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Cyclic voltammetry of metal/polyelectrolyte complexes: Complexes of cadmium and lead with deoxyribonucleic acid
Author(s) -
Séquaris J.M.,
Esteban M.
Publication year - 1990
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.1140020108
Subject(s) - chemistry , cyclic voltammetry , adsorption , polyelectrolyte , cadmium , metal , dropping mercury electrode , inorganic chemistry , electrode , voltammetry , stability constants of complexes , metal ions in aqueous solution , ion , analytical chemistry (journal) , electrochemistry , chromatography , organic chemistry , polymer
Cyclic voltammetry was used for the determination of the association constants of Pb 2+ and Cd 2+ with deoxyribonucleic acid. The adsorption of the biological polyelectrolyte at the mercury electrode surface was controlled by the alternating current voltammetric method, which permits corrective factors to be introduced in the evaluation of cyclic voltammetric responses. The results are based on the analysis of the labile complexation of the slow‐diffusing DNA by studying the current intensity peak as well as the peak potential shift of Pb 2+ and Cd 2+ . The association constants (β) obtained from the two treatments are in satisfactory agreement. The dependence of the conditional association constant (β 1 ) for the Cd‐DNA system on the monovalent ion (Na + ) concentration is also reported.