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. Recently, the adsorptive behaviors of U(VI) [ 4 ], Pb(II) [ 5 ], Cu(II) [ 6 ], Th(IV) [ 7 ] and Ni(II) [ 8 ] were investigated. However, according to our literature survey, few studies were focused on surface complexation modeling of U(VI) sorption on GMZ bentonite as affected by fulvic acid and coexisting FA. An important factor that may influence U(VI) concentration in groundwater is the presence of natural organic matter (NOM). NOM occurs widely in aquatic and terrestrial systems. NOM colloids, such as fulvic acid (FA) colloids, bind very strongly to minerals [ 9

Radiochim. Acta 94, 97–102 (2006) / DOI 10.1524/ract.2006.94.2.97 © by Oldenbourg Wissenschaftsverlag, München Effect of pH and fulvic acid on sorption and complexation of cobalt onto bare and FA bound MX-80 bentonite By D. Xu, D. D. Shao, C. L. Chen, A. P. Ren and X. K. Wang∗ Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, 230031, P.R. China (Received June 13, 2005; accepted in revised form August 12, 2005) Sorption / complexation / Bentonite / Cobalt / pH / Fulvic acid Summary. Bentonite has attracted great interest in nuclear

Radiochim. Acta 94, 429–434 (2006) / DOI 10.1524/ract.2006.94.8.429 © by Oldenbourg Wissenschaftsverlag, München Influence of soil humic acid and fulvic acid on sorption of thorium(IV) on MX-80 bentonite By D. Xu, X. K. Wang∗, C. L. Chen, X. Zhou and X. L. Tan Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, 230031, P.R. China (Received November 29, 2005; accepted in revised form April 15, 2006) Sorption / Bentonite / Thorium / Humic acid / Fulvic acid / SEM Summary. Th(IV) is considered herein as a chemical ana- logue of other

Radiochim. Acta 98, 19–25 (2010) / DOI 10.1524/ract.2010.1680 © by Oldenbourg Wissenschaftsverlag, München Sorption of Eu(III) and Am(III) on attapulgite: effect of pH, ionic strength and fulvic acid By Q. H. Fan1,2, M. L. Zhang1, Y. Y. Zhang1, K. F. Ding1, Z. Q. Yang1 and W. S. Wu1,2,∗ 1 Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 73000, Gansu, P.R. China 2 State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, Gansu, P.R. China (Received March 30, 2009; accepted in final form

Radiochim. Acta 98, 291–299 (2010) / DOI 10.1524/ract.2010.1718 © by Oldenbourg Wissenschaftsverlag, München Effect of humic acid, fulvic acid, pH, ionic strength and temperature on 63Ni(II) sorption to MnO2 By G. Sheng1,2, J. Hu2, H. Jin3, S. Yang2, X. Ren2, J. Li2, Y. Chen1 and X. Wang1,2,∗ 1 School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206, P.R. China 2 Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, P.R. China 3 National

Radiochim. Acta 88, 3452353 (2000)  by Oldenbourg Wissenschaftsverlag, München Uranium(VI) complexation with citric, humic and fulvic acids By John J. Lenhart1,*, †, Stephen E. Cabaniss3, Patrick MacCarthy2 and Bruce D. Honeyman1 1 Colorado School of Mines, Division of Environmental Science and Engineering, Golden, CO 80401, USA 2 Colorado School of Mines, Chemistry and Geochemistry Department, Golden, CO 80401, USA 3 Kent State University, Chemistry Department, Kent, OH 44242, USA (Received August 19, 1999; accepted in final form February 25, 2000) Uranium

. Phys. , 4: 751-756 Böttcher M.E., Thamdrup B., Vennemann T.W., 2001, Oxygen and sulphur isotope fractionation during anaerobic bacterial disproportionation of elemental sulphur , Geochim. Cosmochim. Acta , 65: 1601-1609 Brüchert V., Pratt L.M., 1996, Contemporaneous early diagenetic formation of organic and inorganic sulphur in estuarine sediments from St. Andrew Bay, Florida, USA , Geochim. Cosmochim. Acta , 60: 2325-2332 Brüchert V., 1996, Early diagenesis of sulphur in estuarine sediments: The role of sedimentary humic and fulvic acids , Geochim. Cosmochim

Abstract

In this work, experiments and modeling for the interactions between uranyl ion and TiO2 in the presence of fulvic acid are presented. The results demonstrated that FA is strongly bound to TiO2, and these molecules have a very large effect on the U(VI) sorption, and vice versa. The results also demonstrated that U(VI) sorption to TiO2 in the presence and absence of sorbed FA can be well predicted with the SCD model (surface and complex distribution). According to the model calculations, the nature of the interactions between FA with U(VI) at TiO2 surface is mainly surface complex and electrostatic potential.

Interaction between Monovalent and Multivalent Metals and Fulvic Acids A Streaming Current Detection Study Michael Weis and Fritz H. Frimmel* Engler-Bunte-Institut, Universität Karlsruhe, Richard-Willstätter-Allee 5, D-7500 Karlsruhe D edicated to Prof. Dr. H. P. Fritz on the occasion o f his 60th birthday Z. Naturforsch. 45b, 887-891 (1990); received December 15, 1989 Fulvic Acids, Metal Complexation Capacity, Streaming Current Detection The complexation reaction between metal cations o f different valence states (Al, Bi(III), Cr(III), Fe(III); Ca, Co(II), Cu

Radiochim. Acta 101, 1–6 (2013) / DOI 10.1524/ract.2013.1992 © by Oldenbourg Wissenschaftsverlag, München Complex formation of Np(V) with fulvic acid at tracer metal concentration By K. Müller1,2 and T. Sasaki1,∗ 1 Kyoto University, Department of Nuclear Engineering, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan 2 Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Resource Ecology, P.O. Box 510119, 01314 Dresden, Germany (Received February 14, 2012; accepted in revised form May 12, 2012) (Published online November 19, 2012) Humic substances / Apparent