Sorption of technecium and its analogue rhenium on bentonite materials under aerobic conditions

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Sorption of technecium and its analogue rhenium on bentonite materials under aerobic conditions

Popis výsledku v původním jazyce

The uptake o technetium on bentonite materials has been studied from the point of view of characterization of long-term radioactive elements behavior in nuclear waste repository. Bentonite R (locality Rokle, Czech Republic) and two types of model groundwater (granitic and bentonite) were selected for the sorption experiments. It is generally known that bentonite materials show an excellent cation-exchange capacity and, on the other hand, a poor uptake of anions. Technetium occurs under aerobic conditions in its most stable oxidation state (+VII) as pertechnetate, which makes a question of its sorption on bentonites more complex, when compared with e.g. Cs+ or Sr2+. To increase the Kd balues for technetium sorption on bentonites, it is necessary to carry out the experiments under anaerobic conditions in the presence of reducing agent, which es capable to lower the oxidation state of technecium which enables its successfull immobilization. The aim of our research has been to find out the

Název v anglickém jazyce

Sorption of technecium and its analogue rhenium on bentonite materials under aerobic conditions

Popis výsledku anglicky

The uptake o technetium on bentonite materials has been studied from the point of view of characterization of long-term radioactive elements behavior in nuclear waste repository. Bentonite R (locality Rokle, Czech Republic) and two types of model groundwater (granitic and bentonite) were selected for the sorption experiments. It is generally known that bentonite materials show an excellent cation-exchange capacity and, on the other hand, a poor uptake of anions. Technetium occurs under aerobic conditions in its most stable oxidation state (+VII) as pertechnetate, which makes a question of its sorption on bentonites more complex, when compared with e.g. Cs+ or Sr2+. To increase the Kd balues for technetium sorption on bentonites, it is necessary to carry out the experiments under anaerobic conditions in the presence of reducing agent, which es capable to lower the oxidation state of technecium which enables its successfull immobilization. The aim of our research has been to find out the

Druh

A - Audiovizuální tvorba

CEP obor

CB - Analytická chemie, separace

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2003

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

ISBN

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Název nakladatele resp. objednatele

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