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Voltammetric study of cadmium(II) ion in the presence of polysaccharides
Author(s) -
Nadaly Anna M.,
Ariño Cristina,
Esteban Miquel,
Casassas Enric
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.1140030411
Subject(s) - alginic acid , polarography , chemistry , anodic stripping voltammetry , ionic strength , cadmium , adsorption , titration , polysaccharide , stability constants of complexes , redox , ionic bonding , inorganic chemistry , cyclic voltammetry , voltammetry , nuclear chemistry , ion , electrochemistry , electrode , aqueous solution , organic chemistry , biochemistry
Complex formation of Cd(II) with alginic and polygalacturonic acids is studied by normal pulse (NPP), reverse pulse (RPP), and differential pulse polarography (DPP), as well as by cyclic voltammetry (CV) and differential pulse anodic stripping voltammetry (DPASV). Titrations of Cd(II) with partially neutralized alginic or polygalacturonic acids, at different ionic strengths, by DPP and DPASV allow the precise determination of the apparent formation constant K of both systems. The systems appear to be labile on the different time scales of the various techniques. Adsorption of both polysaccharides, and the further induced adsorption of Cd(II), is evidenced clearly by NPP. On the other hand, the induced adsorption of Cd(II) is minimized under the conditions of RPP. The reversibility of the redox couple Cd 2+ /Cd(Hg) is not strongly affected by the presence of polysaccharides. Dependence of the apparent formation constants on the total ionic strength is reported.