Abstract
A novel spectroelectrochemical method based on the thermal-lens effect from electrolyte solution using regular Joule heat generation by current focussing in a small-sized channel is under development. Numerical calculations using finite-element modelling were used for a thorough estimation of experimental conditions (cell and electrode shape and size). The major interferring effects were estimated. A change in the analyte concentration near electrodes due to electrolysis is significant and is overcome by large-radius ring elctrodes and AC current. The calculations were confirmed by experiments. An advanced cell design with good reproducibility and the sensitivity of measurements down to 10-6 M is proposed.
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