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Interactions of radionuclides in solution with ions and with trace concentrations of solid phase

Wechselwirkungen von Radionukliden in Lösung mit Ionen und mit Spurenkonzentrationen fester Phase
F. Kepák
From the journal Kerntechnik

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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Received: 2009-10-25
Published Online: 2013-04-05
Published in Print: 2010-08-01

© 2010, Carl Hanser Verlag, München