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A Printed Paper-Based Anion Sensor Array for Multi-Analyte Classification: On-Site Quantification of Glyphosate.

Zhoujie Zhang1, Vahid Hamedpour1, Xiaojun Lyu1

  • 1Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, 153-8505, Meguro-ku, Tokyo, Japan.

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|March 31, 2021
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Summary

A new paper-based chemosensor array device (PCSAD) enables accurate detection of harmful oxyanions, including the herbicide glyphosate (GlyP), in water. This sensor is crucial for environmental monitoring and public health protection.

Keywords:
anionschemosensor arraysherbicidesimage processingpaper

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Accurate detection of oxyanions in aqueous media is critical for environmental assessment and public health.
  • Existing methods for oxyanion detection can be complex and require specialized equipment.
  • Development of portable and cost-effective sensor devices is needed for on-site analysis.

Purpose of the Study:

  • To develop and validate a paper-based chemosensor array device (PCSAD) for the quantitative detection of oxyanions.
  • To specifically target the herbicide glyphosate (GlyP) in aqueous samples.
  • To establish a reliable method for on-site environmental monitoring.

Main Methods:

  • Utilized a coordination-binding-based sensor array mechanism involving Zn2+ and catechol dyes.
  • Induced colorimetric changes upon competitive binding with seven different oxyanions.
  • Employed an automated image-processing algorithm with pattern recognition for qualitative and quantitative analysis.
  • Applied linear discrimination analysis for differentiating similar oxyanions and regression analysis for quantification.

Main Results:

  • Achieved 100% accuracy in discerning similarly structured oxyanions using linear discrimination analysis.
  • Quantified glyphosate (GlyP) with a limit of detection of 16.5 mg/L, below the EPA's health advisory value for children.
  • Demonstrated the capability of PCSAD for accurate on-site quantification of aqueous anions.

Conclusions:

  • The paper-based chemosensor array device (PCSAD) is a powerful tool for the on-site quantification of aqueous anions.
  • PCSAD offers a sensitive and accurate method for detecting harmful contaminants like glyphosate in environmental samples.
  • This technology has significant potential for environmental assessment and safeguarding public health.