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Cd(II) extraction in PEG-based two-phase aqueous systems in the presence of iodide ions. Analysis of PEG-rich solid phases

✍ Scribed by Bulgariu, Laura ;Bulgariu, Dumitru ;Sârghie, Ioan ;Măluṭan, Theodor

Book ID
111487930
Publisher
Walter de Gruyter GmbH
Year
2007
Tongue
English
Weight
565 KB
Volume
5
Category
Article
ISSN
2391-5420

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✦ Synopsis

Cd(II) plus iodide species were extracted into PEG-rich phases in the aqueous PEG(1550)-(NH 4 ) 2 SO 4 system at pH 2.05 -7.12. IR spectra show that increasing (NH 4 ) 2 SO 4 solution acidity does not protonate PEG ether oxygen atoms, but decreases water content in the PEG-rich phases. Metallic species' extraction into the PEG predominantly alters how water molecules bind to polymer chains; the changes in their absorption bands depend on pH. Microscopy shows that "fixation" of the extracted metal in the PEG-rich phase occurs by specific interactions which depend on the species. These also determine changes in the polymer chains' conformation.

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