Solvent extraction of microamounts of cesium into nitrobenzene using ammonium and thallium dicarbollylcobaltates in the presence of 2,3-naphtho-15-crown-5 |
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Authors: | E Makrlík P Vaňura and P Selucky |
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Institution: | (1) Faculty of Applied Sciences, University of West Bohemia, Husova 11, 306 14 Pilsen, Czech Republic;(2) Institute of Chemical Technology, Prague, Technick? 5, 166 28 Prague, Czech Republic;(3) Nuclear Research Institute, 250 68 Řež, Czech Republic |
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Abstract: | Extraction of microamounts of cesium by a nitrobenzene solution of ammonium dicarbollylcobaltate
( \textNH 4 + \textB - ) ( {{\text{NH}}_{ 4}^{ + } {\text{B}}^{ - } }) and thallium dicarbollylcobaltate
( \textTl + \textB - ) ( {{\text{Tl}}^{ + } {\text{B}}^{ - } }) in the presence of 2,3-naphtho-15-crown-5 (N15C5, L) has been investigated. The equilibrium data have been explained assuming
that the complexes
\textML + {\text{ML}}^{ + } and
\textML 2 + {\text{ML}}_{ 2}^{ + }
( \textM + = \textNH4 + ,\textTl + ,\textCs + ) ( {{\text{M}}^{ + } = {\text{NH}}_{4}^{ + } ,{\text{Tl}}^{ + } ,{\text{Cs}}^{ + } } ) are present in the organic phase. The stability constants of the
\textML + {\text{ML}}^{ + } and
\textML2 + {\text{ML}}_{2}^{ + } species
( \textM + = \textNH4 + ,\textTl + ) ( {{\text{M}}^{ + } = {\text{NH}}_{4}^{ + } ,{\text{Tl}}^{ + } }) in nitrobenzene saturated with water have been determined. It was found that the stability of the complex cations
\textML + {\text{ML}}^{ + } and
\textML2 + {\text{ML}}_{2}^{ + }
(\textM + = \textNH4 + ,\textTl + ,\textCs + ; \textL = \textN15\textC5) ({{\text{M}}^{ + } = {\text{NH}}_{4}^{ + } ,{\text{Tl}}^{ + } ,{\text{Cs}}^{ + } ;{\text{L}} = {\text{N}}15{\text{C}}5}) in the mentioned medium increases in the
\textCs + < \textNH4 + < \textTl + {\text{Cs}}^{ + }\,<\, {\text{NH}}_{4}^{ + }\,<\,{\text{Tl}}^{ + } order. |
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Keywords: | |
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