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- W233192896 abstract "Two new redox-active organometallic extractants for the redox-recyclable extraction and recovery (R2ER) of the cationic radionuclides 137Cs+ and 90Sr2+ from aqueous waste simulants, Na[Fe(η5-C5H5)(η5-(3)-1,2-C2B9H9(n-C12H25)2)] (Na+I-) and Na[Fe(η5-C5H5)(η5-(3)-1,2-C2B9H7(n-C12H25)2-9,12-Br2)] (Na+II-), were synthesized and investigated. When diluted with toluene or xylenes, they extracted Cs+ from aqueous waste simulants such as (i) 1 mol L-1 NaOH + 1 mol L-1 NaNO3, (ii) 1 mol L-1 HNO3, and/or (iii) 1 mol L-1 NaCl, with D(Cs) values that ranged from 5 to 20; the corresponding D(Sr) values were ≤0.04. The addition of poly(ethylene glycol) as a co-diluent increased D(Sr) values to as high as 33 but decreased D(Cs) values by a factor of 2−10, depending on conditions. When separated from the raffinate and exposed to air, the extractant-containing organic phase released ≥88% of its radioactivity in the form of a solid precipitate of minimal volume. When a small amount of water was present during this procedure, the extractant-containing organic phase released ≥99% of its radioactivity to the new aqueous phase. When an oxidized dilute extractant was rereduced and used for a second R2ER cycle, the D(Cs) value was unchanged." @default.
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- W233192896 date "1999-06-09" @default.
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- W233192896 title "Design and Use of Redox-Recyclable Organometallic Extractants for the Cationic Radionuclides <sup>137</sup>Cs<sup>+</sup> and <sup>90</sup>Sr<sup>2+</sup> from Waste Solutions" @default.
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- W233192896 doi "https://doi.org/10.1021/es9810585" @default.
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