Mercury(II) ion-selective polymeric membrane sensor based on a recently synthesized Schiff base
Mohammad Hossein Mashhadizadeh1, Iran Sheikhshoaie
1Department of Chemistry, Shahid Bahonar University of Kerman, P.O. Box 133, Kerman 76169, Iran.
Talanta
|October 31, 2008
Summary
Researchers developed a new polyvinyl chloride (PVC) sensor highly selective for mercury (Hg(II)) ions. This selective sensor offers rapid and stable detection of mercury in aqueous solutions.
Area of Science:
- Analytical Chemistry
- Electrochemistry
- Materials Science
Background:
- Mercury ions (Hg(II)) pose significant environmental and health risks.
- Accurate and selective detection methods for mercury are crucial for environmental monitoring and safety.
- Existing methods for mercury detection can be complex or lack selectivity.
Purpose of the Study:
- To develop a novel polyvinyl chloride (PVC) membrane electrode for highly selective Hg(II) ion detection.
- To evaluate the performance characteristics of the proposed sensor, including its response range, selectivity, and stability.
- To demonstrate the practical applicability of the sensor in direct mercury determination and potentiometric titrations.
Main Methods:
- Synthesis of bis[5-((4-nitrophenyl)azo salicylaldehyde)] (BNAS) as a neutral carrier for the PVC membrane.
- Fabrication and electrochemical characterization of the PVC membrane electrode.
- Testing the sensor's Nernstian response, selectivity against interfering ions, response time, operational pH range, and long-term stability.
- Application of the electrode for direct determination of Hg(II) in aqueous solutions and as an indicator electrode.
Main Results:
- The developed PVC membrane electrode exhibited high selectivity for Hg(II) ions.
- A wide Nernstian response was observed for Hg(II) over a concentration range of 5.0x10(-2) to 7.0x10(-7) M, with a slope of 30±1 mV/decade.
- The sensor demonstrated a fast response time (<10 s), operational stability for over 3 months, and usability within a pH range of 1.0 to 3.5.
- The electrode showed good discrimination against common metal ions and was successfully applied in direct mercury determination and potentiometric titrations.
Conclusions:
- A novel and highly selective PVC membrane electrode based on BNAS neutral carrier was successfully developed for Hg(II) ion detection.
- The sensor offers excellent performance characteristics, including a wide linear range, fast response, and good stability, making it suitable for practical applications.
- This new electrode provides a reliable and efficient tool for the direct determination of mercury ions in aqueous samples and potentiometric analysis.
