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A specific visual-volumetric sensor for mercury ions based on smart hydrogel.

Shenghai Zhang1, Wenzhong Qu1, Simeng Chen1

  • 1School of Chemistry and Chemical Engineering, Ankang University, Quality Supervision and Inspection Centre of Se-enriched Food of Shaanxi Province, Shaanxi University Innovation Research Institute of Advanced Energy Storage Materials and Battery Technology for Future Industrialization, Ankang Research Centre of New Nano-materials Science and Technology Research Centre, Ankang, Shaanxi Province, 725000, P. R. China. zhshai512@163.com.

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Summary

Researchers developed a novel visual-volumetric sensor for mercury ion (Hg2+) detection. This simple, portable hydrogel sensor allows naked-eye, quantitative measurement of mercury ions in solution without complex equipment.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Environmental Science

Background:

  • Mercury ions (Hg2+) pose significant environmental and health risks.
  • Accurate and accessible detection methods for Hg2+ are crucial for monitoring and remediation.
  • Existing methods often require sophisticated instrumentation and trained personnel.

Purpose of the Study:

  • To design and synthesize an innovative visual-volumetric sensor for the quantitative detection of mercury ions (Hg2+).
  • To develop a low-cost, portable, and instrument-free method for on-site Hg2+ determination.
  • To explore the potential of functionalized hydrogels as smart materials for analyte sensing.

Main Methods:

  • Functionalization of polyacrylamide hydrogel with fluorescein and uracil.
  • Design of a visual-volumetric sensing platform based on Hg2+ coordination chemistry.
  • Development of a method for naked-eye, graduation-based quantitative detection of Hg2+.

Main Results:

  • The sensor achieved quantitative detection of Hg2+ at the μM level with a detection limit of 2.8 × 10^-7 mol L^-1.
  • A wide linear response range for Hg2+ was observed (1.0 × 10^-6–5.0 × 10^-5 mol L^-1).
  • The sensor demonstrated high selectivity, rapid response (∼30 min), good repeatability (RSD < 5%), and portability.

Conclusions:

  • The developed visual-volumetric sensor offers a simple, low-cost, and portable solution for on-site Hg2+ determination.
  • The sensor's design principles and fabrication methods provide a new avenue for creating smart materials and visual-volumetric sensors for various analytes.
  • This approach facilitates accessible environmental monitoring and potential applications in public health surveillance.