Journal
TALANTA
Volume 65, Issue 4, Pages 991-997Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2004.08.032
Keywords
-SCN--selective electrode; PVC-membrane; Rh[(trpy)(bpy)Cl](PF6)(2); potentiometry
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The feasibility of a newly synthesized Rh(III) complex, Rh[(trpy)(bpy)Cl](PF6)(2), as a novel ionophore for the preparation of anion-selective polymeric membrane electrodes was tested. The ionophore exhibited anti-Hofmeister behavior with enhanced potentionietric 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 +/- 0.5 mV per decade and a detection limit of 4.0 x 10(-6) M (0.23 ppm). It could be used in a pH range of 3.0-8.0 and has a fast response time of about 15 s. 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. (C) 2004 EIsevier B.V. All rights reserved.
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