Flow Injection Potentiometric Determination of Cd~(2+) Ions Using a Coated Graphite PlasticizedPVC-Membrane Electrode Based on 1,3-bis(2-cyanobenzene)triazene

摘要

1,3-Bis(2-cyanobenzene)triazene, L, was used as a suitable ionophore for the fabrication of a new PVC-based polymeric membrane coated graphite electrode for selective sensing of Cd~(2+) ion. The electrode exhibited a selective linear Nernstian response to Cd~(2+) ion at an optimal pH range of 6-9 with a limit of detection of 8.0 x 10~(-6) M and a fast response time of about 2 s. The electrode was used as a proper detection system in flow-injection potentiometry of cadmium ion and resulted in well defined peaks for cadmium ions with stable baseline, excellent reproducibility and high sampling rates of over 100 injections per hour. It showed good stability, reproducibility and fast response time. The practical utility of the proposed system has also been reported.