Rapid Measuring of Cu2+ ions by Selective Potentiometric Sensor based on a New Ion Carrier

In this paper, 2-(4-methyl pyperazine-1-yl methyl)-1-cyano cyclohexanone was synthesized and used as an ion carrier in Cu2+ ion selective sensor. The potentiometric sensor was worked well in a concentration range of 1.0×10-2 to 1.0×10-6 M of Cu2+ ions with Nernstian slope of 30.7±0.6 mV/decade. Workable pH range of the sensor was 3.5-8.5 and the response time of the electrode was about 10 s. Detection limit of the electrode was obtained 1.0×10-6 M. The sensor has a relatively fast response time (∼10 s) and a useful working pH range of 3.5-8.5. The proposed electrode responded to copper ions selectively respect to other common metal cations. Performance of the copper electrode as an indicator electrode was checked in a potentiometric titration of Cu2+ ions with EDTA as titrant which confirmed the monitoring ability of the copper selective sensor. Finally, direct determination of Cu2+ ions in some river water samples was done to show the analytical ability of the designed sensor.