Spotlight August 2022: Three-stage model for the formation of micro- and nanoplastic particles.

Home > Spotlight August 2022: Three-stage model for the formation of micro- and nanoplastic particles.

Plastic pollution is a global problem that will continue to affect humanity for more than 100 years. There is the visible pollution, e.g. plastic debris in the environment, which leads to death for many animals (because they mistakenly think the plastic is food and eat it or because they get caught in the plastic waste). However, one process that occurs not visible to the naked eye is the decay of large pieces of plastic into smaller fragments (microplastics), which in turn decompose into even smaller particles, called Nanoplastic (more information about nanoplastic in the environment).

How exactly the process of decomposition due to weathering occurs and what exactly happens to nanoplastic particles was investigated in the paper presented here. The starting point for the investigation were plastic pellets in the medium size range of 100- 200 µm, which were exposed to laboratory weathering by water and solar radiation. In this manner, natural weathering by rain and solar radiation in Central Europe was imitated over a period of 1.5 years. The degradation could be divided into 3 main stages. First, the large fragments were smoothed by surface abrasion over a period of up to 17 days and smaller fragments detached (stage 1). After a period of at least 58 days, cracks formed on the plastic surface (stage 2). Finally, the cracks lead to the detachment of smaller particles (stage 3). Up to 14,000 nano- and microplastic particles could form from one original particle. The nanoplastic particles subsequently form larger agglomerates with microplastic particles. This could explain why individual nanoplastic particles are so difficult to detect in the environment. Environmental organisms will thus be exposed to nanoplastic and microplastic particles simultaneously. At the same time, nanoplastic particles bound to natural particles may also enter the food chain.
The experiments on the laboratory weathering of larger pieces of plastic into nano- and microplastic particles provide important insights into the environmental behavior of plastic. They also showed that there are different decomposition processes for different polymers.

 

Original Publication:
Menzel T., Meides N., Mauel A., et al. Degradation of low-density polyethylene to nanoplastic particles by accelerated weathering,
Science of The Total Environment 2022; 826 (154035). https://doi.org/10.1016/j.scitotenv.2022.154035

Spotlight August 2022: Three-stage model for the formation of micro- and nanoplastic particles.

Weitere Spotlights


Spotlight December 2020: Rethinking Nanosafety – Part II

Spotlight December 2020: Rethinking Nanosafety – Part II

In December we would like to draw attention to the special issue: Rethinking Nanosafety – Part II in small. In the July Spotlight we already presented Part I. This special issue “Rethinking Nanosafety – Part II” also features research papers by renowned scientists in the field of nanosafety research. The first part of this special […]

Read more

Spotlight February 2023: New sustainable and promising method to give cotton textiles an antiviral and antibacterial finish

Spotlight February 2023: New sustainable and promising method to give cotton textiles an antiviral and antibacterial finish

Textiles have been the subject of research into functionalization for many years, especially also to repel bacteria and viruses. Since the development of nanotechnological processes, there have been many attempts to incorporate UV protection with nano-titanium dioxide, or to provide textiles with anti-bacterial properties with nanosilver (see cross-sectional text “Nanoparticles in Textiles”). But nanosilver has […]

Read more

Spotlight December 2022: Fighting tumors with micro robots

Spotlight December 2022: Fighting tumors with micro robots

When we, the DaNa team as operators of the website nanopartikel.info, write about nanobots, i.e. nanometre-sized machines, we point out that these machines belong to science fiction, may even remain a utopia – i.e. never realisable. On the significantly larger micro-scale, however, small machines are conceivable that could help in the therapy of diseases, e.g. […]

Read more

Spotlight July 2022: New definition on nanomaterials published

Spotlight July 2022: New definition on nanomaterials published

The European Union has published a new definition for nanomaterials as of June 2022. It is recommended that this be used as a basis for future legislation. The new documents can be found on the EC website. In the new “nanodefinition”, the essential components such as the origin or the size range of the particles […]

Read more

Skip to content