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Matrix Overloading Effects on Size-Resolved Quantification of Low-Concentration Nanoplastics in Complex Environmental

Yu Wang1, Xike Tian1, Liqiang Lu1

  • 1Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.

Analytical Chemistry
|November 3, 2025
PubMed
Summary
This summary is machine-generated.

Accurate nanoplastic quantification in water is challenging due to low concentrations. Asymmetric flow field-flow fractionation (AF4) shows promise, but matrix effects like dissolved organic matter can hinder detection limits for environmental nanoplastics.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Accurate size-resolved quantification of nanoplastics in natural waters is crucial for understanding their environmental impact and toxicity.
  • Existing methods are challenged by the ultralow concentrations of nanoplastics in environmental samples.
  • Analytical artifacts in nanoplastic quantification methods require thorough investigation.

Purpose of the Study:

  • To develop and validate a size-resolved quantification method for nanoplastics (20-200 nm) in environmentally relevant conditions using AF4-UV.
  • To explore analytical artifacts, particularly matrix effects, impacting nanoplastic quantification.
  • To establish reliable detection limits for nanoplastics in various water matrices.

Main Methods:

  • Utilized asymmetric flow field-flow fractionation coupled with UV detection (AF4-UV) for on-channel preconcentration and separation.
  • Employed polystyrene beads of varying sizes for method calibration and assessment of particle-dependent responses.
  • Investigated the impact of environmental matrices, including dissolved organic matter and suspended particles, on quantification accuracy and detection limits.

Main Results:

  • Achieved strong linear correlations between nanoplastic concentration and AF4-UV peak area, though calibration slopes varied with particle type due to differing UV absorption.
  • Established low limits of detection (LODs) of approximately 17 ng in pristine water.
  • Demonstrated significant elevation of LODs in complex matrices (e.g., bottled water, river water) due to matrix overloading, increasing LODs to 25-45 ng.

Conclusions:

  • AF4-UV is a viable technique for size-resolved nanoplastic quantification, but particle-specific calibration is necessary.
  • Matrix components severely impact quantification by causing overloading, increasing detection thresholds, and reducing recovery rates.
  • Future advancements in channel design are needed to enhance particle loading capacity, mitigate matrix effects, and improve the sensitivity for ultralow nanoplastic monitoring.