Study shows microplastics generate damaging chemicals in water
Research in Nature reveals that common plastics produce reactive oxygen species at their surface when submerged in water.
Key points
- Columbia University chemists found six common plastics generate reactive oxygen species in water.
- The study shows microplastics are not chemically inert and can damage biological molecules.
- Hydroxyl radicals were detected on the surfaces of plastic particles over time.
A new study published in Nature demonstrates that microplastics are not chemically inert, challenging the assumption that plastic containers remain passive. Researchers from Columbia University found that these particles generate harmful reactive oxygen species when submerged in water.
Wei Min, a chemist at Columbia University, led the team that conducted the research. They determined that the boundary between water and plastic creates reactive oxygen species, which are known to cause oxidative stress. This finding suggests microplastics may actively contribute to cellular damage rather than just being physical contaminants.
Experimental Evidence of Chemical Activity
The researchers tested polystyrene powder in water mixed with methyl orange dye. Over ten days, the solution lost nearly 90 percent of its color as the dye broke down. The dye remained intact in ethanol or other solvents, indicating that water is required for this chemical reaction to occur.
To confirm the presence of reactive molecules, the team used electron spin resonance. This technique detected hydroxyl radicals, a highly reactive type of reactive oxygen species, in the mixture. A fluorescent sensor further showed that these radicals concentrated on the surfaces of the plastic particles and increased over time.
Scope of Plastic Types Tested
The chemical activity was not limited to polystyrene. The scientists tested six common types of plastics used in everyday products. All six materials generated radicals when exposed to water. The plastics included polyethylene, polypropylene, PVC, PET, and acrylic, alongside polystyrene.
These materials are widely used in bags, food containers, and cups. The study implies that the inert nature of these products is misleading. The generation of reactive oxygen species occurs at the interface where the plastic meets water, potentially affecting anything in contact with the surface.
What should you do?
While the direct health impacts on humans remain under research, the study highlights the chemical potential of microplastics. The findings suggest that the presence of these particles in water and biological systems could lead to molecular damage. Professionals should monitor further developments in this area.
What to do and how to stay safe: microplastics
- Review current water filtration methods to see if they capture microplastic particles effectively.
- Monitor scientific updates regarding the health impacts of reactive oxygen species from plastics.
- Reduce reliance on single-use plastic containers where feasible to limit exposure.
- Support ongoing research into the long-term effects of microplastic ingestion and absorption.
Step-by-step guide: Mobile Device Security: How to Protect Data Beyond Passwords
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
Are microplastics chemically inert?
No, a new study in Nature shows that microplastics generate reactive oxygen species in water, proving they are not inert.
Which plastics were tested in the study?
The researchers tested polystyrene, polyethylene, polypropylene, PVC, PET, and acrylic, all of which generated radicals.
What damage can these chemicals cause?
Reactive oxygen species can damage proteins, lipids, and DNA, potentially breaking DNA strands or causing mutations.
