In this work, reduced graphene oxide/double-walled carbon nanotubes/octahedral-Fe3O4/chitosan composite material modified screen-printed gold electrodes (rGO/DWCNTs/Oct-Fe3O4/Cs/SPAuE) under inhibition of urease enzyme was developed for the determination of glyphosate (GLY). The electrochemical behaviors of GLY on these electrodes were evaluated by square wave voltammetry (SWV). With the electroactive surface area is 1.7 times higher than that of bare SPAuE, the rGO/DWCNTs/Oct-Fe3O4/Cs/SPAuE for detection of GLY shows a low detection limit (LOD) of ~ 0.08 ppb in a large concentration range of 0.1–1000 ppb. Moreover, it is also successfully applied to the determination of GLY in river water samples with recoveries and relative standard deviations (RSDs) from 98.7% to 106.9% and from 0.79% to 0.87%, respectively. The developed composite will probably provide an universal electrochemical sensing platform that is very promising for environmental monitoring.
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This research is funded by Institute of Materials Science (IMS) under Grant Number CS.06/20-21 and supported by JSPS KAKENHI Grant Number JP17H03404 for Basic Research: Category B.
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Thanh, C.T., Binh, N.H., Duoc, P.N.D. et al. Electrochemical Sensor Based on Reduced Graphene Oxide/Double-Walled Carbon Nanotubes/Octahedral Fe3O4/Chitosan Composite for Glyphosate Detection. Bull Environ Contam Toxicol 106, 1017–1023 (2021). https://doi.org/10.1007/s00128-021-03179-7
- Electrochemical sensor
- Reduced graphene oxide
- Double-walled carbon nanotube
- Octahedral Fe3O4