Microwire chronoamperometric determination of concentration, diffusivity, and salinity for simultaneous oxygen and proton reduction

A microwire chronoamperometric method is reported employing a 25 mm diameter platinum microwire for multi-parameter electroanalysis with digital simulation-based evaluation (employing DigiElch 4.F). Concentration and diffusion coefficient data are obtained for the reduction of oxygen and for the reduction of protons individually and simultaneously in saline (0.1 M to 4.0 M NaCl) electrolyte media. The diffusion coefficient and concentration data for oxygen allows salinity levels to be estimated. The microwire chronoamperometry method offers versatility and precision due to (i) a slow approach to steady state (when compared to microdisc methods) and (ii) insignificant viscosity effects (when compared to hydrodynamic methods).