Sorption of technetium on inorganic sorbents and natural mineralsстатья
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Дата последнего поиска статьи во внешних источниках: 17 января 2018 г.
Аннотация:The sorption behavior of the pertechnetate anion in various solid-solution systems under aerobic conditions and pH 1.3-12.5 has been investigated. Batch techniques were employed. On most of natural minerals only surface adsorption occurs. R(s)-values were no larger than 2.0 ml . g-1. Adsorption on various natural minerals and rocks such as sandstone, basalt, granite, pyrite, peat and others are compared with the analogous processes on artificial inorganic sorbents: titanium oxides (thermoxide-34, thermoxide-3), crystalline cadmium sulfide, zirconium phosphate, and complex inorganic sorbents: antimony oxide - silicon oxide - phosphorus pentoxide, antimony oxide - silicon oxide - aluminium oxide, lithium oxide - manganese oxide - aluminium oxide - water, lithium oxide - titanium oxide -chromium oxide - water. For comparison the sorption of Tc on some organic sorbents was included. The solubility of Tc2S7 in water was measured to be 0.257 g/l. It has been shown that preliminary irradiation of sorbents such as sandstone, peat and humic acid by gamma-rays with doses not less than 10(7) rad results in the decrease of Tc(VII) sorption.