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• W2040949216 startingPage "1765" @default.
• W2040949216 abstract "Perrhenate (ReO4-), a nonradioactive surrogate for pertechnetate (99TcO4-), was partitioned during precipitation and aging of iron and aluminum oxyhydroxide solids from aqueous simulants of high-level nuclear waste stored at Hanford, WA. Neutralization of acidic metal nitrate solutions (Al/Fe mole ratio 0.25 and 13.5; 40 ppm Re) to a final pH > 13, followed by aging at 90 degrees C for up to 18 weeks, resulted in substantial amounts of reversibly sorbed Re (approximately 1-10 ppm). Irreversibly sorbed Re increased in the Fe-dominated system with aging, reaching a final value of approximately 83 ppb after 168 h, in a mixture of hematite with minor goethite. Irreversibly sorbed Re in the Al-dominated system generally decreased with time to approximately 30 ppb after 18 weeks in solids dominated by boehmite. Increasing the total amount of Re to 1000 ppm increased the extent of irreversible sorption. The presence of 100 ppm Si prevented transformation of and irreversible Re uptake by ferrihydrite in Fe-dominated systems. In Al-dominated systems, 200 ppm Ni prevented hematite formation but did not affect perrhenate uptake. Results suggest that 5% of the 99Tc inventory in the Hanford waste tanks may be associated with the sludges, and approximately 0.5% incorporated into the solids under oxidizing conditions." @default.
• W2040949216 created "2016-06-24" @default.
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• W2040949216 date "2004-02-05" @default.
• W2040949216 modified "2023-10-08" @default.
• W2040949216 title "Perrhenate Uptake by Iron and Aluminum Oxyhydroxides: An Analogue for Pertechnetate Incorporation in Hanford Waste Tank Sludges" @default.
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• W2040949216 doi "https://doi.org/10.1021/es0348795" @default.
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