Abstract
A systematic study of the voltammetric redox processes of Pb(II), Cd(II) and Zn(II) in the presence of λ-carrageenan has been made by normal pulse, reverse pulse, and differential pulse polarography, as well as by differential pulse anodic stripping voltammetry. Titrations of metal ions with λ-carrageenan allow the determination of the global formation constant of each system and their dependences on KNO 3 (supporting electrolyte) concentration and pH values. Reversibility of the redox couples M(II) M(Hg) is not strongly affected by the presence of λ-carrageenan, which gives small non-Faradaic signals. In the time scale of used techniques M( II)/ λ-carrageenan systems seem to be of labile nature.
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