Nevertheless in our studies were found various regularities, statistically significant inter-elemental correlations and correlations between elements in tissues and fluids versus clinic and biochemical data. Essentiality of scandium was newer proven using accepted criteria of elements. For many years in our laboratory were carried out studies on animals and human tissues and fluids elemental composition using INAA in which data for scandium were obtained as 'redundant' information. Scandium is an element which is very 'simple' for instrumental neutron activation analysis (INAA). One of the 'strange' elements in this connection is scandium. ![]() On the other hand their essentiality is still under doubt. In many cases these elements presumably play important role in the Life. Nevertheless essentiality of at least 55 chemical elements (more than a half of number of natural elements) is still not accepted. It is also well known that all chemical elements present in the living matter. Makhmudov, E.A.įull text: Role of constitutional and essential elements in Life is known quite well. Scandium - problem of ultra-trace-element essentiality ![]() Further purification step using fresh silica gel column, can separate escaped titanium from scandium. Based on those result, it can be concluded that there are still titanium portion in scandium after the separation using a silica gel column. In determination of recovery of titanium from silica gel, 51.76 ± 5.5% of the 20 mg Ti can be recovered from silica gel column using 5M HCl eluent, whereas remaining Ti were eluted using 40 ml of HCl 5M. During elution of scandium from silica gel column, 2.81 grams of 20 mg of titanium came apart as breakthrough. From 51.60% of absorbed scandium in the column, 98.29 ± 3.4% were eluted with 5 mL of H 2 O eluent. Only 51.60 ± 4.5% of 5 mg of scandium could be retained in the silica gel column. In the determination of scandium released from silica gel, Sc-46 radiotracer was used. Sc and Ti mixture is separated by passing it through a column of silica gel. 20 mg of TiO 2 and 5 mg of Sc 2 O 3 dissolved using 0.5 mL of 50% HF solvent with gentle heating at 60Â☌ - 80Â☌ for 1 hour then 4.5 mL H 2 O was added. This system will be used in the separation of medical radioisotopes of 47 Sc from TiO 2 enriched targets. In this study, quality test of scandium and titanium mixture separation system using a silica gel column has been conducted. Muhamad Basit Febrian Yanuar Setiadi Duyeh Setiawan Titin Sri Mulyati Nana Suherman The grain refinement led to the reduction in solidification cracking and improved the tensile properties of fusion zone compared to the ones obtained by the commercial AA5556 fillerĪnalysis of separation quality of scandium-46 and titanium using silica gel column It was observed that addition of scandium led to very significant grain refinement in the fusion zone especially for scandium levels greater than the eutectic composition (0. The microstructure and mechanical properties of fusion zones of medium strength Al-Zn-Mg alloy (RDE-40) welds obtained by using different fillers containing various amount of scandium was investigated. International Nuclear Information System (INIS)ĭev, Selvi Stuart, A. This method maximizes recovery of scandium while maintaining purity.Įffect of scandium additions on microstructure and mechanical properties of Al-Zn-Mg alloy welds This eliminates the HEDTA ion and other monovalent cations contaminating the scandium band. Recovery of scandium is improved by pumping dilute scandium over the column prior to stripping the scandium and precipitation. The temperature, pH and concentration of the eluent HEDTA are controlled in order to maintain the scandium in the column while minimizing dilution of the scandium band. ![]() Burkholder, Harvey R.Īn improvement in purification of scandium through ion exchange chromatography is disclosed in which the oxidation potential of the eluting solution is altered by the addition of potassium chlorate or ammonium chloride so that removal of contaminants is encouraged.
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