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Application of a chelite P modified carbon paste electrode to copper analysis and speciation
Author(s) -
Agraz Raquel,
De Miguel Javier,
Sevilla MariaTeresa,
Hernandez Lucas
Publication year - 1996
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.1140080612
Subject(s) - copper , differential pulse voltammetry , detection limit , voltammetry , carbon paste electrode , iminodiacetic acid , chemistry , cyclic voltammetry , inorganic chemistry , chelation , genetic algorithm , carbon fibers , electrode , chelating resin , materials science , metal ions in aqueous solution , metal , electrochemistry , chromatography , organic chemistry , composite number , composite material , biology , evolutionary biology
Abstract A carbon paste electrode modified with the commercial resin Chelite P, containing amino‐phosphonic groups, was used in the determination and speciation of copper. Copper analysis was performed with cyclic voltammetry and differential pulse voltammetry, allowing copper determination in the μg/L level. A detection limit of 1.9 μg/L (3α) was found for a 10 min preconcentration. Interferences from other ions and organic substances were examined. For speciation purposes, a ligand competition methodology was used and different model ligands in solution were tested. Copper complexes were characterized as a function of their thermodynamic and kinetics properties. Results were compared with those obtained employing a strong chelating resin (containing iminodiacetic acid) as electrode modifier. The method was applied to a water sample from the Jarama river in Madrid, where copper was mainly present as strong low‐dissociating complexes.