Plastics and Micro/Nano-Plastics (MNPs) in the Environment: Occurrence, Impact, and Toxicity

Area of Science:

• Environmental Science
• Ecotoxicology
• Materials Science

Background:

• Ubiquitous use of plastics across various sectors leads to substantial plastic waste accumulation.
• Environmental factors like climate change and weathering accelerate the breakdown of plastic waste into micro and nano-plastics (MNPs).
• MNPs are pervasive in soil, water, and air, posing a greater environmental threat than larger plastic debris.

Purpose of the Study:

• To review the sources, occurrence, and environmental fate of primary and secondary MNPs.
• To discuss the uptake, internalization, and toxicological effects of MNPs in plants, animals, and humans.
• To provide future perspectives on managing MNP pollution.

Main Methods:

• Literature review of published articles and internet resources.
• Keyword searches included "plastic waste," "degradation," "microplastic," "aging," "internalization," and "toxicity."
• Synthesis of information on MNP entry, aging, uptake, and toxicity.

Main Results:

• MNPs originate from primary sources and secondary degradation processes, entering soil, water, and air.
• Aging processes alter MNP properties, influencing their environmental behavior and biological interactions.
• Evidence suggests uptake and internalization of MNPs by various organisms, with associated toxicity concerns.

Conclusions:

• Micro and nano-plastics represent a significant and growing environmental concern due to their widespread presence and potential toxicity.
• Further research is needed to fully understand the long-term impacts of MNPs on ecosystems and human health.
• Effective waste management strategies are crucial to mitigate MNP pollution.