The determination of radiostrontium in biological and environmental samples generally requires its preliminary separation and preconcentration, both to remove radionuclides that may interfere with ...

Characterization of an Improved Extraction Chromatographic Material for the Separation and Preconcentration of Strontium from Acidic Media

A general classification of separation methods is attempted. The two criteria were phase transformations and interfacial transfers. All separation methods of homogenous mixtures were divided into five groups: (i) methods that are based on the formation of new phases by substances to be separated; (ii) methods that are based on differences in the interphase distribution processes, chromatographic methods being singled out as a separate group; (iii) membrane methods that are based on induced transfers of substances from one phase into another one across a third phase, which separates the two; (iv) separation methods within a single phase that are based on velocity and direction differences in spatial displacement of particles of substances to be separated within one fluid phase under the action of various fields; and (v) combined methods working combining previously listed methods.Descriptions of each group of separation methods include their intragroup classification and information on the most important t...

/pdf/a-classification-of-separation-methods-2i62v1wbhm.pdf

A Classification of Separation Methods

Analysis of complex aromatic hydrocarbon mixtures with solid silver nitrate columns

The present study is conducted for developing separation of some elements of nuclear interest from zirconium-concentrate explored from Egyptian zircon mineral, using certain cationic exchangers. Th...

Potential separation of zirconium and some lanthanides of the nuclear and industrial interest from zircon mineral using cation exchanger resin

Polyurethane foam loaded with Aliquat 336 was prepared. The suitability of the prepared reagent foam for the separation of various relative concentrations of iron and cobalt in acidic aqueous solutions was confirmed using the static technique. The separation of other metal couples was achieved on the basis of similar ideas. Columns packed with the Aliquat foam were successfully used in the separation of iron or cadmium from cobalt and nickel. The foam column performance proved quite reasonable, and the application of relatively high flow rates (10 mL/min) was found to be possible.

Separation of Iron, Cobalt, Nickel, and Cadmium in Aqueous Acid Halide Solution Using Aliquat-Foam Columns

Publisher Summary This chapter discusses the use of cellular plastics in extraction chromatography. The basic idea of the application of cellular plastics as supports is that chromatographic adsorption, exchange and partition processes can be favorably influenced by giving an adsorbent a hollow spherical (cellular) form and affecting the adsorption on the internal surface of cells. This can be done by using solid, rigid or flexible open-cell-type foamed synthetic polymers as column fillings. The chemical and physical properties of cellular plastics are described in the chapter. Preliminary experiments on different cellular plastics commercially available (polyvinyl chloride, viscose, rubber, and polyurethane) showed that polyurethane foam was at that time most suitable for application as support in extraction chromatography. In all types of chromatographic techniques, column preparation is of prime importance. Column preparation is a very critical step; it is the one where reversed-phase art plays an important role. The application of foam-filled columns in some inorganic and radiochemical separations is also reviewed in the chapter.

Chapter 13 Use of Cellular Plastics in Extraction Chromatography

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Chapter 13 Use of Cellular Plastics in Extraction Chromatography