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A highly sensitive dual-readout assay for perfluorinated compounds based CdTe quantum dots.

Fang Zhang1, Jiaman Liang2, Yang Liu3

  • 1Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China; College of Food Science and Engineering, Zhengzhou University of Science and Technology, Zhengzhou 450064, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|December 24, 2021
PubMed
Summary

A new dual-readout strategy using cadmium telluride quantum dots (CdTe QDs) offers sensitive detection of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS). This method provides reliable environmental monitoring for these toxic perfluorinated compounds (PFCs).

Keywords:
CdTe quantum dotsFluorescencePerfluorinated compoundsPicomole quantitiesResonance light scattering

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Area of Science:

  • Environmental Chemistry
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) are prevalent perfluorinated compounds (PFCs) with significant ecological toxicity.
  • Accurate detection of PFCs is crucial for environmental monitoring and risk assessment.

Purpose of the Study:

  • To develop a sensitive and reliable dual-readout detection strategy for PFOA and PFOS.
  • To utilize water-soluble cadmium telluride quantum dots (CdTe QDs) as probes for PFC detection.

Main Methods:

  • A dual-readout strategy combining fluorescence quenching and resonance light scattering (RLS) was employed.
  • CdTe QDs were used as probes, exhibiting fluorescence quenching and forming complexes with PFCs in an acidic medium.
  • Detection limits (LOD) were determined for both PFOA and PFOS using fluorescence and RLS methods.

Main Results:

  • The fluorescence method achieved LODs of 32.02 pM for PFOA and 43.96 pM for PFOS.
  • The RLS method provided LODs of 47.78 pM for PFOA and 56.72 pM for PFOS.
  • Both methods demonstrated linear detection ranges in the low nanomolar to picomole per liter levels, confirming high sensitivity.

Conclusions:

  • The proposed dual-readout strategy using CdTe QDs is a simple, sensitive, and cost-effective method for detecting PFOA and PFOS.
  • This approach enhances measurement reliability and shows potential for practical environmental monitoring applications.