A study on extraction of thorium with 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 (PMBP)-loaded polyurethane foam is described. Open-cell polyurethane foam has proved to be effective as supporting material for PMBP. Thorium nitrate can be quantitatively extracted by PMBP-loaded polyurethane foam over a wide pH range. The effect of equilibrium time, pH, thorium concentration, various anions and flow-rate on the extraction efficiency of thorium is examined. A technique of extraction chromatography column with PMBP foam cylinder has been developed for trace thorium analysis of bulky water samples.

Pmbp-loaded polyurethane foam as an extractant for thorium nitrate from aqueous solution

Publisher Summary Chelating agents are mostly solid; therefore, they have to be used dissolved in appropriate organic solvents. In comparison with liquid extractants, the capacity of a stationary organic phase is smaller. After the evaporation of a solvent, the precipitation of a solid agent as well as of metal chelates can occur. The solvent extraction of metal chelates has some advantages compared to other types of extractants. The overall two-phase heterogeneous reaction can be described by relatively simple equations that relate the distribution ratio D with pH, the concentration of the extractant in an organic phase, and the concentration of masking agents in an aqueous phase. The chapter describes the influence of kinetic factors. Being a dynamic process, extraction chromatography is affected by the kinetics of extraction. Scarce information is available regarding the rate of extraction, particularly re-extraction processes.

Chapter 11 Chelating Agents as Stationary Phase in Extraction Chromatography

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Chapter 11 Chelating Agents as Stationary Phase in Extraction Chromatography