Abstract
We developed a novel hydroxylamine sensor through the surface modification of screen-printed electrode (SPE) with NiCo2O4 nanoparticles/reduced graphene oxide (RGO) nanocomposite (NiCo2O4/RGO/SPE). We assessed the electrochemical response of hydroxylamine on the as-fabricated sensor, confirming the high electrocatalytic impact of hydroxylamine oxidation. The electrode produced sensitively responded to hydroxylamine under optimized conditions, with a low limit of detection (2.0 nM) and broad linear dynamic range (0.007–385.0 µM). The presence of NiCo2O4 combined with the modification of RGO resulted in sensitive detection and signal amplification of hydroxylamine oxidation. The proposed sensor was used to determine the existence of hydroxylamine in water samples.
Highlights
Hydroxylamine, HA or NH2 OH, is an ammonium-containing agent that can act as an intermediate in microbial nitrogen cycle processes, generated during anaerobic ammonium oxidation and nitrification
The presence of HA has been recently detected by various techniques, including gas chromatography [4], capillary electrophoresis [5], spectrophotometric [6,7] and chromatography [8,9] analysis, they involve complex processes
The electrochemical measurements were performed by a PGSTAT 302N Autolab potentiostat/galvanostat analyzer
Summary
Hydroxylamine, HA or NH2 OH, is an ammonium-containing agent that can act as an intermediate in microbial nitrogen cycle processes, generated during anaerobic ammonium oxidation and nitrification. The presence of HA has been recently detected by various techniques, including gas chromatography [4], capillary electrophoresis [5], spectrophotometric [6,7] and chromatography [8,9] analysis, they involve complex processes Due to their low cost, operational simplicity, high sensitivity, good selectivity, and fast response, electrochemical techniques have gained attention and have exhibited promising applications for HA analysis [10,11,12,13,14,15]
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