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Pengchu Zhang, J.L. Krumhansl, P.V. Brady

Boehmite sorbs perrhenate and pertechnetate

Boehmite and Al-oxyhydroxide gels sorb ReO₄^-, a non-radioactive analogue of TcO₄^- from NaNO₃ solutions. Sorption appears to be substantially electrostatic (though there appears to be a specific preference for ReO₄^- over NO₃^-) and is most effective at pH < 8. Measured K_d´s lie between 5 and 105 ml g^-1, depending on the solid, pH, and ionic strength. ReO₄^- and TcO₄^- are both partially removed from high pH Hanford-type acid waste simulants upon neutralization and formation of Al-rich sludges. We therefore propose that sequestration of Tc by boehmite limits dissolved Tc levels in the near and sub-surface environment and for that purpose boehmite might be relied on as a backfill, or reactive barrier, to limit environmental transport of Tc.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 88, 06/2000
Pages: 369

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