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Zagana, E.; Obeidat, M.; Külls, C.; Udluft, P. |
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Title |
Chloride, hydrochemical and isotope methods of groundwater recharge estimation in eastern Mediterranean areas: a case study in Jordan |
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2007 |
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Hydrological Processes: An International Journal |
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21 |
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16 |
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2112-2123 |
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John Wiley & Sons, Ltd. Chichester, UK |
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THL @ christoph.kuells @ Zagana2007chloride |
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29 |
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Author |
Zagana, E.; Külls, C.; Udluft, P.; Constantinou, C. |
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Title |
Methods of groundwater recharge estimation in eastern Mediterranean water balance model application in Greece, Cyprus and Jordan |
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Journal Article |
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2007 |
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Hydrological Processes: An International Journal |
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21 |
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18 |
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2405-2414 |
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John Wiley & Sons, Ltd. Chichester, UK |
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THL @ christoph.kuells @ Zagana2007methods |
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30 |
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Zagana, E.; Külls, C.; Udluft, P. |
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Title |
Der Wasserhaushalt des Aliakmonas |
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Journal Article |
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Year |
2000 |
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Vom Wasser |
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94 |
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29-39 |
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THL @ christoph.kuells @ Zagana2000saa |
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34 |
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Voerkelius, S.; Külls, C.; Santiago, M.M.F.; Frischkorn, H.; dos Santos Semrau, L.A.; Heinrichs, G.; Gil, M.M.L. |
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Title |
Investigations on water management and water quality in Picos/PI and Tauá/CE |
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Book Chapter |
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2003 |
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Global change and regional impacts |
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173-184 |
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Springer, Berlin, Heidelberg |
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THL @ christoph.kuells @ Voerkelius2003investigations |
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40 |
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Author |
Udluft, P.; Külls, C. |
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Title |
Mapping the availability and dynamics of groundwater recharge. Part 1: modelling techniques |
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Conference Article |
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Year |
2000 |
Publication |
Proceedings of the Third Congress on Regional Geological Cartography and Information Systems |
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337-340 |
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THL @ christoph.kuells @ Udluft2000mapping |
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64 |
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Udluft, P.; Dünkeloh, A.; Mederer, J.; Külls, C.; Schaller, J. |
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Title |
Re-evaluation of the groundwater resources of Cyprus |
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Report |
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2006 |
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Lefkosia |
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THL @ christoph.kuells @ Udluft2006re |
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66 |
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Tziritis, E.; Aschonitis, V.; Balacco, G.; Daras, P.; Doulgeris, C.; Fidelibus, M.D.; Gaubi, E.; Gueddari, M.; Güler, C.; Hamzaoui, F.; others |
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Title |
MEDSAL Project-Salinization of critical groundwater reserves in coastal Mediterranean areas: Identification, risk assessment and sustainable management with the use of integrated modelling and smart ICT tools |
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2020 |
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EGU General Assembly Conference Abstracts |
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2326 |
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THL @ christoph.kuells @ Tziritis2020medsal |
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43 |
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Tröger, U.; Dias, C.L.; Guillaumon, J.R.; Iritani, M.A.; Külls, C.; Schuler, G. |
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Title |
Remarks and new data about the recharge of the Guarani Aquifer System |
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Conference Article |
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2004 |
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XXXIII IAH Congress, Abstracts, IAH, Mexico |
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THL @ christoph.kuells @ Troeger2004remarks |
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59 |
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Rehm-Berbenni, C.; Druta A.; Åberg, G.; Neguer J.; Külls, C.; Patrizi, G.; Pacha, T.; Kienzle, P.; Bugini, R.; Fiore, M.G. |
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Title |
Isotope Technologies Applied to the Analysis of Ancient Roman Mortars |
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Book Whole |
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2005 |
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European Commission |
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Results of the CRAFT Project EVK4 CT-2001-30004 |
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THL @ christoph.kuells @ |
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73 |
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Author |
Paradis, C.J.; Hoss, K.N.; Meurer, C.E.; Hatami, J.L.; Dangelmayr, M.A.; Tigar, A.D.; Johnson, R.H. |
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Title |
Elucidating mobilization mechanisms of uranium during recharge of river water to contaminated groundwater |
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2022 |
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Journal of Contaminant Hydrology |
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251 |
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Pages |
104076 |
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Keywords |
Desorption, Dissolution, Groundwater, Surface water, Tracer, Uranium |
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Abstract |
The recharge of stream water below the baseflow water table can mobilize groundwater contaminants, particularly redox-sensitive and sorptive metals such as uranium. However, in-situ tracer experiments that simulate the recharge of stream water to uranium-contaminated groundwater are lacking, thus limiting the understanding of the potential mechanisms that control the mobility of uranium at the field scale. In this study, a field tracer test was conducted by injecting 100 gal (379 l) of oxic river water into a nearby suboxic and uranium-contaminated aquifer. The traced river water was monitored for 18 days in the single injection well and in the twelve surrounding observation wells. Mobilization of uranium from the solid to the aqueous phase was not observed during the tracer test despite its pre-test presence being confirmed on the aquifer sediments from lab-based acid leaching. However, strong evidence of oxidative immobilization of iron and manganese was observed during the tracer test and suggested that immobile uranium was likely in its oxidized state as U(VI) on the aquifer sediments; these observations ruled out oxidation of U(IV) to U(VI) as a potential mobilization mechanism. Therefore, desorption of U(VI) appeared to be the predominant potential mobilization mechanism, yet it was clearly not solely dependent on concentration as evident when considering that uranium-poor river water (\textless0.015 mg/L) was recharged to uranium-rich groundwater (≈1 mg/L). It was possible that uranium desorption was limited by the relatively higher pH and lower alkalinity of the river water as compared to the groundwater; both factors favor immobilization. However, it was likely that the immobile uranium was associated with a mineral phase, as opposed to a sorbed phase, thus desorption may not have been possible. The results of this field tracer study successfully ruled out two common mobilization mechanisms of uranium: (1) oxidative dissolution and (2) concentration-dependent desorption and ruled in the importance of advection, dispersion, and the mineral phase of uranium. |
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0169-7722 |
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THL @ christoph.kuells @ paradis_elucidating_2022 |
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135 |
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