Tb³⁺ PVC-Membrane Electrode Based on 2-{2-(2-Anilinocarbothioyl)hydrazino)-2-oxoacetyl}-N-phenyl-1-hydrazine Carbothioamide

Abstract

The polyvinyl chloride (PVC) membrane containing 2-{2-(2-anilinocarbothioyl)hydrazino)-2-oxoacetyl}-N-phenyl-1-hydrazinecarbothioamide (AHC) as a suitable iophore exhibits a Nernstian response for Tb³⁺ ions over a wide concentration range (1.0 × 10⁻⁶ to 1.0 × 10⁻² M) with a slope of 19.6 ± 0.3 mV per decade and a limit of detection of 6.8 × 10⁻⁷ M in the pH range 3.5–8.5. The proposed sensor revealed very good selectivities (expect for the Pr³⁺ and Ho³⁺ ions) for a wide variety of other metal ions. The practical utility of the electrodes has been demonstrated by its use for the determination of Tb³⁺ in different solutions.

Keywords:

• Ion-selective electrode
• potentiometry
• PVC membrane
• sensor

The authors gratefully acknowledge the financial support of this research proposal provided by the Research Council of the Quchan Islamic Azad University.

Notes

^a Results are based on three measurements.