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Lead ion selective PVC membrane electrode based on 5,5'-dithiobis-(2-nitrobenzoic acid)
A Rouhollahi1, M Reza Ganjali, M Shamsipur
1Department of Chemistry, Tehran University, Tehran, Iran.
Talanta
|October 31, 2008
Summary
A new PVC membrane electrode using 5,5'-dithiobis-(2-nitrobenzoic acid) effectively detects lead ions (Pb(2+)) with high selectivity and a wide concentration range. This sensor is suitable for direct lead determination in water samples.
Area of Science:
- Electrochemistry
- Analytical Chemistry
- Environmental Science
Background:
- Accurate detection of lead ions (Pb(2+)) is crucial for environmental monitoring and public health.
- Development of selective and sensitive ion-selective electrodes (ISEs) is an active area of research.
Purpose of the Study:
- To prepare and characterize a novel PVC membrane electrode for lead ion detection.
- To evaluate the electrode's performance, including response range, selectivity, and operational stability.
Main Methods:
- Fabrication of a PVC membrane electrode incorporating 5,5 -dithiobis-(2-nitrobenzoic acid) as the ion carrier.
- Potentiometric measurements to assess the electrode's response to lead ions across various concentrations.
- Selectivity testing against common interfering metal ions and pH stability studies.
Main Results:
- The electrode demonstrated a Nernstian response for Pb(2+) over a broad concentration range (1.0x10(-2) to 4.0x10(-6) M).
- It exhibited fast response times and stable potentials for at least three months.
- The electrode showed excellent selectivity for Pb(2+) over other metal ions and operated effectively within a pH range of 2.0-7.0.
Conclusions:
- The developed PVC membrane electrode offers a reliable and selective method for lead ion determination.
- The electrode is suitable for direct lead analysis in real water samples and potentiometric titrations.
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