Extraction of alkali metal cations from aqueous solutions by a crown ether carboxylic acid
Extraction of alkali metal cations from aqueous solutions by a crown ether carboxylic acid
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DOI：
10.1021/ac00235a040
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发表时间：
1981-10
影响因子：
7.4
通讯作者：
J. Strzelbicki;R. Bartsch
中科院分区：
文献类型：
--
作者：
J. Strzelbicki;R. Bartsch
本文报道了均二苯并-16-冠-5-氧乙酸在氯仿中对碱金属阳离子的溶剂萃取。的pH值，金属离子的身份和浓度在水相中，和阴离子身份在水相中的金属和络合剂在有机相中的浓度的影响进行了评估为单离子萃取。萃取效率对水相阴离子从氯离子到硫酸根的变化不敏感，这表明在萃取过程中阴离子不会转移到有机相。萃取效率对水相的pH非常敏感。对于竞争性离子萃取，对于pH 6至7，选择性为K > Na > Rb大于或等于Cs > Li，并且Na > K > Rb约为0.对于pH 8至12，= Cs > Li。冠醚羧酸的萃取效率和选择性优于对称二苯并-16-冠-5甲基醚或苯氧乙酸。
Solvent extraction of alkali metal cations from aqueous solutions by sym-dibenzo-16-crown-5-oxyacetic acid in chloroform is reported. Influence of pH, metal ion identity and concentration in the aqueous phase, and anion identity in the aqueous phase upon the concentrations of metal and complexing agent in the organic phase are assessed for single ion extractions. Extraction efficiency is insensitive to changing the aqueous phase anion from chloride to sulfate which demonstrates that the anion is not transferred to the organic phase during extraction. Extraction efficiency is very sensitive to the pH of the aqueous phase. For competitive ion extractions, the selectivity is K > Na > Rb greater than or equal to Cs > Li for pH 6 to 7 and Na > K > Rb approx. = Cs > Li for pH 8 to 12. The crown ether carboxylic acid exhibits extraction efficiencies and selectivities which surpass those of sym-dibenzo-16-crown-5 methyl ether or phenoxyacetic acid.