Square Wave Voltammetric Determination of Nitrate at a Freshly Copper Plated Glassy Carbon Electrode

Abstract

Abstract The determination of nitrate by square wave voltammetric method with a freshly copper plated glassy carbon electrode was described. A reduction peak for the nitrate ions on this electrode was observed at about −0.82 V vs Ag|AgCl|KClsatd in a solution of 2.0 × 10−2 M Cu2+, 0.5 M H2SO4, and 1.0 × 10−3 M KCl. This reduction peak was exploited for the determination of nitrate in various drinking water samples. The working linear range was established by regression analysis as 6.17 × 10−7 M and 5.0 × 10−5 M. The method was applied for the determination of nitrate in Ankara drinking waters. This result was compared with both reference method and previous method results by statistically. It was shown that the difference between the results were insignificant. Limit of detection (LOD) and limit of quantitation (LOQ), coefficient of variation, correlation coefficient (R) and residual standard deviation, and standard deviation of the method were calculated for nitrate calibration graph.