Electrochemical Detection of Herbicide Contaminants

Herbicide contaminants such as paraquat and diquat pose persistent threats to environmental and human health through soil leaching, waterway pollution and food-chain accumulation. Electrochemical detection harnesses redox reactions at electrode interfaces to convert trace concentrations of these quaternary ammonium compounds into measurable electrical signals. Key strategies involve the modification of conventional electrodes with nanostructured materials—such as metal–organic frameworks (MOFs), metal nanoparticles and carbon nanocomposites—to amplify electron transfer, enhance surface area and impart molecular recognition. Detection modes typically include cyclic voltammetry, differential pulse voltammetry and square-wave voltammetry, each offering rapid analysis, low limits of detection and compatibility with portable instrumentation. Recent advances have focused on integrating selective biorecognition elements, notably aptamers, with high-conductivity substrates to secure both sensitivity and specificity in complex matrices. Paper-based and inkjet-printed platforms have further driven the miniaturisation of disposable sensors for on-site water, food and clinical testing. Collectively, these developments underscore a trajectory towards real-time monitoring networks capable of safeguarding public health and informing regulatory frameworks across diverse agroecosystems.

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Electrochemical Detection of Herbicide Contaminants publication trend

The graph below shows the total number of articles in electrochemical detection of herbicide contaminants across all publications each year (not limited to Nature Index journals).

Technical terms

Metal–organic framework (MOF): A porous hybrid material assembled from metal nodes and organic linkers, used to increase electrode surface area and facilitate analyte preconcentration.

Aptamer: A short strand of nucleic acid that binds selectively to a target molecule, employed to confer high specificity in electrochemical sensors.

Differential pulse voltammetry: An electroanalytical technique applying a series of potential pulses to enhance sensitivity for trace analyte detection.

Square-wave voltammetry: A pulsed voltammetric method offering rapid scanning and low detection limits by superimposing square-wave modulations onto a staircase potential.

Limit of detection (LOD): The lowest concentration of an analyte that produces a signal distinguishable from the background noise, often defined at a specific signal-to-noise ratio.

References

1. Hematite nanoparticle decorated MIL-100 for the highly selective and sensitive electrochemical detection of trace-level paraquat in milk and honey. Sensors and Actuators B Chemical (2023).
2. A Label-Free Electrochemical Aptasensor Based on Zn/Fe Bimetallic MOF Derived Nanoporous Carbon for Ultra-Sensitive and Selective Determination of Paraquat in Vegetables. Foods (2022).
3. Silver Inkjet-Printed Electrode on Paper for Electrochemical Sensing of Paraquat. Chemosensors (2021).