Current techniques for measuring nano/microplastic (N/MP) concentrations in soil require the soil organic matter content to be separated and have limited resolution for analyzing N/MPs sized |1 m.
Current techniques for measuring nano/microplastic concentrations in soil require the soil organic matter content to be separated and have limited resolution for analyzing N/MPs sized<1 m. Therefore, researchers have developed a novel yet simple method to measure N/MP concentration in different soil types using spectroscopy at two wavelengths. This method does not require the soil to be separated in order to detect the N/MPs and can accurately quantify N/MPs regardless of their size.
Current techniques for measuring N/MP concentrations in soil require separating the soil organic mattercontent through chemical and physical processes. Subsequently, the isolated N/MPs are analyzed using a microscope, Fourier-transform infrared spectroscopy, Pyrolysis-gas chromatography/mass spectrometry, or Raman spectrometry. However, these techniques require advanced skills and have limited resolution for analyzing N/MPs smaller than 1 µm.
The researchers found that a wavelength combination of 220-260 nm and 280-340 nm had the lowest error level for the six samples and was thus found to be suitable for measuring N/MP concentrations in different soil types. They also created a calibration curve between the concentration of N/MPs in the soil suspensions and N/MP content added to the dry soil samples.
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