Iodine sequestration using delafossites and layered hydroxides |
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Authors: | Jason D Pless J Benjamin Chwirka James L Krumhansl |
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Institution: | (1) Sandia National Laboratories, P.O. Box 5800, MS 0754, Albuquerque, NM 87185-0754, USA |
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Abstract: | The objective of this document is to report on the early success for sequestering 129I. Sorption coefficients (K
d) for I− and IO3
− onto delafossites, spinels and layered metal hydroxides were measured and compared for their applicability to sequester 129I. The studies were performed using a dilute fluid composition representative of groundwater indigenous to the Yucca mountain
area. Delafossites generally exhibited relatively poor sorption coefficients (<35 mL/g). In contrast, the composition of the
layered hydroxides significantly affects their ability to sorb I. Cu/Al and Cu/Cr layered hydroxide samples exhibit K
d’s greater than 1000 mL/g for both I− and IO3
−. |
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Keywords: | Iodide sequestration Iodate sequestration Hydrotalcites Delafossites |
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