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Readily Visualized Perfluorooctanoic Acid Detection Using a Small Molecule Chemosensor.

Yu-Dong Yang1, Qian Zhang1, Xingchen Jin1

  • 1Department of Chemistry, The University of Texas at Austin, 1105 East 24th Street, Stop A5300, Austin, TX, 78712-1224, USA.

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Summary
This summary is machine-generated.

A new sensor detects per- and poly-fluoroalkyl substances (PFAS) in water with high sensitivity. This "turn-on" fluorescent sensor offers rapid, visual detection of these harmful contaminants, aiding environmental monitoring efforts.

Keywords:
DipyrrolylpyridinesFluorescence spectroscopyHost–guest systemsPFASSensors

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Growing concerns about per- and poly-fluoroalkyl substances (PFAS) impact human health.
  • Accurate detection of trace-level PFAS in water is crucial for environmental safety.

Purpose of the Study:

  • To develop a novel small molecule sensor for sensitive PFAS detection.
  • To enable rapid and visual identification of PFAS in aqueous environments.

Main Methods:

  • Synthesis of 2,6-bis(3,5-diethyl-1H-pyrrol-2-yl)pyridine (receptor 1).
  • Utilizing liquid-phase extraction (LPE) for sample preparation.
  • Employing "turn-on" fluorescence emission spectroscopy for detection.
  • Validation using UV-vis, fluorescence, NMR, DFT, and X-ray diffraction.

Main Results:

  • Receptor 1 exhibits high binding affinity for long-chain PFAS (logKa = 4.9-6.2).
  • Achieved limits of detection (LOD) as low as 250 ppt by naked eye and 40 ppt with smartphone analysis.
  • Demonstrated rapid response (<10 min for PFOA) and minimal interference from other species.

Conclusions:

  • The developed sensor provides a sensitive and rapid method for detecting PFAS in water.
  • The sensor's portability and ease of use facilitate on-site environmental monitoring.
  • This approach offers a promising tool for addressing PFAS contamination concerns.