Toolkit for micro to nanoplastic analysis

UNSW SMaRT Centre researchers' most recent study on microplastics has been published by the Royal Society of Chemistry and provides a toolkit to better understand environmental impacts of waste plastic particles.

The study, “A comprehensive toolkit for micro- to nanoplastic analysis”, found that the focus on plastics waste should now be more on nanoplastics, which are much smaller than and non-visible like microplastics.

Supported with funding from the Australian Government under the National Environmental Science Program's Sustainable Communities and Waste Hub, headed by SMaRT and Prof Veena, the study advanced this field by consolidating and critically assessing a micro-to-nano toolkit that integrates mass-based, particle-based, and imaging methods, highlighting their respective strengths, limitations, and complementarities. 

By identifying key methodological gaps - such as the lack of reference materials, harmonized protocols, and validated nanoscale techniques - the research provides a roadmap for generating reliable, comparable, and environmentally realistic MNP data. 

The report, by SMaRT's Dr Rumana Hossain and Prof Veena Sahajwalla, found that these advances are crucial for understanding the environmental fate, transport, and impacts of MNPs, thereby informing risk assessment, policy, and mitigation strategies. Looking ahead, the next breakthrough in micro- and nanoplastic (MNP) research will not come from incremental improvements in detection limits alone but from a paradigm shift toward integrative, automated, and predictive analysis. 

It found that analytical chemistry, materials science, data science, and environmental modelling must converge to build an end-to-end analytical ecosystem—one that links sampling, pretreatment, detection, and interpretation within a single, interoperable framework. 

"Artificial intelligence and machine learning will play a central role by enabling automated spectral classification, pattern recognition of polymer mixtures, and data-driven correction of measurement biases. Future progress will also hinge on sensor miniaturisation and field deployability, allowing real-time MNP monitoring through portable spectroscopic or electrochemical devices. These tools could eventually support continuous surveillance in drinking water, wastewater, and atmospheric monitoring networks."

"Another transformative direction lies in coupling analytical precision with environmental relevance. This means moving beyond particle counts to define exposure thresholds and toxicity-relevant metrics that can inform risk-based regulation. Integrating MNP analytics with omics-based biological assays and computational toxicology models will enable predictive understanding of how particle properties—size, surface chemistry, and aging state—govern bioavailability and effects. Equally, cross-disciplinary efforts should aim to design benign-by-design polymers whose environmental signatures can be rapidly identified by standardised analytical fingerprints, reducing future uncertainty."

"Ultimately, the breakthrough insight for the field is to treat MNP analysis not merely as measurement science but as a dynamic, systems-level discipline that unites advanced instrumentation, data integration, and policy translation. Achieving this synthesis will transform MNP detection from an analytical challenge into a cornerstone of sustainable materials management and environmental protection."