The resistance of HCl solution without supporting electrolyte at a microelectrode was evaluated by the ac impedance technique of which the dc-potential was in the diffusion-controlled domain for the reduction of the hydrogen ion. The hydrogen ion is reduced to hydrogen gas. The Cl takes the same concentration profile as the hydrogen ion in order to keep electric neutrality. Then, no ion is pres...

This work deals with the electrochemical degradation and mineralization of perfluorooctanoic acid (PFOA). Model aqueous solutions of PFOA (100mg/L) were electro-oxidized under galvanostatic conditions in a flow-by undivided cell provided with a tungsten cathode and an anode formed by a commercial ultrananocrystalline boron doped diamond (BDD) coating on a niobium substrate. A systematic experim...

The surface of glassy carbon (GC) electrode has been modified by oxidation of L-cysteine. The covalent modified GC electrode with L-Cysteine has been studied, according the supporting electrolyte used. Favourable interactions between the L-cysteine film and DA enhance the current response compared to that at the Nafion GC and bare GC electrodes, achieving better performances than those other el...

Camptothecin (CPT) is a cytotoxic quinoline alkaloid endowed with the inhibition of topoisomerase I, an essential enzyme for the normal functioning of DNA. The redox behaviour of CPT was investigated at a glassy carbon electrode using cyclic, differential pulse and square wave voltammetry. It was shown that CPT can undergo reduction in a pH-dependent mechanism. In acid media only one irreversib...

Zinc is an interesting target for detection as it is one of the elements necessary for the proper functioning of the human body, its excess and deficiency can cause several symptoms. Several techniques including electrochemistry have been developed but require laboratory equipment, preparative steps and mercury or complex working electrodes. We here described the development of a robust, simple...

Chronoamperometric transients are recorded in different quantities of supporting electrolyte, from full to self-support, for one electron transfer reactions of redox systems carrying diverse charges, and are studied to dissect migrational and diffusional contributions to mass transport under different conditions (applied overpotential, electrode radius, kinetics and charge of electroactive spec...