Effects of temperature on the solvent extraction of zinc and cadmium complexes with 8-quinolinol and 2-methyl-8-quinolinol into 1, 1, 2, 2-tetrachloroethane, 1-octanol, and p-xylene.
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The effects of temperature on the extraction of zinc(II) and cadmium(II) complexes with 8-quinolinol (HQ) and 2-methyl-8-quinolinol (HR) into three different types of organic solvents whose boiling points are relatively high were studied. 1) In the case of 1,1,2,2-tetrachloroethane (TCE), the extraction equilibrium can be written as follows (except for that of zinc with 2-methyl-8-quinolinol):<BR>2M<SUP>2+</SUP>+6HQ<SUB>(o)</SUB>+X<SUP>−</SUP>\rightleftarrowsM<SUB>2</SUB>Q<SUB>3</SUB>(HQ)<SUB>3</SUB><SUP>+</SUP><SUB>(o)</SUB>+X<SUP>−</SUP><SUB>(o)</SUB>+3H<SUP>+</SUP>,<BR>where X<SUP>−</SUP> refers to various inorganic anions. An ion-pair of the binuclear complex (complex ion pair) dissociates into a complex cation and an inorganic anion in the organic phase. The distribution ratios decrease remarkably with an increase in temperature. 2) In the 1-octanol (S) extraction system, zinc and cadmium are extracted as solvent-adducts, such as MQ<SUB>2</SUB>·S<SUB>2</SUB>. The distribution ratios are almost constant with a change in temperature. 3) In the <I>p</I>-xylene extraction system, a hydrated metal complex, MQ<SUB>2</SUB>·2H<SUB>2</SUB>2H<SUB>2</SUB>O, may precipitate and be deposited at the interface of both phases, except for the extraction of zinc with 2-methyl-8-quinolinol. 4) The zinc complexes of 2-methyl-8-quinolinol are extracted into TCE and <I>p</I>-xylene as anhydrous complexes, such as MR<SUB>2</SUB>. The distribution ratios increase with an increase in temperature. Moreover, zinc can be separated from cadmium at high temperatures using 2-methyl-8-quinolinol and TCE.
- 公益社団法人 日本化学会の論文
著者
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Yamada Etsu
Center For Environmental Science Kyoto Institute Of Technology
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Sohrin Yoshiki
Institute For Chemical Research Kyoto University
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Nakayama Eiichiro
Research Center For Instrumental Analysis Faculty Of Science Kyoto University
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Isshiki Kenji
Faculty of Home Economics, Kouchi Women's University
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Karatani Hajime
Faculty of Textile Science, Kyoto Institute of Technology
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