A New Potentiometric Sensor Based on Carbon Paste Electrode Modified with Methacrylic Acid Based-Ion Imprinted Polymer for Nickel Ion Determination

Alizadeh, Taher; Rashedi, Maryam; Ghadiri, Amir Mohammad

doi:10.22034/abec.2023.708675

A New Potentiometric Sensor Based on Carbon Paste Electrode Modified with Methacrylic Acid Based-Ion Imprinted Polymer for Nickel Ion Determination

Document Type : Original Article

Authors

Taher Alizadeh

Maryam Rashedi

Amir Mohammad Ghadiri

Department of Analytical Chemistry, Faculty of Chemistry, University College of Science, University of Tehran, Tehran, Iran P.O. Box 14155-6455, Tehran, Iran

10.22034/abec.2023.708675

Abstract

A novel ion-imprinted polymer (IIP)-based potentiometric sensor is introduced for precise determination of Ni²⁺ ions. The imprinted polymer was prepared using methacrylic acid and ethylene glycol dimethacrylate as functional monomer and cross-linker. This potentiometric sensor is a carbon paste electrode, composed of IIP particles (4%), graphite (64%), n-eicosane (25%), and sodium tetra phenyl borate (5%) in its optimum condition. The sensor exhibited a Nernstian slope of 29.1±0.4 mVdecade⁻¹ in the concentration range of 1.0×10⁻⁶ to 1.0×10⁻¹ mol L⁻¹ with a detection limit of 5×10⁻⁷mol L⁻¹. The sensor demonstrated a stable potential response in the pH range of 4–7 and fast response times below 1 minute. Thanks to the high selectivity of the IIP-based probe, common interfering species had almost no effect on its response toward Ni²⁺ ions. The proposed sensor was prosperously applied to analyze the Ni²⁺ content of real sea, lake, and industrial water samples.

Keywords

Carbon paste

Ion imprinted polymer

Potentiometry

Nickel ion

Methacrylic acid

Subjects