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- W1995128519 abstract "Barium(II) is extracted with macrocyclic ligands (18-crown-6 or cryptand-2.2.2) in various organic solvents as the ion pair with picrate ion. The extraction with both ligands increased in the order benzene < 1,2-dichloroethane < nitrobenzene. Barium(II) is substoichiometrically extracted into 1,2-dichloroethane or 1,2-dichloroethane-nitrobenzene (1 + 1) with (0.5–1) × 10−4 M 18-crown-6 or cryptand-2.2.2 in the presence of (1–2) × 10−2 M picrate at pH 4–10 or 7–11, respectively. The 18-crown-6 system was superior to the cryptand-2.2.2 system in selectivity toward other alkaline earth and alkali metals. The substoichiometric process combined with isotope dilution was successfully applied to the accurate determination of barium in a Y-Ba-Cu-O superconducting oxide ceramic." @default.
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- W1995128519 date "1993-02-01" @default.
- W1995128519 modified "2023-10-07" @default.
- W1995128519 title "Substoichiometric ion-pair extraction and determination of barium(II) with macrocyclic crown ether and cryptand" @default.
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- W1995128519 doi "https://doi.org/10.1016/0003-2670(93)80580-e" @default.
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