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Characterization and Analytical Applications of a Coenzyme‐A Chemically Modified Gold Electrode
Author(s) -
Merli Daniele,
Zavarise Francesca,
Tredici Ilenia,
Pesavento Maria,
Profumo Antonella
Publication year - 2012
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.201100420
Subject(s) - chemistry , metal ions in aqueous solution , voltammetry , inorganic chemistry , ion , anodic stripping voltammetry , electrode , stripping (fiber) , metal , chemisorption , electrochemistry , materials science , organic chemistry , adsorption , composite material
A gold electrode modified by chemisorption of Coenzyme A (CoA‐CME) has been prepared. Exploiting its complexation properties towards heavy metal ions usually present in natural waters, it was shown that CoA has a stronger interaction with Cu than with the Pb and Cd; the complexation constants of bounded CoA with these ions were calculated by a novel approach. The metal ions can be determined in natural waters at the CoA‐CME by open circuit preconcentration followed by medium exchange in citrate buffer before the anodic stripping voltammetry. The presence in solution of competing ligands and important aspects regarding the complexation were investigated.