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Picogram-Level Nanoplastic Analysis with Nanoelectromechanical System Fourier Transform Infrared Spectroscopy:

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A new NEMS-FTIR method rapidly detects and quantifies nanoplastics in water. This technique offers superior sensitivity for analyzing nanoplastics, even in complex samples like brewed tea.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Nanoplastics pose a growing environmental concern due to their ubiquity and potential ecological impact.
  • Accurate detection and quantification of nanoplastics are crucial for environmental monitoring and risk assessment.
  • Current analytical methods for nanoplastics often face limitations in sensitivity, speed, or sample preparation.

Purpose of the Study:

  • To introduce and validate a novel photothermal infrared spectroscopy approach for nanoplastic analysis.
  • To demonstrate the capability of nanoelectromechanical systems coupled with Fourier transform infrared spectroscopy (NEMS-FTIR) for rapid and sensitive nanoplastic detection.
  • To assess the performance of NEMS-FTIR for analyzing nanoplastics in complex aqueous matrices, including real-world samples.

Main Methods:

  • Development of a NEMS-FTIR system combining high-sensitivity NEMS with a commercial FTIR spectrometer.
  • Analysis of various nanoplastics (polypropylene, polystyrene, polyvinyl chloride) with sizes ranging from 54 to 262 nm.
  • Quantification of nanoplastics using measured absorptance and attenuation coefficients.

Main Results:

  • NEMS-FTIR achieved limits of detection for nanoplastics between 101 and 353 pg, an order of magnitude lower than pyrolysis-gas chromatography-mass spectrometry.
  • The method successfully identified and quantified different nanoplastic polymers, including mixtures.
  • Nanoplastics released during tea brewing and polyamide leachates from teabags were detected without preconcentration, even in organic matrices.

Conclusions:

  • NEMS-FTIR provides a time-efficient, cryogen-free, and highly sensitive method for routine nanoplastic analysis in aqueous samples.
  • The technique is capable of identifying diverse nanoplastics and their degradation products in complex environmental samples.
  • NEMS-FTIR holds significant potential for environmental monitoring and understanding nanoplastic pollution.