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

Journal of Chemical Reactivity and Synthesis

دوره 10، شماره 4، اسفند 2020، صفحه 175-185   

نوع مقاله: Research Article

نویسندگان

Shaghayegh Lovineh¹؛ Arezoo Ghaemi^{* 2}

¹Department of Chemistry, khouzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran

²Department of Chemistry, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

چکیده

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. 

کلیدواژه‌ها

Calcium (II) cation؛ Ion selective electrode؛ Potentiometry