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T. Iwaida, S. Nagasaki, S. Tanaka

Sorption study of strontium onto hydrated cement phases using a sequential desorption method

We studied the sorption behavior of Sr onto calcium-silicate-hydrates (C-S-H), calcium-aluminate-hydrates ettringite (AFt), monosulphate (AFm), and hydrogarnet (C₃AH₆) by applying a sequential desorption method. The results showed that:
- The distribution coefficients (K_d) of Sr sorption onto C-S-H increased with decreasing Ca/Si ratios of C-S-H. This K_d change is explained with the zeta potentials of C-S-H at various Ca/Si ratios and with the change of surface functional group,
- Sr is sorbed on C-S-H through plural sorption forms. The observation that some Sr is desorbed by EDTA and nitric acid suggests that a replacement of Ca with Sr takes place in the C-S-H structure, and
- Sr is structurally incorporated into AFt, AFm, and C₃AH₆.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 88, 08/2000
Pages: 483

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