ISSN:
1040-0397
Keywords:
Metal speciation
;
polysaccharides
;
voltammetry
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Complex formation of Zn(II) and Pb(II) with alginates and pectins was studied by normal-pulse (NPP), reverse-pulse (RPP), and differential-pulse polarography (DPP), cyclic voltammetry (CV), and differential pulse anodic stripping voltammetry (DPASV). 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 Zn(II) and Pb(II), are evidenced clearly by NPP. On the other hand, induced adsorption of metal ions is minimized under the RPP conditions. The reversibility of the redox couples Zn2+/Zn(Hg) and Pb2+/Pb(Hg) is not strongly affected by the presence of polysaccharides. Titrations of Zn(II) and Pb(II) with alginates or pectins were carried out by DPP and DPASV in order to determine formation constants, which was only found for the Zn(II)-ion systems.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140040804
