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Quantitative <sup>1</sup>H-NMR spectroscopy as an efficient method for identification and quantification of PVC, ABS and PA microparticles
Summary
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.
As an extension of the new, size-independent, fast and easy quantitative <sup>1</sup>H-NMR (qNMR) spectroscopy as an alternative method for microplastic (MP) analysis we herein present the possibility to analyze three environmentally highly relevant MP particles by qNMR spectroscopy. The investigations cover polyvinyl chloride (PVC) powder with a size <50 μm, acrylonitrile butadiene styrene (ABS) granules with a size distribution of 100-300 μm, and polyamide (PA) fibres with a length of approx. 500 μm and a diameter of approx. 20-30 μm. For quantification, the integration method or the peak-fitting method combined with the calibration curve method was used. Linearity above 0.99R<sup>2</sup>, precision of 99.1-99.9% and accuracy of 95.6-110% for all three polymer types demonstrate the high analytical potential of the method. Moreover, the limit of detection (40-84 μg mL<sup>-1</sup>) for all polymer types is in the lower environmentally relevant range.
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