dc.identifier.uri |
http://dx.doi.org/10.15488/9762 |
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dc.identifier.uri |
https://www.repo.uni-hannover.de/handle/123456789/9818 |
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dc.contributor.author |
Mühr-Ebert, Elena L.
|
|
dc.contributor.author |
Wagner, Frank
|
|
dc.contributor.author |
Walther, Clemens
|
|
dc.date.accessioned |
2020-04-07T05:59:25Z |
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dc.date.available |
2020-04-07T05:59:25Z |
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dc.date.issued |
2019 |
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dc.identifier.citation |
Mühr-Ebert, E.L.; Wagner, F.; Walther, C.: Speciation of uranium: Compilation of a thermodynamic database and its experimental evaluation using different analytical techniques. In: Applied Geochemistry 100 (2019), S. 213-222. DOI: https://doi.org/10.1016/j.apgeochem.2018.10.006 |
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dc.description.abstract |
Environmental hazards are caused by uranium mining legacies and enhanced radioactivity in utilized groundwater and surface water resources. Knowledge of uranium speciation in these waters is essential for predicting radionuclide migration and for installing effective water purification technology. The validity of the thermodynamic data for the environmental media affected by uranium mining legacies is of utmost importance. Therefore, a comprehensive and consistent database was established according to current knowledge. The uranium data included in the database is based on the NEA TDB (Guillaumont et al., 2003) and is modified or supplemented as necessary e.g. for calcium and magnesium uranyl carbonates. The specific ion interaction theory (Brönsted, 1922) is used to estimate activity constants, which is sufficient for the considered low ionic strengths. The success of this approach was evaluated by comparative experimental investigations and model calculations (PHREEQC (Parkhurst and Appelo, 1999)) for several model systems. The waters differ in pH (2.7–9.8), uranium concentration (10−9-10−4 mol/L) and ionic strength (0.002–0.2 mol/L). We used chemical extraction experiments, ESI-Orbitrap-MS and time-resolved laser-induced fluorescence spectroscopy (TRLFS) to measure the uranium speciation. The latter method is nonintrusive and therefore does not change the chemical composition of the investigated waters. This is very important, because any change of the system under study may also change the speciation. |
eng |
dc.language.iso |
eng |
|
dc.publisher |
London : Elsevier Ltd. |
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dc.relation.ispartofseries |
Applied Geochemistry 100 (2019) |
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dc.rights |
CC BY 4.0 Unported |
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dc.rights.uri |
http://creativecommons.org/licenses/by/4.0/ |
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dc.subject |
Chemical speciation |
eng |
dc.subject |
Database systems |
eng |
dc.subject |
Fluorescence microscopy |
eng |
dc.subject |
Fluorescence spectroscopy |
eng |
dc.subject |
Groundwater |
eng |
dc.subject |
Groundwater resources |
eng |
dc.subject |
Ionic strength |
eng |
dc.subject |
Magnesium compounds |
eng |
dc.subject |
Purification |
eng |
dc.subject |
Surface water resources |
eng |
dc.subject |
Surface waters |
eng |
dc.subject |
Uranium |
eng |
dc.subject |
Uranium compounds |
eng |
dc.subject |
Calcium and magnesiums |
eng |
dc.subject |
Experimental evaluation |
eng |
dc.subject |
Experimental investigations |
eng |
dc.subject |
Radionuclide migration |
eng |
dc.subject |
Specific ion interaction theories |
eng |
dc.subject |
Thermodynamic database |
eng |
dc.subject |
Time-resolved laser-induced fluorescence spectroscopy |
eng |
dc.subject |
Water purification technologies |
eng |
dc.subject |
Chemicals removal (water treatment) |
eng |
dc.subject |
chemical composition |
eng |
dc.subject |
database |
eng |
dc.subject |
experimental study |
eng |
dc.subject |
fluorescence spectroscopy |
eng |
dc.subject |
ionic composition |
eng |
dc.subject |
pollution incidence |
eng |
dc.subject |
radioactivity |
eng |
dc.subject |
radionuclide migration |
eng |
dc.subject |
speciation (chemistry) |
eng |
dc.subject |
thermodynamics |
eng |
dc.subject |
uranium |
eng |
dc.subject.ddc |
550 | Geowissenschaften
|
ger |
dc.title |
Speciation of uranium: Compilation of a thermodynamic database and its experimental evaluation using different analytical techniques |
eng |
dc.type |
Article |
|
dc.type |
Text |
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dc.relation.issn |
0883-2927 |
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dc.relation.doi |
https://doi.org/10.1016/j.apgeochem.2018.10.006 |
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dc.bibliographicCitation.volume |
100 |
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dc.bibliographicCitation.firstPage |
213 |
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dc.bibliographicCitation.lastPage |
222 |
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dc.description.version |
publishedVersion |
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tib.accessRights |
frei zug�nglich |
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