Abstract
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.
