An original nitrate sensor based on silver nanoparticles electrodeposited on a gold electrode

Abstract The electroreduction of nitrate in synthetic seawater was investigated by cyclic voltammetry (CV) at a bare gold electrode modified by electrodeposited silver nanoparticles (AgNPs). The AgNPs were generated by chronoamperometry using a charge, Q, lower than the theoretical one corresponding to a silver monolayer. In these conditions, a linear range for nitrate determination is obtained from 10·10 -6  mol L -1 to 10·10 -3  mol L -1 . Such a low limit of detection was achieved due to the combination of two chemical reactions coupled with electron transfer.

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