(Micro)Plastics Are Toxic Pollutants

Area of Science:

• Environmental Science
• Toxicology
• Ecotoxicology

Background:

• Plastics, particularly microplastics, are increasingly recognized for their harmful effects on organisms, extending beyond physical impacts.
• There is a growing scientific consensus to classify microplastics as persistent, bioaccumulative, and toxic (PBT) substances.
• Understanding the toxicological profile of microplastics is crucial for environmental and health risk assessment.

Purpose of the Study:

• To review and elaborate on the evidence supporting the classification of microplastics as "toxic pollutants".
• To highlight the chemical contaminants associated with microplastics and their release mechanisms.
• To inform global policy initiatives for addressing plastic pollution.

Main Methods:

• Literature review synthesizing existing research on microplastic toxicity.
• Analysis of studies detailing chemical composition and adsorption of environmental contaminants by microplastics.
• Examination of research on the biological impacts of microplastic-associated chemicals on various organisms.

Main Results:

• Microplastics inherently contain toxic chemicals and adsorb external pollutants like PCBs, pesticides, metals, and PAHs.
• Released chemicals from ingested microplastics can negatively affect animal development, physiology, gene expression, and behavior.
• Leachates, weathering, and biofilm formation significantly influence microplastic-biota interactions.

Conclusions:

• Microplastics, due to their chemical load and release potential, should be designated as toxic pollutants.
• Global policies, such as the UN Environment Assembly's treaty, must consider the hazardous chemical aspect of plastics.
• Effective regulation requires acknowledging microplastics as vectors of toxic chemical pollution.