Electrochemical Sensing of Hydroxylamine in Environmental Samples
Summary
Hydroxylamine is both an intermediate in nitrogen cycling and a pollutant arising from industrial and agricultural processes, with potential toxicity even at low concentrations. Electrochemical sensing offers rapid, sensitive and field-deployable detection through the measurement of oxidation currents generated at a working electrode. Recent advances hinge on the incorporation of nanostructured materials and tailored polymer films to enhance electrocatalytic oxidation, lower overpotentials and suppress interferences in complex matrices such as river water, wastewater and soil extracts. By coupling modified electrodes with voltammetric techniques, researchers have achieved detection limits in the nanomolar range, wide linear dynamic ranges and excellent reproducibility. These developments promise real-time monitoring of hydroxylamine in diverse environmental contexts, supporting regulatory compliance and ecological risk assessment on a global scale.
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Electrochemical Sensing of Hydroxylamine in Environmental Samples publication trend
The graph below shows the total number of articles in electrochemical sensing of hydroxylamine in environmental samples across all publications each year (not limited to Nature Index journals).
Technical terms
Electrochemical sensor: A device that converts a chemical concentration into an electrical signal via redox reactions at an electrode surface.
Screen-printed electrode (SPE): A low-cost, disposable electrode fabricated by printing conductive inks onto a substrate for portable analysis.
Reduced graphene oxide (RGO): A conductive, high-surface-area form of graphene obtained by chemical or thermal reduction of graphene oxide, often used to enhance electron transfer.
Polypyrrole nanotubes: One-dimensional conducting polymer structures offering large surface area and facile charge transport when immobilised on an electrode.
Electrocatalytic oxidation: The acceleration of an oxidation reaction at an electrode surface by a catalyst that lowers the energy barrier and enhances current response.
Differential pulse voltammetry (DPV): A voltammetric technique that applies a series of potential pulses to improve sensitivity and discrimination of overlapping signals.
Cyclic voltammetry (CV): A method in which the electrode potential is swept cyclically to characterise redox behaviour and kinetics of analytes.
Limit of detection (LOD): The lowest concentration of an analyte that can be reliably distinguished from background noise under specified conditions.
Linear dynamic range: The concentration interval over which the measured signal is directly proportional to analyte concentration.
References
- Screen-Printed Electrode Surface Modification with NiCo2O4/RGO Nanocomposite for Hydroxylamine Detection. Nanomaterials (2021).
- A Voltammetric Sensor for the Determination of Hydroxylamine Using a Polypyrrole Nanotubes-Modified Electrode. Applied Sciences (2022).
- Fabrication, characterization and analytical performance of the hydroxylamine sensor based on an oracet blue multi-walled carbon nanotubes film deposited on an electrode surface. Journal of the Brazilian Chemical Society (2012).
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