A new study finds elevated levels of caffeine（咖啡因） at several sites in Pacific Ocean waters off the coast of Oregon -- though not necessarily where researchers expected. This study is the first to look at caffeine pollution off the Oregon coast. It was developed and conducted by Portland State University master's student Zoe Rodriguez del Rey and her faculty¹ adviser² Elise Granek, assistant professor of Environmental Science and Management, in collaboration³ with Steve Sylvester of Washington State University, Vancouver.

 

In spring 2010, Rodriguez del Rey and Granek collected and analyzed⁴ samples from 14 coastal⁵ locations and seven adjacent water bodies as far north as Astoria, Ore., and as far south as Brookings.

 

Locations were identified as potentially polluted if they were near wastewater treatment plants, large population centers or rivers and streams emptying into the ocean.

 

The study found high caffeine levels near Carl Washburne State Park (Florence, Ore.) and Cape⁶ Lookout⁷, two areas not near the potential pollution sources, yet low levels of caffeine near large population centers like Astoria/Warrenton and Coos Bay.

 

High levels were also found following a late-season storm of wind and rain that triggered sewer⁸ overflows⁹.

 

Results of the study were published in the July 2012 Marine¹⁰ Pollution Bulletin, "Occurrence and concentration of caffeine in Oregon coastal waters."

 

The results seem to indicate that wastewater treatment plants are effective at removing caffeine, but that high rainfall and combined sewer overflows flush the contaminants out to sea. The results also suggest that septic tanks, such as those used at the state parks, may be less effective at containing pollution.

 

"Our study findings indicate that, contrary to our prediction, the waste water treatment plants are not a major source of caffeine to coastal waters," says Granek. "However, onsite waste disposal systems may be a big contributor of contaminants to Oregon's coastal ocean and need to be better studied to fully¹¹ understand their contribution to pollution of ocean waters."

 

Caffeine is found in many food and beverage¹² products as well as some pharmaceuticals¹³, and caffeine pollution is directly related to human activity (although many plant species produce caffeine, there are no natural sources of the substance in the Northwest). The presence of caffeine may also signal additional anthropogenic pollution, such as pesticides¹⁴, pharmaceuticals and other contaminants（污染物） .

 

Even "elevated levels" of caffeine are measured in nanograms per liter, well below a lethal¹⁵ dose for marine life. However, an earlier study by Rodriguez del Rey and Granek on intertidal mussels showed that caffeine at the levels measured in this current study can still have an effect despite the lower doses.

 

"We humans drink caffeinated beverages¹⁶ because caffeine has a biological effect on us -- so it isn't too surprising that caffeine affects other animals, too," says Granek. Previous studies have found caffeine in other bodies of water around the world, including the North Sea, the Mediterranean¹⁷, Puget Sound, Boston Harbor, and Sarasota Bay, Fla.

点击收听单词发音