The equilibria between the solution of TOA in toluene and mixtures of sulphuric and hydrochloric acid been studied. They were
characterized by ratios of stability constants of amine salts formed in the organic phase.
The cesium band traveling in an ion exchange column filled with Dowex 50X8 resin has been studied during elution with hydrochloric
acid under different conditions. The dependence of the rate of band motion on the separation factor and on the flow rate of
the eluent is given. Also the temperature dependence and the acid concentration dependence of the separation factor is shown.
The extraction of hydrochloric and sulphuric acid from their mixture by tri-n-dodecyl amine in toluene was studied. The equilibria
were investigated at high acid concentrations, so that only amine bisulphate and chloride were formed in the organic solution.
They were characterized by the stability constant ratios of the above salts.
Some properties of natural zeolite from Zaloka gorica, Slovenia, Yugoslavia were investigated to establish its applicability in solidification and for storage purposes of radioactive waste. It was found that this material is a rather good sorber for cesium, with a capacity of about 0.6 meq g–1. The migration rate of Cs+ in a system ion exchanger-aqueous solution was investigated and correlated with the sorption behaviour of cesium in a system. The leaching rate of cesium from concrete containing zeolite was measured.
Transfer of210Pb and210Po from an uranium mine and mill to the environment was studied by measuring their concentrations in different stages of uranium extraction technology, in waste products from the mill and in environmental waters. A slightly modified radiochemical method was used for210Po and210Pb determination.
A method for210Po and210Pb determination in water samples is described. The nuclides are concentrated, in presence of added208Po and lead carrier, by evaporation. Then the polonium is plated electroless from the acidic solution on a copper planchet and measured by alpha spectrometry.210Pb separation from the other isotopes is based on the solutility of PbSO4 in citrate.210Pb content is determined by measuring the activity of its daughter210Bi. The critical steps in the isolation of lead have been examined and discussed.
The radioactivities of90Sr,137Cs and134Cs have been measured in soil, fodder and milk from the south-western region of Slovenia, Yugoslavia after the Chernobyl accident. Maximal concentrations of Sr-isotopes in samples and the rate of their decrease in a period up to two years after the accident are given. The transfer of radionuclides from soil to grass and from fodder to milk is discussed.
The extraction of plutonium(VI) and plutonium(III) from sulphuric acid by TOA in toluene has been studied as a function of
the acid and tri-octyl amine concentration. A comparison of the extraction properties of plutonium with those of uranium(VI)
and uranium(IV) has been made. It was found that the extraction properties of plutonium(VI) are very similar to those of uranium(VI)
and that TOA is a relatively poor extractant for plutonium(III). Uranium(IV) shows better extraction properties than plutonium(III).
The results obtained are considered in the light of the stabilities of the complexes formed by these elements in the organic
and aqueous phase. A method of separation of both elements by solvent extraction based on changing their oxidation states