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Papers
61,005 resultsM. Sc
Researchers developed a workflow using high-resolution nuclear magnetic resonance (NMR) spectroscopy — including quantitative 1H NMR and 2D 1H-13C HSQC NMR — to identify and precisely quantify microplastic polymer types in environmental surface water samples at atomic resolution, independent of particle size. The method provides unambiguous polymer identification and mass quantification, offering a rigorous alternative to imaging-based approaches for microplastic characterization.
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Researchers developed a workflow using high-resolution nuclear magnetic resonance (NMR) spectroscopy to identify and quantify microplastics in environmental surface water samples, enabling unambiguous polymer identification and precise mass quantification at atomic resolution independent of particle size.
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Researchers proposed a workflow for examining microplastic contamination in environmental surface water samples using high-resolution nuclear magnetic resonance (NMR) spectroscopy, enabling simultaneous unambiguous polymer identification and precise quantification at atomic resolution independent of particle size. The NMR-based approach offered advantages over conventional spectroscopy methods by providing structural-level chemical characterization without size-based detection thresholds.
High-resolution NMR spectroscopic approaches to quantify PET microplastics pollution in environmental freshwater samples
Researchers developed a workflow using high-resolution nuclear magnetic resonance spectroscopy to detect and quantify polyethylene terephthalate microplastic contamination in environmental water samples. The NMR-based approach enables unambiguous identification and precise measurement of PET particles in surface waters. The study offers a promising new analytical tool for monitoring microplastic pollution that complements existing detection methods.
Unlocking the potential of NMR spectroscopy for precise and efficient quantification of microplastics
Researchers demonstrated that nuclear magnetic resonance (NMR) spectroscopy can precisely identify and quantify six common plastic polymer types — including polystyrene and PVC — at concentrations as low as 0.2 micrograms per milliliter, outperforming traditional methods. This advance offers a faster, more accurate tool for measuring microplastic contamination in environmental samples.
The first application of quantitative 1H NMR spectroscopy as a simple and fast method of identification and quantification of microplastic particles (PE, PET, and PS)
Researchers demonstrated that quantitative ¹H NMR spectroscopy (qNMR) can identify and quantify polyethylene, PET, and polystyrene microplastic particles in solution with linearity above R²=0.994 and detection limits in the environmentally relevant range (~19–21 μg/mL), offering a faster size-independent alternative to conventional FTIR and Raman particle counting.
Identification and quantification of polystyrene microplastics in marine sediments facing a river mouth through NMR spectroscopy
Researchers explored the use of nuclear magnetic resonance spectroscopy to identify and quantify polystyrene microplastics in marine sediments near a river mouth. The study demonstrated that NMR can serve as a complementary analytical tool for microplastic detection, offering advantages in polymer identification accuracy compared to some conventional methods.
Applicable and cost‐efficient microplastic analysis by quantitative 1 H‐NMR spectroscopy using benchtop NMR and NoD methods
Researchers demonstrated that low-cost benchtop NMR spectrometers can be used to quantify microplastics in solution, making the technique more accessible and affordable for routine environmental monitoring. This advance could help expand microplastic testing beyond well-funded research labs.
Microplastic quantification in environmental samples with complex organic matrices by diffusion NMR
Researchers applied diffusion NMR spectroscopy to quantify microplastics in environmental samples with complex organic matrices, demonstrating the technique's capacity to characterize polymer types in difficult real-world sample conditions where existing methods fall short.
Simultaneous quantification of microplastic particles by non-deuterated (NoD) 1H-qNMR from samples comprising different polymer types
Researchers developed a non-deuterated proton quantitative NMR method that can simultaneously identify and quantify multiple polymer types in microplastic mixtures, offering a faster and more cost-effective analytical approach.
Quantitative 1H-NMR spectroscopy as an efficient method for identification and quantification of PVC, ABS and PA microparticles
Quantitative proton NMR spectroscopy was validated as a fast, size-independent method for measuring the mass of PVC, ABS, and polyamide microplastics in solution. This analytical technique complements visual and spectral methods, offering an efficient way to quantify plastic contamination in environmental or food samples.
Applicability of NMR spectroscopy to quantify microplastics across varying concentrations in polymer mixtures
Quantitative NMR spectroscopy was evaluated as a method for measuring synthetic polymers in mixed microplastic samples at low concentrations, finding it feasible but constrained by overlapping signals and solvent limitations, offering a cost-efficient alternative to spectroscopic methods for certain polymer mixture analyses.
