A new research article named “Applicable and cost-efficient microplastic analysis by quantitative 1H-NMR spectroscopy using benchtop NMR and NoD methods” has been published (Magnetic Resonance in Chemistry, First published: 20 August 2021, DOI: (10.1002/mrc.5210)).
The Institute of Integrated Natural Sciences, University of Koblenz-Landau, Germany has written this exciting paper in collaboration with the Magritek application team. It describes how benchtop NMR can be used to quantify a range of polymers at concentrations down to ppm level even in the presence of protonated solvents. For the measurement a Magritek’s Spinsolve 80 MHz spectrometer was used demonstrating its outstanding sensitivity and solvent suppression.
The figure below shows the combination of the NoD method (protonated solvents) and benchtop NMR (80‐MHz spectrometer) for polyethylene terephthalate (PET) particles in CHCl3/trifluoroacetic acid (TFA) 4:1. The graph on the top shows the 1H‐NMR stack plot of 5 different concentrations (0.25–1.5 mg/ml), while the graph at the bottom shows the corresponding 5‐point calibration in the range of 0.3–1.5 mg/ml. Plotted is the microplastic (MP) concentration in mg/ml against the peak integral (♦) together with the corresponding confidence interval and on the secondary axis against the signal‐to‐noise ratio (■).
You can find the full open access paper through the following link: https://analyticalsciencejournals.onlinelibrary.wiley.com/doi/10.1002/mrc.5210