From Circle of Blue (Brett Walton) via EcoWatch:
When Greg Wetherbee sat in front of the microscope recently, he was looking for fragments of metals or coal, particles that might indicate the source of airborne nitrogen pollution in Rocky Mountain National Park. What caught his eye, though, were the plastics.
The U.S. Geological Survey researcher had collected rain samples from eight sites along Colorado’s Front Range. The sites are part of a national network for monitoring changes in the chemical composition of rain. Six of the sites are in the urban Boulder-to-Denver corridor. The other two are located in the mountains at higher elevation.
The monitoring network was designed to track nitrogen trends, and Wetherbee, a chemist, wanted to trace the path of airborne nitrogen that is deposited in the national park. The presence of metals or organic materials like coal particles could point to rural or urban sources of nitrogen.
He filtered the samples and then, in an inspired moment, placed the filters under a microscope, to look more closely at what else had accumulated. It was much more than he initially thought.
“It was a serendipitous result,” Wetherbee told Circle of Blue. “An opportune observation and finding.”
In 90 percent of the samples Wetherbee found a rainbow wheel of plastics, mostly fibers and mostly colored blue. Those could have been shed like crumbs from synthetic clothing. But he also found other shapes, like beads and shards. The plastics were tiny, needing magnification of 20 to 40 times to be visible and they were not dense enough to be weighed. More fibers were found in urban sites, but plastics were also spotted in samples from a site at elevation 10,300 feet in Rocky Mountain National Park.
The findings are detailed in a report published online on May 14.