Abstract: Several representative tetraphenylborate salts containing large organic cations were prepared, and the effect of them on the performance of calcium ion-selective microelectrodes based on neutral carrier (ETHlOOl) was systematically studied. The effect of the content of membrane components on the performance of the microelectrode made with sensor containing tetrabutylammonium tetraphenylborate was also evaluated with Latin square method. The optimum membrane composition was obtained.

Key words: Calcium ion-selective microelectrodes, Lipophilic salts, Neutral carrier