Here’s the good news: Plastic may break down in the ocean in as little as a year, not 500 to 1,000 years as scientists previously thought. Now, the bad news: This degradation could be releasing harmful compounds such as bisphenol A (BPA) into the ocean, according to research presented at the American Chemical Society meeting on Wednesday.
Ocean-borne plastic, such as that in the vast Great Pacific Garbage Patch, has traditionally been viewed as an environmental hazard due to the danger it can pose to sea life and birds. But to find out more about how plastic behaves when in the ocean, researchers acquired water samples from Japan, India, Europe, the United States, and other locations. The results? All the water samples were found to contain derivatives of polystyrene, a common plastic used in disposable cutlery, Styrofoam, and DVD cases, among other things [National Geographic News].
In another experiment simulating the breakdown of plastic in the ocean, researchers “found that plastic in the ocean actually decomposes as it is exposed to the rain and sun and other environmental conditions, giving rise to yet another source of global contamination that will continue into the future” [BBC]. As the plastic breaks down, it releases BPA, a compound shown to throw off rats’ hormone systems, along with another potentially harmful substance called styrene trimer. The toxins could not only pose a threat to marine life, but also to humans who eat seafood.
Still, some experts wonder if all of the ocean’s plastic really dissolves, since much of it may sink into the depths of the oceans where the water is generally calm, dark, and cold. For example, the plastic polystyrene is heavier than water, so it sinks. Because temperatures are much lower at the bottom of the ocean and there’s very little light to cause photodegredation, [ocean researcher Charles] Moore said it’s unlikely that the plastic would break down once it sunk. “Food doesn’t even biodegrade at the bottom of the ocean” [Wired.com], Moore says. Meanwhile, pollution expert Joel Baker contends that the chemical releases are insignificant compared to the amount of water in the oceans. While he agrees that the plastic garbage in the ocean should be cleaned up, “There’s a little bit of hyperbole going on here,” Baker said [Wired.com].
Related Content:
80beats: Ships Set Sail to Examine the Vast Patch of Plastic in the Pacific Ocean
80beats: Plastic-Devouring Bacteria Could Keep Soda Bottles Out of Landfills
80beats: BPA Won’t Leave the Public-Health Conversation–or Your Body
DISCOVER: The World’s Largest Dump: The Great Pacific Garbage Patch
DISCOVER: The Dirty Truth About Plastic
Image: flickr / Vagabond Shutterbug
August 21st, 2009 at 5:12 pm
There’s some good news out there in all this. Plastic bottles which are made from PET do not leach BPA’s. PET plastic is heavier than water…try this in the sink or pool, fill a water bottle or soda bottle with water and place it in the pool….it sinks pretty fast. PET will break down from sun light and wave mechanical action and when the bottle no longer holds air it will sink. We would rather see all bottles recycled, reused or disposed of properly. Our bottle, the ENSO biodegradable bottle is designed to recycle and if it finds its way into a landfill, it biodegrades. My personal opinion is that if all plastics were biodegradable many of the problems we are encountering with plastic would go away. Remember, there is a difference between plastics that are compostable, degradable or biodegradable. Compostable plastics such as PLA which is mostly made from corn, does not biodegrade. PLA will compost but only in a commercial composting site. Try finding a commercial composting site near you that will take PLA which is made of genetically modified corn. And let’s not forget degradable plastics. Degradable plastics break down, degrade, into smaller and smaller pieces, it doesn’t go away it just gets too small to see. Biodegradable plastic such as the ENSO bottle with EcoPure is designed to biodegrade in a microbial environment leaving behind biogases and humus. Biogases in a landfill are known as LFG’s and are being used to create clean energy. Clean energy from a plastic bottle…now that’s a novel idea.
Max
http://www.ensobottles.com
August 21st, 2009 at 8:01 pm
maybe microbes have found a way to devour plastic! Maybe there going to destroy all our plastic things!
August 22nd, 2009 at 1:12 pm
So can we please just make everything from legos now?
August 22nd, 2009 at 1:12 pm
It seems to me that ultimately we as a species will have to manufacture far less plastic, and reuse 100% of what we do manufacture. I’d recommend an obscure but brilliant little book on this topic, “Cradle to Cradle” ( http://www.amazon.com/Cradle-Remaking-Way-Make-Things/dp/0865475873 ).
August 23rd, 2009 at 3:05 am
i’d like to point out that you can make completely biodegradable plastic that is just as good as plastic made from petroleum out of hemp. And there is no toxic chemical biproduct. Of course if you go that far you can make biodiesel out of hemp as well lolol.
August 23rd, 2009 at 11:37 am
All plastics will decompose into harmless substances when the sun expands and envelopes the earth!
August 25th, 2009 at 7:55 am
Finally, a real environmental concern, not the pathetic attempt at taxing life (the lies around global warming).
This, as well as depleted uranuim and gmo should be the priorities for people.