We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Misidentification of PVC microplastics in marine environmental samples
AI summary Read the abstract
This review examines why PVC is consistently underreported in environmental microplastic surveys despite being the third most produced polymer in Europe, finding that UV weathering dramatically alters PVC spectral signatures and can cause misidentification as polyethylene. The authors call for inclusion of weathered PVC standards in spectroscopic reference databases used for environmental monitoring.
Poly(vinylchloride), PVC, is the third most demanded polymer in Europe although its presence in marine ecosystems, surprisingly, is scarcely observed. This does not reflect neither its production nor its widespread usage. Therefore, it is imperative to understand why this may happen. PVC is the least stable of the high-tonnage produced polymers as it has the highest sensitivity towards UV radiation and, therefore, photo-degradation is of maximum relevance. The big amount of additives included in PVC formulations, weathering and the different treatments required to isolate it from environmental samples can modify the surface of PVC microplastics, making their spectral identification/quantification an analytical challenge. All these factors can lead to large PVC underestimations in environmental studies, in which other polymers like PE, PP or PS outstand. Further, the fact that the infrared spectrum of weathered PVC can be confounded with that of PE is of most relevance and, therefore, remarkable misidentifications and/or wrong quantifications may occur. In this work some relevant factors that can explain the low percentages of PVC reported in the literature are discussed and special emphasis is made on the need for suitable spectroscopic databases that include PVC weathered standards. This has been confirmed by the results of a detailed study of PVC weathering under pilot-scale conditions, monitoring its spectroscopic and physical changes over time.
More Papers Like This
Impact of weathering on the chemical identification of microplastics from usual packaging polymers in the marine environment
AI summary Read the abstract
The impact of environmental weathering on the chemical identification of common microplastics was investigated, examining how UV radiation, mechanical abrasion, and microbial activity alter the spectroscopic signatures used for polymer identification. Weathered plastics were harder to correctly identify than pristine ones, highlighting the need for reference libraries that include aged material.
Polymer weathering under simulated solar radiation and comparison to stormwater and estuarine microplastics
AI summary Read the abstract
Researchers weathered polyethylene and polypropylene plastics under simulated sunlight in water for 90 days and compared their spectral changes to those found in environmental microplastics from stormwater and estuaries. They found that polypropylene degraded faster than polyethylene and that spectral databases had difficulty accurately identifying heavily weathered plastics. The study highlights challenges in identifying and age-dating microplastics found in the environment.
Reliable thermal mass quantification of PVC – an ongoing challenge
AI summary Read the abstract
Researchers tested whether pyrolysis-based thermal analysis can reliably quantify polyvinyl chloride (PVC) in environmental microplastic samples, finding that no definitive chemical marker exists because PVC's breakdown products are shared by many other polymers. This makes accurate PVC quantification in complex environmental samples currently unfeasible, a significant gap for monitoring plastic pollution.
Pyrolysis-GC/MS Reference Data for Polymeric and Refractory Materials to Evaluate C-PVC Indicator Specificity
AI summary Read the abstract
This paper provides a reference dataset of chemical fingerprints — generated by pyrolysis gas chromatography-mass spectrometry — to help researchers accurately identify chlorinated polyvinyl chloride (C-PVC) microplastics in environmental samples without confusing them with other materials. Environmental samples often contain complex mixtures of polymers, charcoal, soot, and natural materials that can produce overlapping signals, so having validated reference data is essential for reliable microplastic identification. Better analytical tools for distinguishing plastic types will improve the accuracy of microplastic contamination assessments.
Spectral analysis of environmental microplastic polyethylene (PE) using average spectra
AI summary Read the abstract
Researchers analyzed the spectral properties of polyethylene microplastics collected from Tokyo Bay's surface waters. The study found that the shape, color, and weathering history of microplastic particles all affect their spectral signatures, and suggests that using oxidized polyethylene as a reference standard may improve the accuracy of identifying environmental microplastics.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.