Flow-through Electrochemical Cell Research Articles

Development of a polymer dispersed-mercury modified electrode

A polymer dispersed-mercury modified electrode, which was prepared by coating polypyrrole on a thin mercury film electrode using fast-sweep voltammetry, has been developed. The electrode was tested and compared with a conventional thin-film mercury electrode in a stationary cell. The new polymeric electrodes were also employed in a flow-through electrochemical cell using reversed-pulse amperometric detection. The selectivity of the polymeric electrode was modified by incorporating different counter ions during the polymerization process.

Digital simulation of the channel flow-through electrochemical cell: A theorectical study of the determination of solute adsorption on modified electrodes

Digital simulation is carried out to simulate transfer in a channel flow-through electrochemical cell to determine whether or not adsorption at the electrode surface can be studied in a chromatographic experiment. The theory suggests that the answer is a qualified, “yes”. When done correctly the retention of a solute is perceptible when the equilibrium constant for its association with a surface site is 10 2 M −1, and quantitatible when K = 10 3 M −1. The experiment must be done in a way that maximizes the phase ratio.

Stopped-flow linear sweep voltammetry at the reticulated vitreous carbon electrode in a flow injection system : Determination of dopamine in the presence of ascorbic acid

A flow injection system was used to introduce a sample in to a flow-through electrochemical cell based on a reticulated vitreous carbon (r.v.c.) electrode. Products of the initial electrolysis are trapped in the porous electrode by stopping the flow. Linear sweep voltammetry under stopped-flow conditions forms the basis of a determination of a reversibly electrolyzed species in the presence of an irreversibly electrolyzed species. The determination of dopamine in the presence of ascorbic acid was used as an illustrative example. Response varied linearly with dopamine concentration between 8 X 10 −7 and 3 X 10 −5 M and the detection limit (S/N = 3) was 5 X 10 −7 M dopamine.

Flow-through electrochemical cell with open liquid junction

Flow-through electrochemical cell with open liquid junction

Small-volume solid-elcetrode flow-through electrochemical cells : Preliminary evaluation using pulse polarographic techniques

A preliminary evaluation is given of the use of potentiostatic pulse polarographic techniques for solid-electrode flow-through electrochemical cells as detectors for use in both automated analysis and liquid chromatography. The following advanatages are noted over previously reported constant-applied-potential techniques: increased sensitivity, minimal effect of flow-rate on current measurement and a vast increase in electrode stability for the short-term sampling period and for extended routing operation.