Construction of Modified Solid-State Screen-Printed and Carbon Rod Electrodes for Determination of Thallium (III) Ions by Potentiometric Sensor

Document Type : Original Article

Author

Assistant Professor, Department of Chemistry, Technical and Vocational University, Tehran, Iran.

Abstract

This research study was focused on development of novel potentiometric sensor for the determination of thallium (III) ions in water solutions. Ion-selective electrodes based on screen-printed graphite electrode and carbon rod electrode described and modified solid-state screen-printed and carbon rod electrodes with thallium (III)-imprinted polymer as ionopher. The ion-selective electrode was prepared by dispersing the thallium (III)-imprinted polymer particles in 2-nitrophenyloctylether as a plasticizer and then embedding them in a polyvinylchloride polymeric matrix. The Tl (III)-ion selective electrode showed a Nernstian response for thallium (III) ions over the dynamic concentration range of 0.49 to 20.5 µM, with a slope of 19.6 mV per decade. One of the significant points was the selectivity coefficient of the prepared ion-selective electrode. The selectivity of this electrode for other ions was less than 1.1× 10-3 and this indicates the selectivity of the electrode to thallium (III) ions and other ions was less disturbing.

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Main Subjects


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