Complexation of Eu3+ with a polycarboxylate based concrete superplasticizer in chloride media
In this work, we present a complexation study of Eu3+ with a commercial polycarboxylate based concrete superplasticizer Glenium® 51 in NaCl media at low to medium ionic strengths. The complexation is investigated using time-resolved laser fluorescence spectroscopy (TRLFS) at pHm = 5.1 ± 0.1. With th...
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Elsevier
2025-07-01
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| Series: | Results in Chemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211715625003820 |
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| author | Sema Özyagan Raoul E. Gillmeister Thomas Sittel Andrej Skerencak-Frech Petra J. Panak |
| author_facet | Sema Özyagan Raoul E. Gillmeister Thomas Sittel Andrej Skerencak-Frech Petra J. Panak |
| author_sort | Sema Özyagan |
| collection | DOAJ |
| description | In this work, we present a complexation study of Eu3+ with a commercial polycarboxylate based concrete superplasticizer Glenium® 51 in NaCl media at low to medium ionic strengths. The complexation is investigated using time-resolved laser fluorescence spectroscopy (TRLFS) at pHm = 5.1 ± 0.1. With the charge neutralization model, conditional stability constants log K'm were determined for ionic strengths up to Im (NaCl) = 2.47 mol kg−1 H2O−1. Eu3+ only forms one complex with this complexant under these conditions. The conditional stability constants decrease significantly at elevated ionic strengths by almost three orders of magnitude. Thus, the Eu3+-Glenium® 51 complex formation is reduced at high ionic strengths. The determination of the conditional stability constants allows to extrapolate to the stability constant at zero ionic strength by using the specific ion interaction theory (SIT). A logKm0 = 8.54 ± 0.9 has been determined, which highlights the strong complexation properties of the superplasticizer. Moreover, this novel study presents first insights into the interaction of Glenium® 51 with Eu3+ at various ionic strengths. Since Eu3+ is used as a surrogate for trivalent actinides, these results are very important for understanding actinide behavior in cementitious systems present at the geotechnical barrier of a repository in clay rock formations of Northern Germany containing pore and formation waters with elevated ionic strength. |
| format | Article |
| id | doaj-art-b8f745f7b0b24e88a15b70ee5beea4a9 |
| institution | DOAJ |
| issn | 2211-7156 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
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| spelling | doaj-art-b8f745f7b0b24e88a15b70ee5beea4a92025-08-20T03:01:46ZengElsevierResults in Chemistry2211-71562025-07-011610239910.1016/j.rechem.2025.102399Complexation of Eu3+ with a polycarboxylate based concrete superplasticizer in chloride mediaSema Özyagan0Raoul E. Gillmeister1Thomas Sittel2Andrej Skerencak-Frech3Petra J. Panak4Heidelberg University, Institut für Physikalische Chemie, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany; Corresponding author.Heidelberg University, Institut für Physikalische Chemie, Im Neuenheimer Feld 253, 69120 Heidelberg, GermanyKarlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, 76021 Karlsruhe, GermanyKarlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, 76021 Karlsruhe, GermanyHeidelberg University, Institut für Physikalische Chemie, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany; Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, 76021 Karlsruhe, GermanyIn this work, we present a complexation study of Eu3+ with a commercial polycarboxylate based concrete superplasticizer Glenium® 51 in NaCl media at low to medium ionic strengths. The complexation is investigated using time-resolved laser fluorescence spectroscopy (TRLFS) at pHm = 5.1 ± 0.1. With the charge neutralization model, conditional stability constants log K'm were determined for ionic strengths up to Im (NaCl) = 2.47 mol kg−1 H2O−1. Eu3+ only forms one complex with this complexant under these conditions. The conditional stability constants decrease significantly at elevated ionic strengths by almost three orders of magnitude. Thus, the Eu3+-Glenium® 51 complex formation is reduced at high ionic strengths. The determination of the conditional stability constants allows to extrapolate to the stability constant at zero ionic strength by using the specific ion interaction theory (SIT). A logKm0 = 8.54 ± 0.9 has been determined, which highlights the strong complexation properties of the superplasticizer. Moreover, this novel study presents first insights into the interaction of Glenium® 51 with Eu3+ at various ionic strengths. Since Eu3+ is used as a surrogate for trivalent actinides, these results are very important for understanding actinide behavior in cementitious systems present at the geotechnical barrier of a repository in clay rock formations of Northern Germany containing pore and formation waters with elevated ionic strength.http://www.sciencedirect.com/science/article/pii/S2211715625003820Europium(III)Glenium® 51ComplexationStability constant |
| spellingShingle | Sema Özyagan Raoul E. Gillmeister Thomas Sittel Andrej Skerencak-Frech Petra J. Panak Complexation of Eu3+ with a polycarboxylate based concrete superplasticizer in chloride media Results in Chemistry Europium(III) Glenium® 51 Complexation Stability constant |
| title | Complexation of Eu3+ with a polycarboxylate based concrete superplasticizer in chloride media |
| title_full | Complexation of Eu3+ with a polycarboxylate based concrete superplasticizer in chloride media |
| title_fullStr | Complexation of Eu3+ with a polycarboxylate based concrete superplasticizer in chloride media |
| title_full_unstemmed | Complexation of Eu3+ with a polycarboxylate based concrete superplasticizer in chloride media |
| title_short | Complexation of Eu3+ with a polycarboxylate based concrete superplasticizer in chloride media |
| title_sort | complexation of eu3 with a polycarboxylate based concrete superplasticizer in chloride media |
| topic | Europium(III) Glenium® 51 Complexation Stability constant |
| url | http://www.sciencedirect.com/science/article/pii/S2211715625003820 |
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