WP3 will provide SUN partners released and aged materials for (eco)toxicological studies. WP3 will develop methods to analyze and characterize MN released from actual products and modelling tools to predict release and transformation of manufactured nanomaterials (and their agglomerates/aggregates) over the whole lifecycle. This work will result in calculation of Predicted Environmental Concentrations (PEC) in air, freshwater,sediment and soil.