The preparation of Ca2+–selective electrodes

Abstract

Ion selective electrode (ISE) is a useful tool in the direct determination of ionic species in complex samples. This study relates to the manufacture of Ca2+– selective electrode with single – barrelled microelectrodes and an internal filling solution buffered for pCa (pCa= –lg[Ca2+]) of 6. It is shown that an improved lower detection limit of 10–6 M is obtained in Ca2+ buffer solution and the changes in EMF (Electromotive force) between two solutions of 10 – fold change in Ca2+ concentration are close to 30 mV/decade.

Keywords

• Cocktail A
• EGTA
• EMF
• ISE
• microelectrodes
• SICM