Published January 1986 | Version v1
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Chemical behaviour of Pu and Am: Hydrolysis reaction in brine solutions, carbonate complexation, α-radiolysis, humate complexation and speciation

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Description

The chemical behaviour of transuranic elements (Pu and Am) has been investigated in saline solution of different NaCl concentrations in the near neutral pH range. Important reactions considered are hydrolysis, carbonate complexation, redox reaction, alpha-radiolysis, colloid generation and humate complexation. Hydrolysis reactions are studied for Pu(VI) in 3.6 M NaCl and for Am(III) in 0.1 M and 0.6 M NaCl solution, whereas carbonate complexation of Pu(IV) and Am(III) is investigated in HCO3-/CO32- solution of varying pH. Consequences of alpha-radiolysis in NaCl solution are thoroughly analysed as for the Eh change due to Cl- oxidation and the oxidation of Pu(IV) and Am(III). In groundwaters colloid generation of Am(III), particularly pseudocolloids, is characterized and correlated with the concentration of humic substances. Humate complexation under discussion deals mainly with the stabilization of Am(III) in a given groundwater through its colloid generation. (orig.)

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MF available from INIS under the Report Number.

Abstract (German)

Das chemische Verhalten der Aktinoide (Pu und Am) wurde in neutralem pH-Bereich in salzhaltigen Loesungen unterschiedlicher NaCl-Konzentrationen untersucht. Grundlegende Reaktionen, die studiert wurden, sind Hydrolyse, Carbonatkomplexierung, Redoxreaktionen, alpha-Radiolyse, Kolloidbildung und Humatkomplexierung. Hydrolysereaktionen von Pu(VI) in 3.6 M NaCl und Am(III) in 0.1 und 0.6 M NaCl-Loesungen, sowie die Carbonatkomplexierung von Pu(IV) und Am(III) in HCO3-/CO32--Loesungen bei verschiedenen pH-Werten wurden untersucht. Die alpha-Radiolyse in NaCl-Loesungen wurde bezueglich Eh-Wert-Aenderung, hervorgerufen durch Cl--Oxidation und Oxidation von Pu(IV) und Am(III), systematisch analysiert. In Grundwaessern wurde die Kolloidbildung von Am(III), insbesondere die Pseudo-Kolloidbildung, charakterisiert und mit der Konzentration der Huminstoffe in Bezug gesetzt. Die hier beschriebene Humatkomplexierung behandelt hauptsaechlich die Stabilisierung von Am(III) in einem gegebenen Grundwasser durch Kolloidbildung. (orig.)

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Additional titles

Original title (German)
Chemisches Verhalten von Pu und Am: Hydrolysereaktionen in Salzloesungen, Carbonatkomplexierung, α-Radiolyse, Huminsaeurekomplexe und Speciation

Publishing Information

Imprint Pagination
120 p.
Report number
RCM--00286

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
17076605
Subject category
S38: RADIATION CHEMISTRY, RADIOCHEMISTRY AND NUCLEAR CHEMISTRY; S38: RADIATION CHEMISTRY, RADIOCHEMISTRY AND NUCLEAR CHEMISTRY;
Descriptors DEI
ABSORPTION SPECTROSCOPY; ALPHA DECAY; AMERICIUM; AMERICIUM COMPLEXES; AMERICIUM COMPOUNDS; CARBONATES; CHEMICAL REACTIONS; COMPUTER CALCULATIONS; GROUND WATER; HUMIC ACIDS; HYDROLYSIS; OXIDATION; PH VALUE; PHOTOACOUSTIC SPECTROSCOPY; PLUTONIUM; PLUTONIUM COMPLEXES; PLUTONIUM COMPOUNDS; RADIOCOLLOIDS; RADIOLYSIS; REDUCTION; SODIUM CHLORIDES; SOLUBILITY; ULTRACENTRIFUGATION; ULTRAFILTRATION; VALENCE
Descriptors DEC
ACTINIDE COMPLEXES; ACTINIDE COMPOUNDS; ACTINIDES; ALKALI METAL COMPOUNDS; CARBON COMPOUNDS; CENTRIFUGATION; CHEMICAL RADIATION EFFECTS; CHLORIDES; CHLORINE COMPOUNDS; COLLOIDS; COMPLEXES; DECAY; DECOMPOSITION; DISPERSIONS; ELEMENTS; FILTRATION; HALIDES; HALOGEN COMPOUNDS; HYDROGEN COMPOUNDS; METALS; NUCLEAR DECAY; ORGANIC ACIDS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; POLAR SOLVENTS; RADIATION EFFECTS; SEPARATION PROCESSES; SODIUM COMPOUNDS; SOLVENTS; SOLVOLYSIS; SPECTROSCOPY; TRANSPLUTONIUM COMPOUNDS; TRANSPLUTONIUM ELEMENTS; TRANSURANIUM COMPLEXES; TRANSURANIUM COMPOUNDS; TRANSURANIUM ELEMENTS; WATER

Optional Information

Contract/Grant/Project number
Contract KWA 5506