Potentiometric and voltammetric detection using a two-channel fountain cell

The design and use of a two-channel fountain cell in potentiometric and voltammetric detection is described. The two flows produced two distinct sectors inside the thin layer region and one of the sectors was used as the internal electrolyte of a reference electrode built into the cell body and the other as the indicator/counter electrode section. The behavior of the flowthrough Ag/AgCl reference electrode was first investigated and found satisfactory and it was then employed as the reference electrode in the subsequent experiments. Continuous and flow-injection measurements were made using the Fe(III)/Fe(II) redox couple in potentiometry and the reduction of Fe(III) in voltammetry.