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Taming Waste Heterogeneity for Plastics Circularity with Optimized Sample Preparation Protocols for Quality

Christos Panagiotopoulos1, Christina Podara2, Eleni Gkartzou2

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Recycling plastic waste requires effective sampling and analysis. Cryogenic grinding preserves additives, while melt homogenization improves sample consistency, crucial for circular economy goals.

Keywords:
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Area of Science:

  • Materials Science
  • Environmental Science
  • Analytical Chemistry

Background:

  • Plastic waste streams (PWSs) pose environmental challenges, necessitating efficient recycling for a circular economy.
  • Low homogeneity in sorted PWSs complicates accurate characterization and quality control.
  • Robust sampling and analysis methods are vital for cost-effective plastic recycling.

Purpose of the Study:

  • To develop and evaluate methods for sampling and sample preparation of plastic waste.
  • To accurately identify and quantify polymer types and contaminants like brominated flame retardants (BFRs).
  • To correlate sample preparation steps with analytical result variability and additive preservation.

Main Methods:

  • Utilized an experimental "model waste" approach to simulate PWSs.
  • Compared cryogenic grinding and melt-based homogenization for sample preparation.
  • Employed High-Performance Liquid Chromatography-Mass Spectrometry (HPLC-MS) for additive quantification.

Main Results:

  • Cryogenic grinding minimized degradation of additives, preserving BFR content (461 ± 17 ppm vs. 500 ppm nominal).
  • Melt-based homogenization significantly enhanced sample homogeneity and analytical reproducibility (reduced RSD).
  • Melt homogenization risked thermal degradation of additives, with up to 70% BFR reduction observed.

Conclusions:

  • The choice of sample preparation method impacts the trade-off between homogeneity and additive preservation in plastic waste analysis.
  • Accurate characterization of PWSs is essential for verifying contaminant compliance and evaluating recycling efficiency.
  • The developed experimental approach aids in understanding plastic waste properties and optimizing recycling processes.