Fabrication of Solid Contact Ion Selective Electrode for Mercury (II) Using Conductive Polymer Membrane

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A solid-contact ion-selective electrode for mercury (II) ions was fabricated to determine Mercury (II) in aqueous environment. A conductive polymer membrane (polypyrrole-PPy) was synthesized electrochemically on paste carbon electrode, which is covered by the ion-selective membrane (ISM) — an important part of a complete solid contact ion selective electrode (SCISE). The electrode showed excellent potentiometric response over a wide concentration range from 10⁻⁹ M to 10⁻² M and detection limit down to 6 × 10⁻¹⁰ M. A good selectivity towards Hg²⁺ ions in comparison with other common ions in water has also been observed. The electrode was employed for determination of Hg²⁺ in ballast water samples with high sensitivity and accuracy.