Sh Lovineh - Department of Chemistry, khouzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran- Department of chemistry, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

In this project, a highly selective calcium coated graphite electrode was prepared by benzo-18-crown-6 as an ionophore into plasticized polyvinylchloride (PVC) membrane. The best response characteristic was observed using the membrane composition of dioctyl phthalate (DOP) = 63.0 mg, PVC = 30.0 mg, sodiumtetraphenylborate (NaTPB) = 3.0 mg and benzo-18-crown-6 = 4.0 mg. The electrode has a fast response time of 10 s, with a satisfactory reproducibility and relatively long life time of 28 days without significant drift in potential. This electrode reveals a very good selectivity toward Ca2+ ion over a wide range of alkali, transition and heavy metal cations.

Calcium (II) cation, Ion selective electrode, Potentiometry