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20 resultsShowing papers similar to Characterizing photochemical ageing processes of microplastic materials using multivariate analysis of infrared spectra
ClearCharacterizing photochemical ageing processes of microplastic materials using multivariate analysis of infrared spectra
Scientists studied how sunlight breaks down tiny plastic particles (microplastics) that end up in our environment, finding that different types of plastic degrade at very different rates when exposed to UV light. This matters because as these plastics break down and change chemically, they may become better or worse at picking up and carrying harmful chemicals that could eventually reach humans through food and water. The research helps us better understand how long different plastics persist in nature and how their ability to transport pollutants changes over time.
Modelling the Photodegradation of Marine Microplastics by Means of Infrared Spectrometry and Chemometric Techniques
Researchers modeled the photodegradation of polyethylene and polypropylene marine microplastics using infrared spectrometry and chemometric techniques, tracking structural and chemical changes during accelerated UV aging that simulated five years of solar exposure.
μ-FTIR Reflectance Spectroscopy Coupled with Multivariate Analysis: A Rapid and Robust Method for Identifying the Extent of Photodegradation on Microplastics
Researchers developed a faster, more sensitive method for identifying weathered microplastics using infrared reflectance spectroscopy combined with statistical analysis. The technique can classify different plastic types and assess their level of sun damage without complex data preprocessing. The approach could improve the speed and accuracy of environmental microplastic monitoring, particularly for particles that have been altered by exposure to sunlight.
Microplastic fouling: A gap in knowledge and a research imperative to improve their study by infrared characterization spectroscopy
Researchers analysed 4,042 infrared spectra of polystyrene, polyethylene, and polypropylene microplastics collected from the Mediterranean Sea using principal component analysis, identifying that spectral variability in weathered marine microplastics is primarily driven by three processes: chemical ageing, organic fouling, and inorganic fouling.
Monitorization of polyamide microplastics weathering using attenuated total reflectance and microreflectance infrared spectrometry
Researchers monitored the weathering of polyamide (nylon) microplastics using attenuated total reflectance and microreflectance infrared spectrometry, finding that natural aging produces spectral changes that can make weathered plastics difficult to identify against standard reference databases.
Quantifying UV-Driven Aging of Sub-10 µm Airborne Microplastics with High-Resolution µFTIR-ATR Imaging
Researchers developed a high-resolution infrared imaging method to quantify UV-driven aging in airborne microplastics smaller than 10 micrometers. The technique uses a fourth-derivative oxidation index to resolve overlapping chemical signatures, enabling sensitive analysis of PET surface oxidation at the single-particle level. When applied to ambient samples from Japan and Cambodia, the method revealed clear regional differences in microplastic aging that corresponded to local UV exposure levels.
Short-wave infrared hyperspectral imaging of microplastics: Effects of chemical and physical processes on spectral signatures and detection capabilities
Researchers evaluated short-wave infrared hyperspectral imaging for rapid microplastic detection and polymer identification, testing the effects of various physical and chemical weathering agents on spectral signatures and finding the technique effective for identifying multiple polymer types in complex samples.
Weathering-independent differentiation of microplastic polymers by reflectance IR spectrometry and pattern recognition
Researchers developed a weathering-independent method for identifying microplastic polymer types using reflectance infrared spectrometry combined with pattern recognition techniques including principal components analysis and classification trees, demonstrating reliable polymer differentiation even when field samples are weathered or biofouled.
Quantifying UVC-Induced Aging of Microplastics Using a Multivariate Aging Score
Researchers examined how UVC radiation ages three common types of microplastics and found that polypropylene degraded far more rapidly than polyethylene or PET, developing widespread surface cracks and generating secondary plastic fragments. They developed a multivariate aging score that combines chemical and physical measurements to better quantify how microplastics deteriorate over time. The study also found that colored polypropylene products aged faster than transparent ones, highlighting how product formulation influences environmental breakdown.
Photoaging of Typical Microplastics as Affected by Air Humidity: Mechanistic Insights into the Important Role of Water Molecules
Researchers developed in situ spectroscopic methods to study how air humidity affects microplastic photoaging, finding that water molecules play an important role in accelerating the degradation of polyethylene microplastics on land surfaces.
