Analytical Sciences

Abstract − Analytical Sciences, 17(9), 1049 (2001).

Cobalt(II)-Selective Membrane Electrode Based on a Recently Synthesized Benzo-Substituted Macrocyclic Diamide
Mojtaba SHAMSIPUR,* Tahereh POURSABERI,** Shohre ROUHANI,** Khodabakhsh NIKNAM,*** Hashem SHARGHI,*** and Mohammad Reza GANJALI** 
*Department of Chemistry, Razi University, Kermanshah, Iran
**Department of Chemistry, Tehran University, Tehran, Iran
***Department of Chemistry, Shiraz University, Shiraz, Iran
A PVC-membrane electrode based on a recently synthesized 18-membered macrocyclic diamide is presented. The electrode reveals a Nernstian potentiometric response for Co2+ over a wide concentration range (2.0 x 10-6 - 1.0 x 10-2 M). The electrode has a response time of about 10 s and can be used for at least 2 months without any divergence. The proposed sensor revealed very good selectivities for Co2+ over a wide variety of other metal ions, and could be used over a wide pH range (3.0 - 8.0). The detection limit of the sensor is 6.0 x 10-7 M. It was successfully applied to the direct determination and potentiometric titration of cobalt ion.