Use of mercury drop electrodes for polarographic measurements in flowing solutions

Abstract

The use of dropping mercury, hanging mercury drop, and static mercury drop electrodes in flow analysis and liquid chromatography is reviewed. Theoretical considerations (particularly flow rate dependence), measuring techniques, designs of flow-through detectors, and methods of oxygen removal in flow systems are discussed. A brief guide to flow applications of mercury electrodes is also given.

Basic principles of voltammetry

“…The rnixture of graphite with organic binder possesses the ability of extracting the analyte from the solution into the surface layer of the electrode [147]; this feature improves the preconcentration process. The application of permselective polymer coatings with incorporated special functional groups acting as electrocatalysts [ 148,149] enhances both the selectivity and the rate of the electrode reaction in the stripping period. The determination of trace amounts of mercury using Nafion membranes on glassy carbon electrodes with incorporated Schiffbase may be reported as an example [ 150].…”