Ultra-sensitive glyphosate detection in soil and wastewater using Zn-zeolitic imidazolate framework-67/montmorillonite nanocomposite electrochemical sensor
Mona Elfiky, Amr M. Beltagi, Marwa M. Bediwy
TL;DR
A new electrochemical sensor detects glyphosate at very low levels in soil and wastewater, helping protect the environment.
Contribution
A Zn-ZIF-67/montmorillonite nanocomposite sensor with ultra-low detection limits for glyphosate is developed.
Findings
The sensor achieved a detection limit as low as 0.009 nM in bulk solutions.
It detected glyphosate in spiked soil samples with a detection limit of 0.015 nM.
The nanocomposite provided high conductivity and a large electroactive surface area.
Abstract
A novel electrochemical sensor for the determination of glyphosate (GLY) has been developed. It is based on a nanocomposite of zinc-based zeolitic imidazolate framework-67 and exfoliated montmorillonite (Zn-ZIF-67/Exf. MMt). The composite was synthesized by a hydrothermal method and characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and surface area analysis (BET). Incorporated into a modified graphite paste sensor (MGPS), the material provided high conductivity, large electroactive surface area (0.68 cm2), and low resistivity (75.0 Ω). Using square wave adsorptive cathodic stripping voltammetry (SW-AdCSV), the optimized sensor, containing 1.0% (Zn-ZIF-67/0.5 Exf. MMt) modified graphite paste sensor (MGPS), showed excellent electrochemical performance with a high electroactive surface area (0.68…
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Taxonomy
TopicsPesticide and Herbicide Environmental Studies · Electrochemical sensors and biosensors · Polymer-Based Agricultural Enhancements