Preparation of a double-step modified carbon paste electrode for the voltammetric determination of Propham (cas 122-42-9) via bulk modification with fumed silica and drop-casting of maghemite-modified fumed silica nanocomposite

Add time:09/06/2019    Source:sciencedirect.com

In this study, a double-step modified carbon paste electrode (CPE) was prepared for the voltammetric determination of Propham (cas 122-42-9) (PRO). In the first step, modification of CPE was performed by incorporating 12.5% fumed silica (FS) into paste structure to obtain CPE-12.5FS. In the second step, CPE-12.5FS electrode was modified with drop-casting of maghemite-modified FS ([email protected]) dispersion to prepare CPE-12.5FS/[email protected] The proposed modification process combined the advantages of both bulk modification and drop-casting techniques and showed synergistic effect on the voltammetric behaviour of the electrode. The electrode was characterized with cyclic voltammetry and electrochemical impedance spectroscopy. Scanning electron microscopy and X-ray diffraction analysis were used in the characterization of [email protected] Electrode preparation and measurement conditions were optimized. The highest peak current for the oxidation of PRO was obtained at pH 6. PRO showed an irreversible oxidation on CPE-12.5FS/[email protected] A linear relationship was obtained between oxidation peak current and PRO concentration in the range of 0.01 μM and 5.0 μM. The limit of detection value was calculated to be 4.4 nM. Measurement and fabrication reproducibility of the modified electrode was obtained as 2.95% (N: 9) and 4.80% (N: 6), respectively. The CPE-12.5FS/[email protected] allowed determining PRO in the presence of the carbamate pesticides of carbofuran and carbaryl. The determination of PRO in real samples such as potato, urine and river water was successfully tested with CPE-12.5FS/[email protected] The results showed that the electrochemical sensor could be a very promising alternative to other methods of determining PRO.

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