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<p>Pesticide (glyphosate) monitoring has become a focal point of concern as the unregulated application of pesticides puts both human health and the ecosystem at serious risk. Effective tracking of glyphosate levels is essential to mitigate its adverse effects and ensure the safety of the ecosystem and the human population. This study develops a novel electrochemical (EC) sensor using a nickel-metal organic framework (Ni-MOF) modified electrode to detect ultra-low concentrations of glyphosate pesticide. A one-pot solvothermal approach to synthesize Ni-MOF and a one-step sensor fabrication approach were adopted to modify the electrode surface of an electrochemical sensor. The Ni-MOF material coating on the working electrode surface increases the electrode’s electroactive surface area, promotes electron transport between the electrodes, and demonstrates selectivity and sensitivity towards glyphosate. This electrochemical sensor has a detection limit of 1.9 parts per billion (ppb) or 0.0113&#xa0;nM, over an extensive concentration range of 0.166–0.666&#xa0;µM/L. Further, the proposed sensor exhibits excellent stability and reproducibility with a standard deviation of around 2.8% in relative peak current. It shows excellent selectivity against various interfering substances with approximately ≤ 5% change in the current response. Finally, to showcase its practical applicability, the sensor was assessed by a glyphosate-spiked real sample.</p> Graphical Abstract <p></p>

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Non-enzymatic Electrochemical Sensing of Glyphosate Pesticide Using Nickel-Based Metal–Organic Framework

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • Ravi Patel,
  • Ragini Gupta,
  • Himmat Singh Kushwaha

摘要

Pesticide (glyphosate) monitoring has become a focal point of concern as the unregulated application of pesticides puts both human health and the ecosystem at serious risk. Effective tracking of glyphosate levels is essential to mitigate its adverse effects and ensure the safety of the ecosystem and the human population. This study develops a novel electrochemical (EC) sensor using a nickel-metal organic framework (Ni-MOF) modified electrode to detect ultra-low concentrations of glyphosate pesticide. A one-pot solvothermal approach to synthesize Ni-MOF and a one-step sensor fabrication approach were adopted to modify the electrode surface of an electrochemical sensor. The Ni-MOF material coating on the working electrode surface increases the electrode’s electroactive surface area, promotes electron transport between the electrodes, and demonstrates selectivity and sensitivity towards glyphosate. This electrochemical sensor has a detection limit of 1.9 parts per billion (ppb) or 0.0113 nM, over an extensive concentration range of 0.166–0.666 µM/L. Further, the proposed sensor exhibits excellent stability and reproducibility with a standard deviation of around 2.8% in relative peak current. It shows excellent selectivity against various interfering substances with approximately ≤ 5% change in the current response. Finally, to showcase its practical applicability, the sensor was assessed by a glyphosate-spiked real sample.

Graphical Abstract