Calcium measurement using ion selective electrode based on a benzo-18-crown-6 as an ionophore

Subject Areas :

Shaghayegh 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

Received: 2022-01-31 Accepted : 2022-01-31 Published : 2020-12-01

Keywords: Potentiometry, Ion selective electrode, Calcium (II) cation,

Abstract :

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.