caa a22 4500 37887831X CHVBK 20180305123425.0 cr unu---uuuuu 161128e20031201xx s 000 0 eng 10.1524/ract.91.12.713.23422 doi (NATIONALLICENCE)gruyter-10.1524/ract.91.12.713.23422 Sorption kinetics and impact of temperature, ionic strength and colloid concentration on the adsorption of plutonium-239 by inorganic colloids [Elektronische Daten] [Ningping Lu, Paul W. Reimus, Gary R. Parker, James L. Conca, Inès R. Triay] Plutonium (Pu) is one of the primary actinides of concern for long-term disposal and storage of nuclear waste. Strong sorption of Pu onto colloids of iron oxide, clay, and silica could result in colloid-facilitated transport of this actinide in groundwater systems. However, fundamental data on Pu sorption to colloids is sparse, resulting in large uncertainties in long-term predictions of colloid-facilitated Pu transport. This sparseness of data and the potential to significantly reduce uncertainties in predictive models served as a motivation for this study. The authors investigated the sorption and desorption behaviors of 239Pu(V) on three types of inorganic colloids (hematite, montmorillonite and silica), with adsorption being measured as a function of temperature, ionic strength and colloid concentration for each colloid. Natural ground water collected from Well-13 near Yucca Mountain, Nevada, and synthetic ground water (SYN.J-13) were used in the experiments. The results indicated that the adsorption of 239Pu(V) onto hematite colloids was faster and had a higher partition coefficient (Kp, ml g-1) than onto montmorillonite or silica colloids in both J-13 and SYN.J-13 waters. Temperature did not significantly influence the adsorption of 239Pu(V) onto hematite and silica colloids, but the adsorption of 239Pu(V) onto montmorillonite colloids increased significantly with increasing temperature. While ionic strength did not significantly influence the adsorption of 239Pu(V) onto hematite colloids, an increase in ionic strength decreased the adsorption of 239Pu onto montmorillonite and silica colloids. Adsorption of 239Pu(V) per unit mass of colloid was much higher at low colloid concentrations than at high colloid concentrations. Desorption of 239Pu from 239Pu-loaded colloids was considerably slower than the adsorption process. © 2003 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Lu Ningping aut Reimus Paul W. aut Parker Gary R. aut Conca James L. aut Triay Inès R. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/12/2003(2003-12-01), 713-720 0033-8230 91:12/2003<713 2003 91 ract https://doi.org/10.1524/ract.91.12.713.23422 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.91.12.713.23422 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lu Ningping aut NATIONALLICENCE 700 1- Reimus Paul W. aut NATIONALLICENCE 700 1- Parker Gary R. aut NATIONALLICENCE 700 1- Conca James L. aut NATIONALLICENCE 700 1- Triay Inès R. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/12/2003(2003-12-01), 713-720 0033-8230 91:12/2003<713 2003 91 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter