Rochester Institute of Technology scientists recently developed a 3D mass estimate to show where microplastic pollution is collecting in Lake Erie.
The study examines nine different types of polymers that are believed to account for 75% of the world’s plastic waste.
Plastic behaves differently in lakes than in oceans. Previous studies on both indicated the levels of plastic pollution found on the surface are lower than expected based on how much is entering the water. While massive floating “islands” of accumulated plastic waste are found in oceans, previous studies indicated the levels of plastic pollution found on the surface of Lake Erie are lower than expected based on how much is entering the water.
The new RIT estimate for the 3D mass — 381 metric tons — is more than 50-times greater than the previous estimates at the surface. The study generated the first estimate of how much plastic is deposited on the bottom of the lake. It accounts for the unique properties of different types of plastics and shows that the three polymers with the lowest density — polyethylene, polypropylene and expanded polystyrene — accumulate on the surface of the lake while the other six polymers were concentrated in the sediment.
“Previously, there was a focus on plastics modeled as neutrally buoyant for the most part in the beginning of plastics modeling,” said Juliette Daily, a mathematical modeling doctoral student and author of the study. “In reality, plastic is probably almost never neutrally buoyant. It’s probably always positively or negatively buoyant, which really changes how the particles behave.”
The study shows other patterns, such as plastic particles accumulating more heavily on the eastern shore of the lake, perhaps from the current moving predominantly west to east. This means pollution could be pushed disproportionately to areas like Buffalo. The authors hope other researchers will continue to build on this research and explore how factors like beaching can further explain where plastic particles end up.
“Trying to understand where plastic is going is important for people looking at mitigation or prevention, and will be important for understanding what the most likely impacted areas are,” said Matthew Hoffman, co-author and associate professor in the School of Mathematical Sciences. “Looking at things in the sediment or getting an idea of what is down in the lower levels of the lake will give us a better idea of what concentrations there are and what possible exposure levels are to this ecosystem.”
The study is published in the May 2020 edition of the Marine Pollution Bulletin.