Overcoming the challenge of quantifying aged microplastic by qNMR spectroscopy
Researchers evaluated quantitative nuclear magnetic resonance spectroscopy for analyzing environmentally aged microplastics made of polystyrene, polyvinyl chloride, and polyethylene terephthalate. The study found that UV exposure and elevated temperatures during aging altered the spectral properties of these polymers, and developed approaches to overcome the quantification challenges posed by environmental weathering.
Highly selective solid–liquid extraction of microplastic mixtures as a pre-preparation tool for quantitative nuclear magnetic resonance spectroscopy studies
Researchers developed a solid-liquid extraction procedure using common laboratory equipment to selectively separate microplastic mixtures from inorganic matrix substances as sample preparation for quantitative NMR spectroscopy. The protocol addresses a key gap preventing qNMR from being applied to real environmental microplastic samples containing diverse polymer mixtures.
Low molecular weight polymers in aquatic environments as pollutants of emerging concerns: recovery, quantification and microstructure
This study developed a new method using solution NMR spectroscopy to isolate and quantify low-molecular-weight synthetic polymers (polyethylene and PDMS) directly from seawater, bypassing some limitations of traditional spectroscopic approaches. The analytical advance matters because accurate quantification of dissolved and near-dissolved polymer debris in marine water is essential for assessing true human and ecological exposure to plastic contamination.
Quantitative analysis of PET microplastics in environmental model samples using quantitative 1H-NMR spectroscopy: validation of an optimized and consistent sample clean-up method
Researchers proposed a new mass-based method for quantifying PET microplastics in environmental samples that enables comparisons across different sample matrices. Standardizing how microplastics are measured — particularly reporting mass rather than just particle counts — would improve the comparability of data from different studies.
The power of a multi-technique approach for the reliable quantification of microplastics in water
Researchers applied a multi-technique analytical approach combining several spectroscopic and microscopic methods to improve the reliability of microplastic quantification in environmental samples. The combined approach reduced false positives and improved polymer identification accuracy compared to any single method used alone.
Identification of Microplastics Using a Custom Built Micro-Raman Spectrometer
Researchers built a custom micro-Raman spectrometer and demonstrated its use for identifying microplastic polymer types in environmental samples, achieving sensitive and specific polymer identification at particle sizes down to a few micrometers.
Identification of microplastics and associated contaminants using ultra high resolution microscopic and spectroscopic techniques
A new procedure combining ultra-high resolution microscopy and spectroscopy was developed to simultaneously characterize micro- and nanoplastics and identify contaminants adsorbed to their surfaces in aquatic samples. The method enables more comprehensive analysis of the complex pollutant mixtures associated with environmental microplastic particles.
Feasibility of using quantitative 1H-NMR spectroscopy and ultra-microbalances for investigation of a PET microplastic reference material
Researchers validated quantitative NMR spectroscopy and ultra-microbalances as complementary tools for measuring PET microplastic mass in reference materials, finding both methods produced consistent results within standard deviations — supporting their use in large-scale inter-laboratory comparisons.
Detection and identification of microplastics directly in water by hyperspectral imaging
Researchers used hyperspectral imaging to identify different types of microplastics mixed together in water, demonstrating that the technique can distinguish polymer types based on their spectral signatures. This non-destructive, real-time method could improve the speed and accuracy of microplastic monitoring in water samples.
A comparison of microscopic and spectroscopic identification methods for analysis of microplastics in environmental samples
Researchers compared microscopic and spectroscopic methods for analyzing microplastics in environmental samples, evaluating accuracy and efficiency and finding that spectroscopic confirmation substantially reduces misidentification errors.
Recent developments in mass spectrometry for the characterization of micro- and nanoscale plastic debris in the environment
This review examines advances in mass spectrometry techniques for characterizing micro- and nanoplastic debris in environmental samples, covering particle sizing, polymer identification, and quantification approaches. Improved mass spectrometry methods are expanding the ability to detect and characterize nanoplastics, which are particularly challenging to measure with conventional spectroscopic approaches.
Towards a quantitative approach for the accurate analysis of blended microplastics based on 3-D micro-Raman spectroscopy
Researchers developed a quantitative 3D micro-Raman spectroscopy approach for accurately analyzing blended microplastic particles composed of multiple polymer types, addressing the challenge that environmentally released microplastics often originate from complex multi-polymer blended materials.