Source-specific identification, characterization, and control of MPs across a remote, rural and urban gradient.

In the context of the widespread occurrence of microplastics (MP) in the Canadian environment, our project aims to support the adoption of effective MP mitigation policies based on understanding sources, pathways, and evaluating selected control strategies. We have 4 approaches. (1) We are developing new analytical tools to enable MP identification and classification, including developing high affinity MP ligands to allow for sensitive and specific MP identification in complex media (Awada et al. 2022). (2) We are investigating air, water and soil transport pathways, total loadings and source contributions across remote (Dorset), agricultural (Thames River), and urban (Etobicoke Creek) watersheds in Ontario. A necessary prerequisite is developing replicable, repeatable and representative harmonized sampling and sample preparation methods. Here, we are evaluating four air sampling methods, comparing and testing water sampling methods, and developing optimized sample preparation methods involving digestion procedures. (3) We are testing mitigation measures, namely Litta Traps and bioretention cells, both of which are intended to capture MPs in stormwater and that are proving to be useful methods. (4) We are developing a knowledge network that includes private and public sector stakeholders that could implement innovations and/or best practices arising from the study. [ABSTRACT FROM AUTHOR]