Risks, Release and Concentrations of Engineered Nanomaterial in the Environment

Area of Science:

• Environmental Science
• Materials Science
• Risk Assessment

Background:

• Engineered nanomaterials (ENMs) are increasingly used across various applications.
• Understanding the lifecycle and environmental fate of ENMs is crucial for risk assessment.
• Previous studies have focused on specific ENMs or limited timeframes.

Purpose of the Study:

• To investigate the past, present, and future environmental release of key ENMs (CeO2, SiO2, Ag) from 1950 to 2050.
• To model temporal dynamics of ENM release, considering product application, stock, and end-of-life treatment.
• To compare model predictions with existing measurements and discuss model limitations.

Main Methods:

• Life cycle assessment approach to model ENM release.
• Temporal analysis of ENM release considering use and end-of-life phases.
• Comparison of predicted concentrations with available environmental measurements for Ag- and CeO2-ENMs.

Main Results:

• Predicted freshwater concentrations for CeO2-ENMs range from pg/l (2017) to ng/l (2050).
• SiO2-ENM estimates are ~1000x higher than CeO2, while Ag-ENM estimates are ~10x lower.
• ENMs generally pose low risk in most environmental compartments, with potential localized risks near point sources.

Conclusions:

• The study provides a comprehensive temporal assessment of ENM environmental release.
• Model predictions suggest low overall environmental risk, but highlight potential localized impacts.
• Further research is needed to refine models and address uncertainties in measurements.