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Plastic debris in freshwater lakes rivals concentrations in oceans

New research suggests that plastic is not just an oceanic problem – scientists found that sediments from Italy's alpine Lake Garda had about the same levels of microplastics as those found in saltwater beaches. 

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Sherri Mason, right, a chemist with State University of New York at Fredonia, works aboard a research vessel on Lake Erie with a device that skims the water surface collecting samples in finely meshed netting. Last year, her team found a surprisingly high concentration of plastics in the Great Lakes.

Courtesy 5gyres.org

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Plastic is leaching not only into the world's salty oceans, but also freshwater mountain lakes.

German scientists studied beach sediments from Lake Garda, a popular tourist destination nestled in Italy's northern alpine region. The freshwater lake is also a source of drinking water and offers a setting in stark contrast to the world's polluted oceans. (By some estimates, as much as 80 percent of seawater litter is plastic.)

But researchers found that this remote, subalpine lake actually contained about as many microplastic particles as scientists have found in marine beach sediments. Using microspectroscopy, the team discovered that the particles typically hailed from larger particles of consumer products. 

"We show that even in a subalpine lake the amount of plastic particles is reaching similar magnitudes as in marine environments," the team wrote in the study.

Among the smaller particles, scientists found polyvinylchloride – considered one of the five most hazardous plastic polymers.

The researchers also warn that the size of the microplastics found on the Lake Garda beaches means a number of freshwater organisms could be ingesting them, creating the risk of build-up in their bodies. 

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