Electrode effects on impedance spectra of cement pastes were investigated by two-, three-, and four-point measurements without a potentiostat over the frequency range 0,01 Hz–10 MHz. Electrode immittance effects arising from highly resistive/capacitive contacts cannot be fully corrected by nulling procedures, Two-point~measurements are much more susceptible to such effects than threeor four-poi...

The electroanalytic performances of glassy carbon paste electrode (GCPE), multi-walled carbon nanotube (MWCNT)-GCPE and double-walled carbon nanotube (DWCNT)-GCPE, which include HNO3 washed/unwashed materials, were compared by monitoring cyclic voltammograms of potassium ferricyanide and catechol. Electrodes were prepared by introducing proper amount of DWCNT and MWCNT into GCPE. First untreate...

The cobalt (Co(II)) ion is a main component of alloys and considered to be carcinogenic, especially due to the carcinogenic and toxicological effects in the aquatic environment. The toxic trace of the Co(II) detection was conducted using the infrared photodiode electrode (IPDE) using a working electrode, via the cyclic and square-wave anodic stripping voltammetry. The results indicated a sensit...

Submit Manuscript | http://medcraveonline.com immense number of publications appeared dealing mainly with the determination of the four “classical” metals easily accessible by inverse voltammetry on mercury electrodes, i.e., Zn, Cd, Pb and Cu. Along with such prosperity in voltammetry also potentiometry slipped into its golden age with the development of new ion selective membranes for many of ...

A simple and convenient method is described for voltammetric determination of carbidopa (CD), based on its electrochemical oxidation at a modified multiwall carbon nanotube paste electrode. Under optimized conditions, the proposed method exhibited acceptable analytical performances in terms of linearity (over the concentration range from 0.1 to 700.0 μM), detection limit (65.0 nM), and reproduc...

A wax-impregnated carbon paste electrode with mercury oxalate as the bulk modifier is found to be suitable for the determination of heavy metal ions by differential pulse anodic stripping voltammetry. The contents of binder and modifier have been optimized, until they showed low background current and easy renewability. The bulk-modified electrode is applied for the simultaneous determination o...

Using the nano-porous pseudo carbon paste electrode (Nano-PPCPE) as the working electrode, mixing L-glutamate oxidase (L-GLOD), catalase (Cat) and bovine serum albumin (BSA) with phosphate buffer (PB, pH = 7.4), followed by cross-linking with glutaraldehyde, a novel L-glutamate electrochemical biosensor was successfully formed. It was demonstrated that the modified nano-PPCPE exhibits a high se...

Detection of phosphate using amperometry was investigated. The phosphomolybdate complex, formed by addition of nitric acid, ammonium molybdate and phosphate, was reduced at a carbon paste electrode polarised at +0.3V (versus Ag/AgCl). The major characteristics observed were simplicity of the equipment, a limited consumption of reagents and a low detection limit (0.3mumoll(-1)), with a linear ra...

in the present study, a new chemically modified carbon paste electrode (cpe) is constructed for rapid, accurate, simple, highly sensitive, and selective determination of mo (vi) using differential pulse voltammetry. the electrode was prepared using magnetic nickel zinc ferrite nanocomposite (ni0.5zn0.5fe2o4), as the modifier in cpe (ni0.5zn0.5fe2o4/cpe). mo (vi) was determined after preconcentr...