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• W1994718512 abstract "Potential human intrusion into the Waste Isolation Pilot Plant (WIPP) might release actinides into the Culebra Dolomite where sorption reactions will affect of radiotoxicity from the repository. Using a limited residence time reactor the authors have measured Ca, Mg, Nd adsorption/exchange as a function of ionic strength, PCO2, and pH at 25°C. By the same approach, but using as input radioactive tracers, adsorption/exchange of Am, Pu, U, and Np on dolomite were measured as a function of ionic strength, PCO2, and pH at 25°C. Metal adsorption is typically favored at high pH. Calcium and Mg adsorb in near-stoichiometric proportions except at high pH. Adsorption of Ca and Mg is diminished at high ionic strengths (e.g., 0.5M NaCl) pointing to association of Na+ with the dolomite surface, and the possibility that Ca and Mg sorb as hydrated, outer-sphere complexes. Sulfate amplifies sorption of Ca and Mg, and possibly Nd as well. Exchange of Nd for surface Ca is favored at high pH, and when Ca levels are low. Exchange for Ca appears to control attachment of actinides to dolomite as well, and high levels of Ca2+ in solution will decrease Kds. At the same time, to the extent that high PCO2s increase Ca2+ levels, Kds will decrease with CO2 levels as well, but only if sorbing actinide-carbonate complexes are not observed to form (Am-carbonate complexes appear to sorb; Pu-complexes might sorb as well. U-carbonate complexation leads to desorption). This indirect CO2 effect is observed primarily at, and above, neutral pH. High NaCl levels do not appear to affect to actinide Kds." @default.
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• W1994718512 date "1999-07-01" @default.
• W1994718512 modified "2023-09-27" @default.
• W1994718512 title "Metal sorption to dolomite surfaces" @default.
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• W1994718512 doi "https://doi.org/10.1016/s0883-2927(98)00085-7" @default.
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