Premium
Anodic Stripping Voltammetry of Metal Ions in Mixtures of Ligands
Author(s) -
Berbel Francisco,
Cortés Javier,
DíazCruz José Manuel,
Ariño Cristina,
Esteban Miquel
Publication year - 1998
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(199805)10:6<417::aid-elan417>3.0.co;2-j
Subject(s) - polarography , chemistry , stripping (fiber) , anodic stripping voltammetry , voltammetry , metal , metal ions in aqueous solution , adsorption , diffusion , inorganic chemistry , ion , macromolecule , ligand (biochemistry) , analytical chemistry (journal) , thermodynamics , electrochemistry , electrode , chromatography , organic chemistry , materials science , receptor , composite material , biochemistry , physics
A model, originally developed for polarography of metal ions in mixtures of macromolecular and simple ligands, is extended to stripping voltammetric measurements carried out in such systems. Among other hypotheses, the model assumes excess of ligand and absence of both electrodic adsorption and kinetic effects (complexes are supposed to be totally labile or totally inert). The different hydrodynamic conditions in stripping voltammetry in respect to polarography make it necessary to modify some equations of the original model. The reliability of this semiempirical approach is tested by studying the Zn II + polymethacrylic acid + phthalate system, which is a typical system with labile complexation, The mean values of the formation constant and diffusion coefficient ratio obtained by this approach are quite similar to those determined from polarographic experiments. The introduction of a semiempirical hydrodynamic parameter p , analogous to that previously used in the model for a unique macromolecular complex, yields satisfactory results.