979 resultados para Nicephorus II, Byzantine Emperor, 912 ca.-969.


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t. 2, vyp. 3. Vizantīĭskai︠a︡ povi︠e︡stʹ ob ubīenīi Imperatora Nikifora Foki v starinnom bolgarskom pereskazi︠e︡.

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The extraction of zinc(II) from an aqueous chloride medium has been studied using mixtures of sec-nonylphenoxy acetic acid (CA-100) and bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex 272). The results demonstrate that zinc ion is extracted into heptane as ZnA(2).2HA with CA-100, ZnL2.2HL with Cyanex 272, and ZnA(2)L(2)H(2) with synergistic mixture. The equilibrium constants of the these species have been calculated and extraction mechanisms have been proposed. Thermodynamic parameters of the extraction process were determined by the temperature coefficient of extractability. The synergistic system enhances the extraction efficiency of zinc(II) and also improves the selectivity between zinc(II) and cadmium(II).

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Includes bibliographical references.

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Mode of access: Internet.

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Wydział Teologiczny: Zakład Teologii Fundamentalnej i Ekumenicznej

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Mode of access: Internet.

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Added half t.p., title in Greek.

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Preface signed: L. W. Makovski.

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Includes index.