Analytical Sciences

Solid-Phase Extraction of Gallium(III) with Hydrophobic 8-Quinolinol Derivatives-impregnated Resin from Aqueous Acidic and Alkaline Solutions

Nahoko HATORI,* Hisanori IMURA,** Akira OHASHI,* and Kousaburo OHASHI*

*Department of Environmental Sciences, Faculty of Science, Ibaraki University, Mito 310-8512, Japan
**Division of Material Sciences, Graduate School of Natural Science & Technology, Kanazawa University, Kanazawa 920-1192, Japan

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 (HO₈Q), 2-methyl-5-octyloxymethyl-8-quinolinol (HMO₈Q), 5-dioctylaminomethyl-8-quinolinol (HN₈Q), 7-bromo-5-octyloxymethyl-8-quinolinol (HBrO₈Q), 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: HBrO₈Q < HEMOQ < HO₈Q < HN₈Q < HMO₈Q at 3 mol l^-1 HCl; HMO₈Q < HO₈Q < HOEHQ < HEMOQ < HN₈Q < HBrO₈Q at pH 0.4; HMO₈Q < HO₈Q ≈ HOEHQ < HN₈Q < HEMOQ at 3 mol l^-1 NaOH.

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