Calcium measurement using ion selective electrode based on a benzo-18-crown-6 as an ionophore
الموضوعات : International Journal of Heterocyclic ChemistryShaghayegh Lovineh 1 , Arezoo Ghaemi 2
1 - Department of Chemistry, khouzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran
2 - Department of Chemistry, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
الکلمات المفتاحية: Potentiometry, Ion selective electrode, Calcium (II) cation,
ملخص المقالة :
A new PVC based membrane using benzo-18-crown-6 as an ionophore has been developed as a calcium ion selective electrode. The electrode comprises of ionophore (4%), PVC (30%) and plasticizer (63%). The electrode shows a linear dynamic response in the concentration range of 1×10−5 M to 1×10−1 M with a Nernstian slope of 29.8 mV/decade and detection limit is 4.0×10−6 M. The proposed sensor shows reasonably good selectivity with respect to alkali, alkaline earth and transition metal ions. It can be used in the pH range of 5 to 12. The proposed electrode also was applied for the direct determination of Ca2+ cation in doubly distilled deionized water samples spiked with different concentrations of calcium. This electrode was also used for determination of Ca2+ in real samples with a very good recovery.
