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Metal‐Halide‐Complex and Ligand Simultaneous Adsorption. Chronocoulometry Study in the Cd(II), KI/Hg System at Several Ionic Strengths
Author(s) -
Guaus Ester,
Sanz Fausto
Publication year - 1999
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/(sici)1521-4109(199905)11:6<424::aid-elan424>3.0.co;2-n
Subject(s) - chemistry , adsorption , bromide , halide , iodide , metal , inorganic chemistry , ionic bonding , ligand (biochemistry) , ionic strength , tetracoordinate , metal ions in aqueous solution , ion , organic chemistry , aqueous solution , biochemistry , receptor , computer graphics (images) , computer science , planar
The previous approach developed to study anion‐induced adsorption of Cd(II) halide solutions [10] is applied to the Cd(II)‐iodide system at several ionic strengths. The experimental surface excess of Cd(II) is calculated for single step chronocoulmetry and a new expression for the change of capacitive charge during the potential step has been obtained in order to include the change in ligand adsorption promoted by the adsorption of the metal complexes. As was obtained in bromide medium, the approach allows one to conclude that the anionic tricoordinate, CdI 3 – , and tetracoordinate, CdI 4 2– , metal complexes are the adsorbed species on the electrode surface predominating the adsorption of CdI 4 2 – , as ionic strength became higher.