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[en] In column experiments, using Gorleben groundwater (GoHy 2227) and Gorleben sand, the migration behaviour of Technetium-99 under deep geological conditions was investigated. Under oxic conditions Tc-99 forms pertechnetate, a highly soluble, anionic aqueous species, that does not sorb significantly on minerals or sediments. However technetium can be removed from solution by reduction of Tc(VII) to Tc(IV), when suitable conditions are met: a precipitate TcO2.nH2O with a low solubility is assumed to be formed. However in presence of organic matter, the solubility can be enhanced because soluble Tc(IV) species associate with mobile humic substances. The migration behaviour of these Tc - Humic Substance complexes in Gorleben Sand was investigated. (orig.)
Source
Buckau, G. (ed.); Forschungszentrum Karlsruhe GmbH Technik und Umwelt (Germany). Inst. fuer Nukleare Entsorgungstechnik. Funding organisation: European Union (EU), Brussels (Belgium); 398 p; ISSN 0947-8620; 
; Oct 2000; p. 239-250; Available from TIB Hannover: ZA 5141(6524)
; Oct 2000; p. 239-250; Available from TIB Hannover: ZA 5141(6524)