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Effect of PET Micro/Nanoplastics on Model Freshwater Zooplankton
Summary
Researchers created micro- and nanoplastic particles from PET plastic through mechanical grinding in water, mimicking natural degradation processes, and tested their effects on freshwater zooplankton. They found that smaller, irregularly shaped nanoplastic particles were more toxic than larger ones, causing reduced survival and reproduction in the test organisms. The study highlights that as plastic debris breaks down into ever-smaller particles in waterways, the biological risks to aquatic life may actually increase.
Micro- and nanoplastic pollutants are among the major environmental challenges, and are exacerbated by the continuous degradation of growing amounts of plastic debris in the aquatic environment. The purpose of this study was to investigate the morphology of micro/nanoplastics (M/NPs) formed from polyethylene terephthalate (PET) by mechanical degradation in an aquatic environment, which mimics the processes in the natural environment well, and to determine the impact of these particles on model aquatic organisms. To this end, M/NPs were obtained by ball milling in an aqueous medium and the effect of milling length on particle size and shape was investigated. The particles obtained in an environment simulating natural conditions were irregularly shaped, and those of nanometric size tended to form aggregates of various shapes. The ingestion and toxicity of PET M/NPs to freshwater zooplankton were then assessed. Daphnia magna and Thamnocephalus platyurus were used in a series of acute ecotoxicity tests, by exposure to M/NP dispersions at environmentally realistic concentrations (0.01-1.0 mg/L), as well as at very high concentrations (100-1000 mg/L). A significant uptake of PET particles by both types of invertebrates was observed, and the M/NPs were mainly concentrated in the digestive tracts of the crustaceans. However, they did not cause acute toxicity to the tested organisms or a reduction in their swimming activity, even at concentrations as high as 1000 mg/L.
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