Plastic-on-Plastic Contamination Risks in Microplastic Research

This technical report discusses the contamination risks associated with microplastics and nanoplastics (MNPs) in laboratory settings. It highlights that MNPs are prevalent in various environmental and biological samples, yet laboratory experiments often occur in environments already contaminated with MNPs. The report outlines major sources of contamination, including pipette tips, plastic tubes, and culture plates, which can introduce background contamination that biases experimental results. It emphasizes the need for a comprehensive understanding of how laboratory-derived particles can inflate reported concentrations and distort dose-response relationships. The authors argue for a contamination-corrected framework for MNP exposure studies to ensure accurate assessments of environmental and health risks. The report also identifies a critical gap in the current research, which is the lack of integrated quantification of plastic contamination across experimental workflows, ultimately affecting the quality of evidence for environmental management and health risk assessment.