Analysis of aged microplastics: a review
This review looks at how microplastics change over time in the environment through exposure to sunlight, temperature changes, and biological activity. Aging alters the surface properties of microplastics, which can make them more toxic and change how they interact with other pollutants. Advanced techniques like infrared and Raman spectroscopy are the best current methods for identifying and tracking these aged microplastics in environmental samples.
The effect of weathering environments on microplastic chemical identification with Raman and IR spectroscopy: Part I. polyethylene and polypropylene
Researchers compared Raman and IR spectroscopy for identifying weathered polyethylene and polypropylene microplastics, finding that weathering significantly alters surface chemistry and that Raman spectroscopy is more robust for identifying heavily weathered samples than IR spectroscopy.
MIR spectral characterization of plastic to enable discrimination in an industrial recycling context: III. Anticipating impacts of ageing on identification
Researchers characterized how UV weathering alters the mid-infrared spectra of five common waste electrical and electronic equipment plastics and found that while oxidation introduces new spectral features, characteristic polymer signals remain distinguishable, meaning aged plastics can still be reliably identified by MIR hyperspectral sorting systems.
Screening of polymer types and chemical weathering in macro- and meso-plastics found on lake and river beaches using a combined chemometric approach
Researchers developed a combined chemometric approach using ATR-FTIR and Raman spectroscopy to screen polymer types and assess UV-induced chemical weathering in macro- and meso-plastics collected from lake and river beaches, finding that oxidation and carbonyl group formation are key markers of environmental degradation.
Fourier Transform Infrared Spectroscopy to Assess the Degree of Alteration of Artificially Aged and Environmentally Weathered Microplastics
Researchers used Fourier transform infrared (FTIR) spectroscopy to compare the chemical weathering of microplastics collected from an Italian river with artificially aged plastic samples. They found that environmental microplastics showed distinct patterns of chemical degradation that differed from lab-accelerated aging. The study demonstrates how FTIR analysis can serve as a useful tool for assessing how long microplastics have been exposed to environmental conditions.
Degradation degree analysis of environmental microplastics by micro FT-IR imaging technology
Researchers used micro-FTIR spectral-image fusion to classify the degradation degree of polyethylene microplastics collected from coastal environments, achieving 97.1% classification accuracy and enabling estimation of environmental persistence time from spectral data.
Enhanced Identification of Weathered Plastics Through the Improvement of Infrared Spectral Libraries
Researchers developed an improved infrared spectral library specifically designed to identify weathered and degraded plastics that conventional libraries often misidentify. The new library increased match rates by 7.3% for thermally oxidized plastics and improved identification of mechanically abraded samples, addressing a significant gap in accurate microplastic detection and environmental risk assessment.
Optimizing spectral classification and oxidation estimation of environmental Microplastics
Researchers conducted an intercalibration exercise using 200 FTIR spectra from sea surface floating microplastics analyzed on two different spectrometers, comparing spectral preprocessing methods and library-matching tools to assess identification reliability for weathered environmental particles. They also calculated the carbonyl index for 2,000 spectra from marine floating microplastics across multiple polymer types, finding high variability in oxidation levels that complicates comparisons with accelerated aging experiments.
UV sources and plastic composition influence microplastic surface degradation: Implications for plastic weathering studies
This study tested how different UV light sources change the surface of common microplastics like polyethylene, polypropylene, and polystyrene. The results show that sunlight and lab UV lights weather plastics differently, changing their surface roughness and chemical makeup -- which matters because these surface changes affect how microplastics transport pollutants and interact with living organisms in the environment.
Unveiling microplastic spectral signatures under weathering and digestive environments through shortwave infrared hyperspectral sensing
Weather exposure and digestive processes significantly alter the chemical structure of microplastics — creating new carbonyl and vinyl groups detectable by shortwave infrared hyperspectral sensing — which complicates their identification in environmental samples. This study built a comprehensive spectral database of weathered and digestion-degraded plastics and showed that hyperspectral sensing can still correctly identify roughly 80% of these altered particles, offering a fast, large-area screening tool that could improve environmental microplastic monitoring.