Basic studies for the incorporation of uranium in sediments [Elektronische Ressource] / vorgelegt von Margarita Koroleva

INAUGURAL - DISSERTATION zur Erlangung der Doktorwürde der Naturwissenschaftlich-Mathematischen Gesamtfakultät der Ruprecht-Karls-Universität Heidelberg vorgelegt von Margarita Koroleva aus Moskau, Russland Diplom Geologie-Hydrogeologie Fahbereich „Hydrogeologie und Ingenieurgeologie“ Moskauer Staatliche Lomonosov-Universität Magister der Geologie Moskauer Staatliche Lomonosov-Universität Tag der mündlichen Prüfung: 13.06.2005 Thema: Basic studies for the incorporation of uranium in sediments Gutachter: Prof. Dr. Augusto Mangini Prof. Dr. Margot Isenbeck-Schröter Abstract Uranium migration in natural aqueous systems is an ongoing concern in environmental research. Investigation on sorption interactions with soil, sediments and rocks are important to understand uranium mobility, in order to correct U/Th dating methods in open systems. Uranium immobilization is possible due to reduction U(VI) to U(IV), adsorption or co-precipitation. Under oxidizing environmental conditions, uranium typically occurs in the hexavalent 2+form as the mobile, aqueous uranyl ion (UO ). Moreover, depending from environmental 22- 4-conditions, uranium forms carbonate complex such as UO (CO ) or UO (CO ) .