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Scientific Validity Assessment of Microplastic-Free Certification Criteria and Comparison of Thermo-Analytical Detection/Quantification Techniques (TED-GC/MS, Py-GC/MS)
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Researchers evaluated existing microplastic-free certification schemes and compared two thermo-analytical detection methods — TED-GC/MS and Py-GC/MS — finding that Py-GC/MS offered higher sensitivity for some polymers while TED-GC/MS better handled complex matrices, and that mismatches between method detection limits and certification thresholds risk producing unreliable pass/fail decisions.
Microplastics are increasingly recognized as emerging hazardous exposure agents, prompting microplastic-free certification schemes as preventive measures; however, the scientific validity and decision reliability of these schemes remain insufficiently evaluated. This study reviews domestic and international certification criteria from a hazardous materials safety management perspective, focusing on scope, thresholds, analytical requirements, and QA/QC. It also evaluates ISO/DIS 16094-3-based thermo-analytical methods (TED-GC/MS and Py-GC/MS) using polymer-specific LOD/LOQ and representative composite samples. Py-GC/MS generally showed lower detection limits and higher sensitivity for certain polymers under the tested conditions, whereas TED-GC/MS was more suitable for complex matrices and broader polymer characterization. Because mismatches between method capability and certification thresholds can cause false-negative/false-positive decisions, we recommend linking thresholds to method-specific LOD/LOQ, establishing minimum QA/QC for residue evaluation, and differentiating strategies for pass/fail decisions versus quantitative reporting to strengthen defensibility and reproducibility.
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