexit products do not bioaccumulate.
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