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Unloaded polyether type polyurethane foams as solid extractants for trace elements

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Abstract

Polyether type polyurethane foams (PU) are regular stacks of solid quasi-spherical membranes produced by the reaction of polyisocyanates with polyols of polyether nature in the presence of a catalyst and a blowing agent. Contrary to conventional membrane separations, where a solid membrane is merely a differentially separating agent, or a transport medium, PU foams, apart from separation and preconcentration, also retain, i.e., sorb the species on, or in the membranes. Therefore, PU foam membranes can be considered to act as true sorbents. The membrane properties of PU foam sorbents offer unique advantages over conventional bulk type granular sorbents in rapid, versatile and effective separations and preconcentrations of different compounds from fluid samples. Unloaded PU foam sorbents have received considerable attention in the separation of different trace inorganic species.

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Palágyi, S., Braun, T. Unloaded polyether type polyurethane foams as solid extractants for trace elements. Journal of Radioanalytical and Nuclear Chemistry, Articles 163, 69–79 (1992). https://doi.org/10.1007/BF02037481

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