A new approach for in situ electrodeposition of a renewable copper layer onto a copper electrode is reported. The active surface was obtained
by anodic dissolution of a copper electrode at an appropriate potential and further redeposition of copper ions still remaining at the diffusion layer.
Under optimal experimental conditions the peak current response increases linearly with nitrate concentration over a range of 0.1–2.5 mmol L−1.
The repeatability of measurements for nitrate was evaluated as 1.8% (N= 15) and the limit of detection of the method was found to be 11mol L−1
(S/N = 3). Nitrate contents in two different samples (mineral water and sausages) compared well with those obtained from using the standard Griess
protocol at a 95% of confidence level measured by the t-student test. The interference from chloride on the nitrate analysis and the possibility of
simultaneous determination of nitrite were also examined.
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