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

A microwire chronoamperometric method is reported employing a 25μm 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 (0.1M to 4.0M 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).