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- W2016176561 abstract "129 I is one of the more hazardous nuclides occurring in radioactive waste. In the form of I − , its most likely speciation, it is poorly sorbed on most geologic media. Several workers have suggested the use of silver to precipitate I − as the insoluble AgI, in a cemented waste form, or as a “getter”. The efficacy of this procedure is examined by experiment, in conjunction with thermodynamic predictions. The addition of AgNO 3 to Portland cement leads to coprecipitation with C-S-H, with low Ag solubilities (∼ 10 μ mg/L); 2–;3 orders of magnitude lower than predicted (from Ag 2 O). AgI is stable in these matrices, with low aqueous I concentrations (<2 mg/L). In 85% BFS-15% OPC pastes, AgI is unstable due to redox and complexation reactions, with much I − passing into solution; concentrations up to 900 mg/L were observed. It is shown that repository conditions, on closure, are also likely to induce solubilisation of I − from AgI. It is concluded that the use of Ag is unlikely to significantly improve the immobilisation properties of the near field for radioiodine." @default.
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- W2016176561 date "1990-01-01" @default.
- W2016176561 modified "2023-09-23" @default.
- W2016176561 title "The use of silver as a selective precipitant for 129I in radioactive waste management" @default.
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- W2016176561 doi "https://doi.org/10.1016/0956-053x(90)90104-s" @default.
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