Adsorption of lead (II) on mercury electrodes from chloride‐bromide mixtures of high ionic strength | Zendy

Zelić Marina | Zendy; Branica Marko | Zendy

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Adsorption of lead (II) on mercury electrodes from chloride‐bromide mixtures of high ionic strength

Author(s) -

Zelić Marina,

Branica Marko

Publication year - 1992

Publication title -

electroanalysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.574

H-Index - 128

eISSN - 1521-4109

pISSN - 1040-0397

DOI - 10.1002/elan.1140040604

Subject(s) - chemistry , polarography , bromide , inorganic chemistry , adsorption , dropping mercury electrode , ionic strength , chloride , mercury (programming language) , hanging mercury drop electrode , ionic bonding , electrode , metal , ion , voltammetry , electrochemistry , aqueous solution , organic chemistry , computer science , programming language

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 PbBr 2 with previously adsorbed free bromide ions and the formation of PbBr 3 − at the mercury drop. Adsorption effects are highly pronounced, even when PbBr 2 o 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 PbBr 2 o and a mixed‐ligand complex PbBr 2 Cl x˙ x− .

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