Interactions of radionuclides in solution with ions and with trace concentrations of solid phase
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F. Kepák
Abstract
Interactions of radionuclides in extremely low concentrations were determined by measurement of their apparent self-diffusion coefficients. Formation of trace amounts of hydrolysis products, hydroxides of RuIV, MnIV, FeIII, EuIII and of ionic precipitate of AgI were determined from apparent self-diffusion coefficients. Transition of 85Sr2+ by ion exchange or by coprecipitation into trace amounts of FeIII-hydroxide and MnIV-hydrated oxide was revealed by this method. 85Sr2+ sorbed on trace amounts of FeIII-hydroxide and MnIV-hydrated oxides lost its individual chemical properties. This can negatively affect its separation from solution. Formation of unstable embryos of Ag131I trace precipitate in unsaturated solution at concentration of Ag+ 1 · 10−9 mol · l−1 and 131I−1 · 10−8 mol · l−1 was detected by self-diffusion. Formation of trace amounts of Ag131I led to the decrease of sorption of 131I− on hydrated ferric oxide.
Kurzfassung
Die Wechselwirkung von Radionukliden bei extrem niedrigen Konzentrationen wurde bestimmt durch Messung ihrer scheinbaren (apparenten) Selbstdiffusionskoeffizienten. Die Entstehung der Spurenmengen von Hydrolyseprodukten, Hydrooxiden von RuIV, MnIV, FeIII, EuIII und Ionenausfällung von AgI, wurde mit Hilfe der scheinbaren (apparenten) Selbstdiffusionskoeffizienten bestimmt. Der Übergang von 85Sr2+ durch Ionenaustausch oder durch Mitfällung von FeIII-Hydroxid und MnIV-Oxidhydrat in Spurenmengen wurde durch diese Methode entdeckt. 85Sr2+ sorbiert an Spurenmengen von FeIII-Hydroxid und MnIV-Oxidhydrat verlor seine individuellen chemischen Eigenschaften. Dies kann die Abtrennung aus Lösungen negativ beeinflussen. Die Entstehung von instabilen An-teilen bei der Ag131I Spurenausfällung in ungesättigter Lö-sung bei Konzentrationen von Ag+1 · 10−9 mol · l−1 and 131I−1 · 10−8 mol · l−1 wurde durch Selbstdiffusion nachgewiesen. Die Entstehung von Spurenmengen von Ag131I führte zur Abnahme der Sorption von 131I− an Eisenoxidhydrat.
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Articles in the same Issue
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- Numerical simulation on a HPLWR fuel assembly flow with one revolution of wrapped wire spacers
- Axial-power-shape induced frequency shifts in BWR stability measurements
- Numerical investigation of heat transfer in the vertical annulus between pressure tube and calandria tube of the advanced water cooled reactor
- Uncertainty analysis for fission products transport in CANDU primary heat transport during a severe accident
- Definition of conservative conditions for RIA analysis in the modernized RBMK reactor core
- Assessment of different mechanisms of C-14 production in irradiated graphite of RBMK-1500 reactors
- In-pile measurements of the fission gas pressure and comparison with ROFEM code results
- The time-dependent P1 model for the neutronics of multiplying systems: a review
- Efficiency of reflection coefficients in the isotropic neutron transport equation and computation of the critical-half thicknesses
- Finite differences with exponential filtering in the calculation of reactivity
- Asymptotic solution of critical thickness with direct second kind Chebyshev polynomial approximation in forward and backward scattering
- Interactions of radionuclides in solution with ions and with trace concentrations of solid phase
