Nanoplastics are neither microplastics nor engineered nanoparticles.

Area of Science:

• Environmental Science
• Nanotechnology
• Materials Science

Background:

• Growing concerns about plastic pollution highlight the need to study plastic particles across all size ranges.
• Nanomaterial research, particularly in environment, health, and safety (EHS), offers applicable methods for studying particulate plastics.
• The unique properties of the nanometric size range necessitate specific considerations for plastic particles.

Purpose of the Study:

• To differentiate incidentally produced nanoplastics from microplastics and engineered nanomaterials.
• To highlight the distinct analytical challenges and environmental implications posed by nanoplastics.
• To emphasize the need for specialized approaches in studying nanoplastics' fate and effects.

Main Methods:

• Comparative analysis of nanoplastics' properties against microplastics and engineered nanomaterials.
• Examination of size-dependent characteristics, including transport, light interaction, and surface properties.
• Assessment of heterogeneity, fragmentation potential, and implications for environmental fate and biological interactions.

Main Results:

• Nanoplastics exhibit unique transport, light interactions, and surface characteristics due to their size.
• They possess high particle heterogeneity and fragmentation potential, unlike engineered nanomaterials.
• Nanoplastics differ from microplastics in bioavailability and additive release dynamics.

Conclusions:

• Incidental nanoplastics are distinct from both microplastics and engineered nanomaterials.
• Their unique properties demand specialized analytical methods and risk assessment strategies.
• Further research is crucial to understand the environmental fate and health impacts of nanoplastics.