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.
Characterization and Analytical Applications of a Coenzyme-AChemically Modified Gold Electrode
MERLI, DANIELE;TREDICI, ILENIA GIUSEPPINA;PESAVENTO, MARIA;PROFUMO, ANTONELLA
2012-01-01
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
