| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 189795 | Electrochimica Acta | 2011 | 10 Pages |
The construction and performance characteristics of polymeric membrane electrodes based on two newly synthesized macrocyclic ligands 6,7:14,15-Bzo2-10,11-(4-methylbenzene)-[15]-6,8,12,14-tetraene-9,12-N2-1,5-O2 (L1) and 6,7:14,15-Bzo2-10,11-(4-methylbenzene)-[15]-6,14-diene-9,12-dimethylacrylate-9,12-N2-1,5-O2 (L2) for the quantification of Zn2+ ions are described here. Several membranes having different compositions of PVC, plasticizers, ionic additives and ionophores were fabricated and the best response was observed for the membrane having composition L2:PVC:TBP:NaTPB in the ratio of 4:37:57:2 (w/w; mg). The response characteristics of the membrane based on L2 were compared with polymeric membrane electrode (PME) as well as with coated graphite electrode (CGE). The electrode exhibits Nernstian slope for Zn2+ ions with limits of detection of 3.3 × 10−7 mol L−1 for PME and 7.9 × 10−8 mol L−1 for CGE with response time of 12 s and 10 s for PME and CGE respectively. Furthermore, the electrodes generated constant potentials in the pH range of 3.0–8.0 for PME and 2.5–9.0 for CGE. The practical utility of the CGE has been demonstrated by its usage as an indicator electrode in potentiometric titration of EDTA with Zn2+ ion solution. The high selectivity of CGE also permits their use in the determination of Zn2+ ions in water, biological, milk and tea samples.
► Macrocyclic ligands were synthesized and characterized. ► Ligands were used as ionophores in the preparation of PVC based membranes. ► Fabrication of Coated graphite electrode (CGE) and Polymeric membrane electrode (PME) using pendant armed macrocycle. ► CGE showed better response characteristics than PME. ► High selectivity of CGE permits it to determine Zn(II) ion in real samples.
