A Raman spectral reference library of potential anthropogenic and biological ocean polymers

Area of Science:

• Environmental Science
• Analytical Chemistry
• Marine Biology

Background:

• Microplastic pollution is a pervasive global crisis impacting marine ecosystems and food webs.
• Accurate identification of polymer composition is crucial for determining the origin and fate of marine plastics.
• Visual identification methods are insufficient, and Raman spectroscopy offers a more reliable analysis, but access to spectral libraries is limited.

Purpose of the Study:

• To create and provide an open-access reference library of high-quality Raman spectra for polymers found in marine environments.
• To support the scientific community in accurately identifying and analyzing microplastic pollution.
• To facilitate research into the sources, pathways, and ecological impacts of marine plastic debris.

Main Methods:

• Compilation of a comprehensive Raman spectral library.
• Inclusion of spectra from pristine anthropogenic polymers (n=40) sourced from manufacturers.
• Inclusion of spectra from weathered anthropogenic polymers (n=22) from various environmental sources (consumer, beachcast, agricultural, fishery).
• Inclusion of spectra from biological polymers (n=17) from diverse marine organisms, trophic levels, and tissues.

Main Results:

• A curated, open-access library of broad-spectrum Raman spectra for major marine polymer categories has been established.
• The library contains high-quality spectral data for both pristine and weathered anthropogenic polymers.
• The library also includes spectra of relevant biological polymers, enabling comparative analysis.

Conclusions:

• The developed open-access Raman spectral library is a valuable resource for the scientific community studying marine plastic pollution.
• This library will enhance the accuracy and accessibility of microplastic identification, aiding in the resolution of material origins and ecological impacts.
• Facilitating research through accessible data is key to addressing the global plastic pollution crisis.