title: Solid-phase extraction of gallium(III) with hydrophobic 8-quinolinol derivatives-impregnated resin from aqueous acidic and alkaline solutions.
abstract: Solid-phase extraction (SPE) of gallium(III) with hydrophobic 8-quinolinol derivatives (HQs)-impregnated resin from aqueous acidic and alkaline solutions has been investigated. The HQs used were 7-(4-ethyl-1-methyloctyl)-8-quinolinol (HEMOQ), 5-octyloxymethyl-8-quinolinol (HO(8)Q), 2-methyl-5-octyloxymethyl-8-quinolinol (HMO(8)Q), 5-dioctylaminomethyl-8-quinolinol (HN(8)Q), 7-bromo-5-octyloxymethyl-8-quinolinol (HBrO(8)Q), and 5-(2-ethylhexyloxymethyl)-8-quinolinol (HOEHQ). Various factors affecting the SPE, such as the substituents of the HQs, HCl and NaOH concentrations in the aqueous phase, the HQ concentration in the resin, and the equilibration time were clarified. The extractability for gallium(III) from the aqueous solution became higher in the following order: HBrO(8)Q < HEMOQ < HO(8)Q < HN(8)Q < HMO(8)Q at 3 mol l(-1) HCl; HMO(8)Q < HO(8)Q < HOEHQ < HEMOQ < HN(8)Q < HBrO(8)Q at pH 0.4; HMO(8)Q < HO(8)Q asymptotically equal to HOEHQ < HN(8)Q < HEMOQ at 3 mol l(-1) NaOH.
authors.affiliation: Department of Environmental Sciences, Faculty of Science, Ibaraki University, Mito 310-8512, Japan.
authors.forename: Nahoko
authors.initials: N
authors.lastname: Hatori
authors.forename: Hisanori
authors.initials: H
authors.lastname: Imura
authors.forename: Akira
authors.initials: A
authors.lastname: Ohashi
authors.forename: Kousaburo
authors.initials: K
authors.lastname: Ohashi