We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
An extensive characterization of various environmentally relevant microplastics – Material properties, leaching and ecotoxicity testing
AI summary Read the abstract
Researchers conducted a comprehensive study of six different types of environmentally realistic microplastics, testing their physical properties and effects on duckweed plants. The study found that while microplastics did not affect plant growth rates or chlorophyll levels, particles with rough surfaces and sharp edges significantly reduced root length. Microplastics made of Bakelite released particularly high levels of chemical leachates, suggesting that the specific properties of each plastic type matter greatly for assessing environmental risk.
Microplastics in the environment occur in different sizes and shapes and are made of various polymers. Therefore, they also considerably differ in their properties and ecotoxicity. However, the majority of microplastics research uses pre-made spherical microplastics, which practically do not exist in the environment. Our work focused on a comprehensive study of six different types of microplastic that were prepared to simulate common microplastics found in the environment. All types of microplastics where chemically and physically characterized using Fourier-transform infrared spectroscopy, thermal analysis, field-emission scanning electron microscopy, optical microscopy and laser diffraction analysis. The specific surface area was determined using the BET method. Furthermore, effects of microplastics and microplastic leachates on a common duckweed (Lemna minor) were evaluated. All tested microplastics did not affect specific growth rate and chlorophyll a content in duckweed, while microplastics with a rough surface and sharp edges caused a significant reduction of duckweed root length. Microplastics made of Bakelite also showed an intensive leaching, which increased their ecotoxicity potential. Natural particles used as a control did not have any negative effect on duckweed. Overall, microplastic particles have significantly different ecotoxicity profiles depending on their physico-chemical properties. Therefore, the testing of environmentally relevant particles and their proper characterization, as well as the testing of microplastic leaching properties, is crucial for understanding of microplastics ecotoxicological potential.
More Papers Like This
The Effect of Microplastic (MP) Shape on Adsorption and Physiological Responses of Duckweed (Lemna minor)
AI summary Read the abstract
Scientists tested how different shapes of tiny plastic particles (microplastics) affect duckweed plants in freshwater. They found that irregularly shaped plastic fragments damaged plant roots more than round beads or fibers, while other parts of the plants weren't significantly affected. This matters because duckweed and other water plants are part of the food chain that can eventually lead to humans, and understanding how microplastics harm aquatic life helps us predict potential risks to our water systems and food supply.
Impact of polyethylene microbeads on the floating freshwater plant duckweed Lemna minor
AI summary Read the abstract
Researchers exposed duckweed — a small floating freshwater plant — to polyethylene microbeads from cosmetics and found that the beads adhered to the plant surface and reduced growth at higher concentrations. The study highlights how primary microplastics from consumer products can affect freshwater plants even at relatively low doses.
Physiological responses of Lemna minor to polystyrene and polymethyl methacrylate microplastics
AI summary Read the abstract
Researchers exposed duckweed plants to two types of microplastics — polystyrene (PS) and polymethyl methacrylate (PMMA) — and found surprisingly opposite effects: PS microplastics actually promoted plant growth, while PMMA microplastics damaged chloroplasts and stunted growth, showing that plastic type matters greatly for environmental harm.
Ecotoxicity testing of microplastics: Considering the heterogeneity of physicochemical properties
AI summary Read the abstract
Researchers reviewed how the diverse physical and chemical properties of microplastics, including particle size, shape, crystallinity, surface chemistry, and polymer composition, may influence their ecotoxicity. They argue that standard testing with uniform microbeads fails to capture the heterogeneity of environmental microplastics and may lead to inaccurate risk assessments. The study calls for a more structured approach to testing different microplastic properties to identify the key drivers of toxicity.
Do Polystyrene Nanoplastics Have Similar Effects on Duckweed (Lemna minor L.) at Environmentally Relevant and Observed-Effect Concentrations?
AI summary Read the abstract
Researchers compared the effects of polystyrene nanoplastics on duckweed (Lemna minor) at environmentally relevant concentrations versus the higher observed-effect concentrations typically used in studies. The study found that both positively and negatively charged nanoplastics produced different biological responses depending on concentration levels. The findings highlight the importance of testing at environmentally realistic concentrations to accurately assess nanoplastic risks to aquatic plants.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.