Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10561512 | Talanta | 2005 | 7 Pages |
Abstract
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 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 SCNâ sensor were investigated. The electrode exhibits a Nernstian response for SCNâ over a wide concentration range (1.0 à 10â5 to 1.0 à 10â1 M) with a slope â58.7 ± 0.5 mV per decade and a detection limit of 4.0 à 10â6 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 SCNâ ion.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Mojtaba Shamsipur, Sohrab Ershad, Naser Samadi, Ali Reza Rezvani, Hasan Haddadzadeh,