Electrochemical Detection and Removal of Mercury (II) at DNA Modified Carbon Paste Electrode

Abstract

Herein, we report a simple and inexpensive way for the fabrication of a microelectrode, DNA modified carbon paste electrode (DNA-CPE). DNA is deposited onto carbon paste electrode surface by self-assembled monolayers. The electrochemical behaviour of DNA-CPE's was studied by cyclic voltammetry (SWV) tests. The recorded CV's showed two redox peacks simultaneously at E oxidation=0.3 V and E reduction=0.2 V. The recorded SWV curves at DNA-CPE have shown great efficiency in the analysis of mercury (II) at different concentrations.

Nickel-Modified Carbon Paste Electrode for the Methanol Fuel Cell

“…The Ni-CPE modified electrode was prepared by manually mixing the nickel compound and the graphite powder by adding paraffin oil at different Ni/CP ratios of 5, 10, 25, 40, 50, 65 and 80% by weight (w/w) to give appropriate ratios (w/w). Ethanol was added to the mixture in a suitable amount as an inert volatile solvent and the resulting mixture was well homogenized by thoroughly mixing the two materials, then this mixture was left in the air for evaporation of the solvent [13]. The composite material obtained (paste) was housed in a cylindrical PTFE tube (the geometric surface of the working electrode is 0.1256cm2).…”

Electrochemical Detection of Lead Ions by 2-Benzimidazolethiol-modified Carbon Paste Electrode Prepared by Inset Modification: A Voltammetric Study

“…[16][17][18] Volumetric analysis of traces of lead was performed using electrodes modified by organic and biological molecules such as DNA, EDTA, etc. [19][20][21] In addition, a new, modified carbon paste electrode has been developed and used for the analysis of lead ions in ionic solutions. [22][23][24] The preconcentration and detection of lead was enhanced by modifying the CPE electrode with 2-benzimidazolethiol.…”