Synthesis of Calcium-Zincon Complex and Exploitation it in the Assembly of Calcium Ion-Selective Electrode

A new calcium ion-selective electrode was assembled from complex synthesized by calcium ion and zincon which doped in pvc with suitable mediator and solvent . the prepared complex was identified by uv- visible and ir spectrophotometry. the new electrode was characterized by its high slope (29.55 ±0.02 mv/decade) compared with calcium phosphate electrode (26.67±0.022 mv/decade) and long lifetime (10 months) . the linear range of the electrode was 10-5- 10-1m and the detaction limit was 10-5m . response time was in the range of 20-60 seconds depending on the concentration of the solution and the lifetime of the electrode. the electrode was linearlyworking at a ph of (5-10). most of anions were severely interfered and these were exploited to determine calcium and the anions in precipitation titrations . cations were slightly interfered especially at high interferent concentrations . the new electrode was applied for the determination of calcium in tap water which offered excellent results compared with flame emission photometric method .