Feature Article
Adsorption of lead (II) on mercury electrodes from chloride‐bromide mixtures of high ionic strength
Abstract
The adsorption of lead (II) from chloride‐bromide mixtures of a high ionic strength (I=4 mol/L) to mercury electrodes was studied using square wave voltammetry, differential, and normal pulse polarography. The presence of excess chloride ions in the solution prevents additional surface complexation of PbBr2 with previously adsorbed free bromide ions and the formation of PbBr3− at the mercury drop. Adsorption effects are highly pronounced, even when PbBr2o makes less than 1% of dissolved metal, indicating that a mixed‐ligand species could be attached to the electrode. It is possible to explain nearly all experimental results by the surface activity of both PbBr2o and a mixed‐ligand complex PbBr2Cl
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Citing Literature
Number of times cited: 3
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