Electrochemical Sensor Based On Carbon Printed Electrode

An amperometric method for the determination of nitrite ions has been developed using disposable, Carbon printed electrodes in presence of potassium ferrocyanide (II) as a mediator. The used sensors have a gold working electrodes with an area of about 7 mm2. Calibration curves exhibit a linear relationship between the electrode response and the nitrite concentration up to 2.50 mM. with correlation coefficients equal to or better than 0.983. The lowest nitrite concentration measured (LOQ) was 100 M. The relative standard deviations were equal to or better than 6.73 % (n=5). The electrode response was examined with respect to different parameters. The sensors were evaluated on samples of unspiked and spiked tap water and agriculture drain water.