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Ivanovich, M.* ; Wolf, M. ; Geyer, S. ; Fritz, P.*

Isotopic characterization of humic colloids and other organic and inorganic dissolved species in selected groundwaters from sand aquifers at Gorleben, Germany.

ACS Symp. Series 651, 220-243 (1996)

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Open Access Green as soon as Postprint is submitted to ZB.

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The aim of this work was to determine the significance of groundwater colloids in far-field radionuclide migration. To this purpose, isotopic data presented in this paper were obtained from several selected Gorleben groundwaters as part of the colloid characterisation programme. The contents of major and minor ions, light isotopes (²H, ³H, ¹³C, ¹⁴C, ¹⁸O and ³⁴S), and the U/Th isotopes were measured. Radiocarbon and ¹³C were measured in dissolved inorganic carbon (DIC), ion the humic acid (HAcolloids) and fulvic acid (FA-solution) fractions of dissolved organic carbon (DOC). The ¹⁸O and ³⁴S were also determined in dissolved sulphate phase. The U/Th isotope measurements were carried out on total and surface solid phases, colloid fraction (1-1000 nm particle size, HA) and solution (<1.5 nm, FA). The ³H data using a piston-flow model have yielded groundwater ages of less than 40a before present (BP) for a near surface groundwaters and much older ages for all other deeper organically-rich Gorleben groundwaters. The ¹⁴C content of DIC is low and probably influenced by strong dilution with mineralised fossil carbon. The resulting high ¹⁴C-model ages (up to 27 ka BP) can only be interpreted as upper limits of the true groundwater ages. The ¹⁴C content of the HA fractions is partly very low or partly below detection limit yielding very high ¹⁴C-model groundwater ages (up to >30 ka BP) whereas, some of the FA fractions contain higher ¹⁴C yielding model groundwater ages more consistent with post-glacial recharge (<12 ka BP). These groundwater ages are consistent with Holocene recharge inferred from the ²H and ¹⁸O isotope data. These differences between the HA and FA fractions are also confirmed by the U/Th isotope ratios suggesting different source/histories of the two organic carbon fractions. Thus, it is possible that the FA fraction has originated mainly from the near-surface (soil) source, while the HA fraction derives mainly from organic matter from older sediments such as lignite lenses or from a mixture of an enhanced input of organically-rich water younger than some 12 ka BP and much older lignite source.

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Publication type Article: Journal article

Document type Scientific Article

Editors Gaffney, J.S.*

Corresponding Author

ISSN (print) / ISBN 0097-6156

Conference Title Humic and Fulvic Acids: Isolation, Structure and Environmental Role

Journal ACS Symposium Series

Quellenangaben Volume: 651, Pages: 220-243

Series ACS Symposium Series

Publisher American Chemical Society (ACS)

Publishing Place Washington, DC

Non-patent literature Publications

Institute(s) Institute of Groundwater Ecology (IGOE)