Though ocean-borne plastic trash has a reputation as an indestructible, immortal environmental villain, scientists announced yesterday that some plastics actually decompose rapidly in the ocean. And, the researchers say, that’s not a good thing.
The team’s new study is the first to show that degrading plastics are leaching potentially toxic chemicals such as bisphenol A into the seas, possibly threatening ocean animals, and us.
Scientists had previously thought plastics broke down only at very high temperatures and over hundreds of years.
The researchers behind a new study, however, found that plastic breaks down at cooler temperatures than expected, and within a year of the trash hitting the water.
The Japan-based team collected samples in waters from the U.S., Europe, India, Japan, and elsewhere, lead researcher Katsuhiko Saido, a chemist with the College of Pharmacy at Nihon University in Japan, said via email.
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, said Saido, who presented the findings at a meeting of the American Chemical Society in Washington, D.C., today.
Plastic, he said, should be considered a new source of chemical pollution in the ocean.
http://news.nationalgeographic.com/news/2009/08/090820-plastic-decomposes-oceans-seas.html
