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Voltammetric studies of copper(I) and copper(II) with monoamines at the ionic strength of seawater (0.70 M NaClO 4 )
Author(s) -
dos Santos Margarida M. Correia,
Gonçalves M. Lurdes Simões
Publication year - 1991
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.1140030210
Subject(s) - copper , ethylamine , polarography , chemistry , diethylamine , inorganic chemistry , ionic strength , adsorption , triethylamine , voltammetry , electrochemistry , ionic bonding , electrode , aqueous solution , ion , organic chemistry
The stabilization of copper(I) by some amines was analyzed by voltammetric methods at the ionic strength of seawater ( I = 0.7 M NaClO 4 ). The amines studied were ethylamine, diethylamine, triethylamine, ethanolamine, and 5‐aminopenthanol. Voltammetric methods were used because copper(I) can be produced electrochemically if the ligands in solution stabilize this oxidation state. Differential pulse polarography (DPP) and voltammetry with platinum rotating disk electrodes (RDE) were employed. Because some of the voltammograms were distorted as a result of adsorption problems, adsorption has been studied by ac polarography. For the experimental conditions of negligible adsorption, the stability constants of copper(II) and copper (1) complexes have been determined.