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2007 | 5 | 1 | 291-302

Article title

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


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Cd(II) plus iodide species were extracted into PEG-rich phases in the aqueous PEG(1550)-(NH4)2SO4 system at pH 2.05–7.12. IR spectra show that increasing (NH4)2SO4 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.










Physical description


1 - 3 - 2007
1 - 3 - 2007


  • Department of Analytical Chemistry, Faculty of Chemical Engineering, Technical University “Gh. Asachi”, 700050, Iaşi, Romania
  • Department of Geology — Geochemistry, Faculty of Geography and Geology, “Al. I. Cuza” University, 700050, Iaşi, Romania
  • Department of Analytical Chemistry, Faculty of Chemical Engineering, Technical University “Gh. Asachi”, 700050, Iaşi, Romania
  • Department of Natural and Synthetic Polymers, Faculty of Chemical Engineering, Technical University “Gh. Asachi”, 700050, Iaşi, Romania


  • [1] A.E. Visser, S.T. Griffin, C.C. Ingenito, D.H. Hartman, J.G. Huddleston and R.D. Rogers: “Aqueous biphasic systems as a novel environmentally benign separation technology for metal ion removal”, Metal Sep. Technol. Beyond, (2000), pp. 119–130.
  • [2] R.D. Rogers, A.H. Bond and C.B. Bauer: “Metal Ion Separation in Aqueous Polyethylene Glycol-Based Aqueous Biphasic Systems”, Sep. Sci. Technol., Vol. 28(5), (1993), pp. 1091–1126. http://dx.doi.org/10.1080/01496399308018023[Crossref]
  • [3] J.G. Huddleston, H.D. Willauer, S.T. Griffin and R.D. Rogers: “Aqueous Polymeric Solutions as Environmentally Benign Liquid/Liquid Extraction Media”, Ind. Eng. Chem. Res., Vol. 38, (1999), pp. 2523–2539. http://dx.doi.org/10.1021/ie980505m[Crossref]
  • [4] R.D. Rogers, A. H. Bond, C.B. Bauer, J. Zhang and S.T. Griffin: “Metal ion separation in polyethylene glycol-based aqueous biphasic systems: correlation of partition behaviour with available thermodynamic hydration data”, J. Chromatogr. B, Vol. 680, (1996), pp. 221–229. http://dx.doi.org/10.1016/0378-4347(95)00447-5[Crossref]
  • [5] M. Shibukawa, N. Nakayama, T. Hayashi, D. Shibuya, Y. Endo and S. Kawamura: “Extraction behaviour of metal ions in aqueous polyethylene glycol - sodium sulphate systems in presence of iodide and thiocyanate ions”, Anal. Chim. Acta, Vol. 427, (2001), pp. 293–300. http://dx.doi.org/10.1016/S0003-2670(00)01207-1[Crossref]
  • [6] T.A. Graber, B.A. Andrews and J.A. Asenjo: “Model for the partition of metal ions in an aqueous two-phase system”, J. Chromatogr. B, Vol. 743, (2000), pp. 57–64. http://dx.doi.org/10.1016/S0378-4347(00)00086-4[Crossref]
  • [7] R.D. Rogers, A.H. Bond and C.B. Bauer: “Polyethylene glycol-based aqueous biphasic system for liquid/liquid extraction of environmentally toxic heavy metal”, Solv. Extr. in Proc. Ind., Vol. 3, (1993), pp. 1641–1648.
  • [8] R.D. Rogers, S.T. Griffin: “Partitioning of mercury in aqueous biphasic systems and on ABEC™ resins”, J. Chromatogr. B, Vol. 711, (1998), pp. 277–283. http://dx.doi.org/10.1016/S0378-4347(98)00087-5[Crossref]
  • [9] L. Bulgariu and D. Bulgariu: “Hg(II) extraction in a PEG-based aqueous two-phase system in the presence of halide ions. I. Liquid phase analysis”, Central Europ. J. Chem., Vol. 4(2), (2006), pp. 246–257. http://dx.doi.org/10.2478/s11532-006-0009-1[Crossref]
  • [10] I. Sarghie: Metode de separare in chimia analitica, Gh. Asachi, Iasi, 2001.
  • [11] N. Perescu: Chimia extractiei cu solventi si aplicatii, Academiei R.S.R, Bucharest, 1985.
  • [12] E. Jercan: Metode de separare in chimia analitica, Tehnica, Bucharest, 1983.
  • [13] L. Bulgariu and I. Sarghie: “The Cd(II) extraction in polyethylene glycol-based aqueous two-phase systems in presence of iodide ions. I. The preliminary results”, Anal. St. Univ “Al. I. Cuza”, Vol. XIII, (2005), pp. 27–34.
  • [14] J.A. Dean: Analytical Chemistry Handbook, McGrow-Hill Inc., New York, 1995.
  • [15] H. Kitano, K. Ichikawa, M. Ide, M. Fukada and W. Mizuno: “Fourier Transform Infrared Study of the State of Water Molecules Sorbed to Poly(ethylene glycol) Films”, Langmuir, Vol. 17, (2001), pp. 1889–1895. http://dx.doi.org/10.1021/la0008986[Crossref]
  • [16] H. Cabezas Jr.: “Theory of phase formation in aqueous two-phase systems”, J. Chromatogr. B, Vol. 680, (1996), pp. 3–30. http://dx.doi.org/10.1016/0378-4347(96)00042-4[Crossref]
  • [17] K.P. Ananthapadmanabhan and E.D. Goddar: “Aqueous Biphasic Formation in Polethylene Oxide - Inorganic Salt Systems”, Langmuir, Vol. 3, (1987), pp. 25–31. http://dx.doi.org/10.1021/la00073a005[Crossref]

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