Studies of Zone Melting. VII. Distribution Coefficients of the p-Nitrophenol-Naphthalene Eutectic System.
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In a zone-melting experiment the effective and equilibrium distribution coefficients of <I>p</I>-nitrophenol in naphthalene have been determined by a method based on a determination of the solute concentration in the terminal one zone length after a single zone pass. The effective distribution coefficient (<I>K</I><SUB>e</SUB>) is determined by<BR><I>K</I><SUB>e</SUB>=\frac2<I>Z</I><SUP>*</SUP>+1\left{1−\frac1<I>Z</I><SUP>*</SUP>−1(\frac<I>C</I><SUB>s</SUB><SUP>*</SUP><I>C</I><SUB>0</SUB>−1)\right},<BR>where <I>C</I><SUB>0</SUB> is the initial solute concentration; <I>C</I><SUB>s</SUB><SUP>*</SUP> is the solute concentration described above and <I>Z</I><SUP>*</SUP>=<I>L</I>⁄<I>l</I>−1⁄2; <I>L</I> and <I>l</I> denote the specimen and zone lengths, respectively. Further, the equilibrium distribution coefficient (<I>K</I><SUB>o</SUB>) is obtained as<BR><I>K</I><SUB>o</SUB>=\frac2(<I>Z</I><SUP>*</SUP>−<I>B</I>)<I>Z</I><SUP>*2</SUP>−1<BR>The constant (<I>B</I>) is related to the equation <I>C</I><SUB>s</SUB><SUP>*</SUP>⁄<I>C</I><SUB>0</SUB>=−<I>AV</I>+<I>B</I>, where <I>V</I> is the zone travel rate and <I>A</I> is also a constant. The obtained values of <I>K</I><SUB>e</SUB> and <I>K</I><SUB>o</SUB> agree with those determined by a method reported previously by the author.
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