Microplastic contamination found in common source of ground water

Lois Yoksoulian for the University of Illinois at Urbana-Champaign
February 04, 2019
By Lois Yoksoulian for the University of Illinois at Urbana-Champaign
Illinois Sustainable Technology Center researcher John Scott is part of a team of researchers who are among the first to explore microplastic contamination in ground water systems.
Illinois Sustainable Technology Center researcher John Scott is part of a team of researchers who are among the first to explore microplastic contamination in ground water systems. Photo credit: Photo by Fred Zwicky
Urbana-Champaign, IL – A new study has identified microplastic fibres, along with a variety of medicines and household contaminants, in two fractured limestone aquifer systems in Illinois.

The findings are published in the journal Groundwater.

"Plastic in the environment breaks down into microscopic particles that can end up in the guts and gills of marine life, exposing the animals to chemicals in the plastic," said John Scott, a researcher at the Illinois Sustainable Technology Center and study co-author. "As the plastics break down, they act like sponges that soak up contaminants and microbes and can ultimately work their way into our food supply."

Ground water flows through the cracks and voids in limestone, sometimes carrying sewage and runoff from roads, landfills and agricultural areas into the aquifers below, Scott said.

The researchers collected 17 ground water samples from wells and springs – 11 from a highly fractured limestone aquifer near the St. Louis, Mo., metropolitan area and six from an aquifer containing much smaller fractures in rural northwestern Illinois.

All but one of the 17 samples contained microplastic particles, with a maximum concentration of 15.2 particles per litre from a spring in the St. Louis area, the study reports. However, deciphering what that concentration means is a challenge, Scott said. There are no published risk assessment studies or regulations.

The researchers did find, however, that concentrations from their field area are comparable to those of surface water concentrations found in the rivers and streams in the Chicago area, said Samuel V. Panno, an Illinois State Geological Survey researcher and lead author of the study.

"The research on this topic is at a very early stage, so I am not convinced we have a frame of reference to state expectations or bounds on what is considered low or high levels," said Tim Hoellein, a biology professor at Loyola University Chicago and study co-author. "Our questions are still basic – how much is there and where is it coming from?"

The researchers identified a variety of household and personal health contaminants along with the microplastics, a hint that the fibres may have originated from household septic systems.

"Imagine how many thousands of polyester fibres find their way into a septic system from just doing a load of laundry," Scott said. "Then consider the potential for those fluids to leak into the ground water supply, especially in these types of aquifers where surface water interacts so readily with ground water."

There is still a monumental amount of work to be done on this subject, Scott said. He anticipates that microplastic contamination in both surface water and ground water will be a problem for years to come.

"Even if we quit plastics cold turkey today, we will still deal with this issue for years because plastic never really goes away," Scott said. "It is estimated that 6.3 billion metric tons of plastic waste have been produced since the 1940s, and 79 per cent of that is now in landfills or the natural environment. To me, it is such a weird concept that these materials are intended for single use, yet they are designed to last forever."

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