Voltammetry of Pb(II), Cd(II) and Zn(II) ions in the presence of the sulphated polysaccharide λ-carrageenan

✍ Scribed by Maria Dolors Giménez; Cristina Ariño; Miquel Esteban

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 764 KB
• Volume: 310
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(95)00107-b

✦ Synopsis

A systematic study of the voltammetric redox processes of PMII), Cd(I1) and Z&I) in the presence of A-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 A-carrageenan allow the determination of the global formation constant of each system and their dependences on KNO, (supporting electrolyte) concentration and pH values. Reversibility of the redox couples M(II)/M(Hg) is not strongly affected by the presence of A-carrageenan, which gives small non-Faradaic signals. In the time scale of used techniques M(II)/A-carrageenan systems seem to be of labile nature.