COMPARISON OF THE SQUARE-WAVE STRIPPING VOLTAMMETRY OF LEAD AND MERCURY FOLLOWING THEIR ELECTROCHEMICAL OR ABRASIVE DEPOSITION ONTO A PARAFFIN IMPREGNATED GRAPHITE ELECTRODE
S. Komorskylovric et al., COMPARISON OF THE SQUARE-WAVE STRIPPING VOLTAMMETRY OF LEAD AND MERCURY FOLLOWING THEIR ELECTROCHEMICAL OR ABRASIVE DEPOSITION ONTO A PARAFFIN IMPREGNATED GRAPHITE ELECTRODE, Analytica chimica acta, 258(2), 1992, pp. 299-305
Square-wave stripping voltammograms of lead and mercury mechanically t
ransferred to the surface of a paraffin impregnated graphite electrode
by abrasion are compared with the responses of these metals on the sa
me electrode after their electrodeposition from solution. In the case
of lead, the abrasion method appears to give rise to the formation of
small, well-separated patches of polycrystalline metallic lead on the
electrode surface. Similarly, the square-wave response for oxidation o
f mercury attached to the electrode by adhesion is different to that f
or an electrochemically deposited so-called mercury thin film electrod
e, implying that the nature of metal layers on the graphite surface do
es depend on the method of metal transfer. Despite the apparent differ
ences in the films formed by mechanical transfer and electrochemical d
eposition of metals, the variation of the oxidation stripping peaks on
the square wave signal parameters is independent of the accumulation
method.