Construction of Cu2+-selective electrode and thermodynamic study of the ternary aqueous mixed electrolyte system (CuCl2, KCl, H2O) using nanocomposite-based potentiometric sensor

Document Type : Reasearch Paper

Authors

• Sh. Keyvan ¹
• E. D. Zobairi ¹
• A. Islamnezhad ²

¹ Department of Chemistry, Faculty of Science, Islamic Azad University, Qeshm, Iran.

² Department of Chemistry, Faculty of Science, Islamic Azad University, Rasht, Iran.

10.7508/ijnd.2012.02.004

Abstract

A nanocomposite membrane Cu²⁺ ion-selective electrode has been constructed using a new compound ethyl 1,2,3,4-tetrahydro-4-(4-methoxyphenyl)-6-methyl-2-oxopyrimidine-5-carboxylat (ETMOC) as a neutral ionophore. The electrode works properly. It responds to Cu²⁺ ion with a sensitivity of 29.5 ± 0.2 mV/decade over the range 1.0 × 10⁻⁹ to 5.0 × 10⁻¹M at pH 3.0-8.0. The limit of detection was 4.5 × 10⁻¹⁰ M. It has a response time of < 6s and can be used for at least 3 months without any divergence in potentials. The proposed electrode shows fairly good discrimination of Cu²⁺ ion from several cations. Then, electrolyte solution system, CuCl₂, KCl, H₂O in the concentration range from dilute to near saturate from the thermodynamic viewpoint was investigated. The thermodynamic investigations were performed based on Pitzer ion-interaction model by processing experimental data of potentiometric. The thermodynamic investigations were successfully performed by the evaluation of potentiometric experimental data.

Keywords

• Activity Coefficient
• Pitzer model
• Cu2+-Selective Electrode
• Nanocomposite

20.1001.1.20088868.2012.3.2.4.8

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