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Highly Hydrated Associate of Tributyl Phosphate in Dodecane

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Abstract

The hydration and association of tributyl phosphate (TBP) in dodecane were investigated on the basis of the water distribution between aqueous solutions and TBP-dodecane solutions at 298 K. The water distribution data were analyzed as functions of the TBP concentration in the organic phase and the water activity in the aqueous phase. A highly hydrated TBP trimer was found in the organic phase at high TBP concentrations by the data analysis. At [TBP]org,total≤0.02 mol dm-3, no TBP association occurred and only TBP•H2O formed as a unique hydrate. In the range of 0.02 mol dm−3<[TBP]org,totla≤0.3 mol dm-3, a part of the monohydrate dimerized to form (TBP)2(H2O)2. At [TBP]org,total>0.3 mol dm-3, trimerization also occurred at high water activities. The trimer was found to be hydrated with six water molecules, (TBP)3(H2O)6.

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  1. Department of Fuel Cycle Safety Research, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki, 319-11, Japan

    Hirochika Naganawa & Shoichi Tachimori

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  1. Hirochika Naganawa
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  2. Shoichi Tachimori
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Naganawa, H., Tachimori, S. Highly Hydrated Associate of Tributyl Phosphate in Dodecane. ANAL. SCI. 10, 607–613 (1994). https://doi.org/10.2116/analsci.10.607

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  • DOI: https://doi.org/10.2116/analsci.10.607

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