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Updated: Jun 28, 2026

A Dual-Functional Electroactive Filter Towards Simultaneously Sb(III) Oxidation and Sequestration
Published on: December 5, 2019
The first use of a Rh(III) complex as a novel ionophore for thiocyanate-selective polymeric membrane electrodes
Mojtaba Shamsipur1, Sohrab Ershad, Naser Samadi
1Department of Chemistry, Razi University, Kermanshah, Iran.
Abstract:
The feasibility of a newly synthesized Rh(III) complex, Rh[(trpy)(bpy)Cl](PF(6))(2), as a novel ionophore for the preparation of anion-selective polymeric membrane electrodes was tested. The ionophore exhibited anti-Hofmeister behavior with enhanced potentiometric selectivity toward thiocyanate ion compared to other anions. The influence of some experimental parameters such as membrane composition, nature and amount of plasticizer and additive and concentration of internal solution on the potential response of the SCN(-) sensor were investigated. The electrode exhibits a Nernstian response for SCN(-) over a wide concentration range (1.0 x 10(-5) to 1.0 x 10(-1)M) with a slope -58.7 +/- 0.5mV per decade and a detection limit of 4.0 x 10(-6)M (0.23ppm). It could be used in a pH range of 3.0-8.0 and has a fast response time of about 15s. The proposed sensor was used for the determination of thiocyanate ions in real samples such as urine and saliva of smokers and nonsmokers and, as an indicator electrode, in potentiometric titrations of SCN(-) ion.
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