Substoichiometric ion-pair extraction and determination of barium(II) with macrocyclic crown ether and cryptand

✍ Scribed by Tomoko Fukaya; Hisanori Imura; Nobuo Suzuki

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 547 KB
• Volume: 272
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)80580-e

✦ Synopsis

Barmm(II) IS extracted wth macrocycbc bgands (18~crown-6 or cryptand-2 2) m various orgamc solvents as the Ion pan wth plcrate Ion The extra&on wth both hgands increased m the order benzene < 1,2dlchloroethane < mtrobenzene Barmm(II) 1s substoxhmmetncally extracted mto 1,Zdlchloroethane or 1,2-dlchloroethane-mtrobenzene (1 + 1) wth (0.5-l) X 10e4 M 18-crown-6 or cryptand-2 2 m the presence of (l-2) X lo-' M picrate at pH 4-10 or 7-11, respectwely The ll-crown -6 system was supenor to the cryptand-2 2 system m selectmty toward other alkalme earth and alkah metals The substolchlometnc process combmed wth isotope ddutlon was successfully apphed to the accurate detemunatlon of barmm m a Y-Ba-Cu-0 supexconductmg omde ceramic &ywor& Isotope ddutlon methods,