A simple, cost–effective electrode surface modified with a mixture of laponite clay and zirconium oxide (laponite–ZrO2) gel nanocomposites has been developed for the detection of parathion-ethyl pesticide. Different composition ratios of laponite–ZrO2 gel were used to modify the surface of glassy carbon (GC) electrode. The fabricated electrode was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, and attenuated total internal reflectance infrared spectroscopy. Cyclic voltammetry and differential pulse voltammetry were employed to investigate the modified laponite–ZrO2 electrode toward the electrochemical oxidation of several organophosphate compounds. The obtained results showed that the laponite–ZrO2 nanocomposites-modified GC electrodes have improved the sensitivity and selectivity of parathion-ethyl detection with a limit of detection as low as 1.6 ng mL−1 in the linear range of 0–58.3 ng mL−1 (R2 = 0.994). Furthermore, the modified electrodes showed good stability at 71.6 ± 3.2 % after 14 days with the relative standard deviation of 4.36 % (n = 20).
Bibliographical noteFunding Information:
This work was supported by a grant from the Department of Defense, Grant No. W911NF-11-1-0181 at Albany State University.
© 2015, Springer Science+Business Media Dordrecht.
- Differential pulse voltammetry
- Laponite clay
- Organophosphate compounds
- Zirconium oxide