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Related Concept Videos

Aggregates Classification01:29

Aggregates Classification

925
Aggregate classification is generally based on its size, petrographic characteristics, weight, and source. Size classification ranges from coarse to fine aggregates, defined by the size of the particles. Coarse aggregates are particles that do not pass through ASTM sieve No. 4, and aggregates that pass through the sieve are fine aggregates.
Petrographic classification groups aggregates based on common mineralogical characteristics. Some of the common mineral groups found in aggregates are...
925

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Related Experiment Video

Updated: Jan 2, 2026

Quantification of Polybutylene Adipate Terephthalate-based Micro- and Nano-plastics from Soil Using Proton Nuclear Magnetic Resonance Spectroscopy
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Quantification of Polybutylene Adipate Terephthalate-based Micro- and Nano-plastics from Soil Using Proton Nuclear Magnetic Resonance Spectroscopy

Published on: June 6, 2025

321

Recycled Plastic Content Quantified through Aggregation-Induced Emission.

Zoé O G Schyns1,2, Thomas M Bennett1,2, Michael P Shaver1,2

  • 1Department of Materials, School of Natural Sciences, University of Manchester, Manchester M13 9BL, U.K.

ACS Sustainable Chemistry & Engineering
|October 3, 2022
PubMed
Summary
This summary is machine-generated.

A new fluorescence method accurately quantifies recycled plastic content, crucial for upcoming EU/UK taxes on single-use plastics. This technique supports enhanced plastic recycling and reduces pollution.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Environmental Science

Background:

  • The linear plastics economy generates significant waste and pollution.
  • Upcoming EU and UK legislation will tax single-use plastics lacking a minimum recycled content threshold (30%).
  • Current methods for determining recycled plastic content are inconsistent and lack quantitative accuracy.

Purpose of the Study:

  • To develop a reliable analytical technique for quantifying recycled content in plastics and packaging.
  • To provide a method compatible with new legislative requirements for recycled content verification.

Main Methods:

  • Utilized a fluorescence-based analytical technique employing 4,4'-bis(2-benzoxazolyl) stilbene (BBS).
  • Analyzed bathochromic shifts from BBS aggregation in high-density polyethylene, polypropylene, and poly(ethylene terephthalate).
  • Quantified simulated recycled content (down to 10 wt%) using fluorescence emission, lifetime, and color properties.

Main Results:

  • Established linear correlations between recycled content and measured fluorescence properties.
  • Demonstrated the technique's independence from sample dimensions and processing conditions.
  • Verified the method's negligible impact on polymer properties and its cost-effectiveness.

Conclusions:

  • The developed fluorescence method offers a robust, inexpensive, and compatible system for verifying recycled plastic content.
  • This technique addresses the current limitations in quantitative determination, supporting legislative goals for increased plastic recycling.
  • The system is well-suited for integration into existing recycling infrastructure.