[en] Sample composition and mass affect strontium isolation and chemical recovery. The isolation of small amounts of strontium from complex samples (soils and sediments) is difficult because it requires separation from large amounts of calcium, iron and other elements. There are a few options to treat samples such as complete decomposition, leaching with acids and/or ion exchanger. Complete decomposition (dissolving) is possible with samples not heavier than 10 g. Leaching with acids requires large amounts of acids and a lot of time. This paper describes the influence of sample treatment on determination of low activities of radioactive strontium. The strong cation exchanger can be used for the strontium isolation from soil and sediment samples. Separation of soil from exchanger and cation elution with HNO₃ are followed. Exchanger quantity used in the analysis depends on sample quantity. Efficiency of isolation depends on exchanger quantity and contact time between exchanger and suspension. The cation exchange procedure used in strontium isolation methods enables simple subsequent chromatographic separation of strontium from calcium and other elements with higher recovery on the chromatographic column.(author)

[en] In affi liation section, line 3, “Bisha University” should be replaced by “University of Bisha.”

[en] Inorganic ion exchangers are finding increasing applications in nuclear industry due to their unique features like chemical stability, selectivity, thermal and radiation stability and less extent of swelling as compared to organic ion exchangers. Gusikan et al have prepared semi crystalline Zirconium phosphosilicate (ZPS), an inorganic ion exchanger using precipitation route. Silica gel supported zirconium phosphate has also been prepared by Le VAN SO. But, reports indicate that inorganic ion exchangers, in the form of well defined particles with an acceptable particle size are difficult to prepare. The present work was aimed at preparing zirconium phosphosilicate with granular particles, good surface area and porosity and using it for sorption studies of plutonium and uranium

[en] The present work deals with the study of lanthanum fixation from aqueous solution by a mineral ion exchanger. The main purpose of the work consists in investigating the opportunity of the use of natural clays and miscellaneous other materials in the rare earths wastes treatment and this could be of a capacity adsorption of various montmorillonite samples was determined in nitric acid media. The effect of temperature and the solid/liquid phase ratio was examined in order to establish Langmuir and Frendlish adsorption isotherms of lanthanum salts from synthetic aqueous solution. It was also found that both adsorption and ion-exchange phenomena take place simultaneously and that the predonderence of the one upon the order is dependent on the operating conditions

No abstract available

[en] Short communication. 3 refs

[en] Present work is devoted to evaluation of dynamics of extraction process of lithium from solutions.

[en] A new three components inorganic ion exchange material lithium zirconium silicate (LiZrSi) has been synthesized by adding a mixture of lithium hydroxide (LiOH) and zirconium oxychloride(ZrOCl₂) to sodium metasilicate (Na₂SiO₃) at different ratios. The synthesized materials ratios I, II and III have been characterized on the basis of chemical composition, X-ray fluorescence, XRD, Fourier Transform Infrared Spectroscopy (FTIR) and thermal analysis. From the data obtained, the synthesized different ratios of lithium zirconium silicates can be written as (ZrO)2Li₂(SiO3₎3. 10.7H₂O, (ZrO)Li₂(SiO₃)2. 5.3H2O and (ZrO)Li₄(SiO₃.₃. 4.4H₂O with amorphous structure. The solubility of the materials has been tested in water and acidic media. The ion exchange capacities of these materials for Na⁺, K⁺ and Cs+ ions have been found to take the order Na⁺ > K⁺ > Cs⁺ for all synthesized materials and depend on the ionic radii of exchanging cations

[en] A zeolitic adsorbent was synthesized from powdered waste porcelain kept at 80^oC for 24 h. The product contained the zeolite phases Na-P1 and hydroxysodalite. The product with the highest cation exchange capacity (CEC) was synthesized using 4 M NaOH and the sample weight / volume of alkali solution ratio was 1/4. The highest CEC obtained for the product was almost 1900 mmol/kg, which is the same as that of natural zeolite. The product with the highest CEC was tested for its ability to remove heavy metals (Fe, Cu, Ni, Zn, Pb, Cd, Mn, Cr, Al, B,Mo) from an acidic solution (pH 2). The product can neutralize the acidic solution to almost pH 7, and the capacity of the product for the removal of heavy metals is higher than that of the natural zeolite, except for Mo and B. (authors)

[en] The fundamentals of the theory of theoretical plate height and its use in column elution chromatography are given and the most important relations for gradient chromatography are presented. General knowledge is described related to the possibilities of separating the individual ion groups arranged according to the periodic system from the mixtures. Detailed descriptions are given of laboratory procedures used for the separation of selected elements and ions from the mixtures. Tables are given showing the possibilities of separating the individual elements from different mixtures, the most suitable types of ion exchangers and conditions of this separation are given. The principles are explained of the use of ion exchangers in the preparation of certain radioisotopes and a survey is presented of generators of short-lived radionuclides. (L.K.)